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1
Gibigaye, Adam Boukary Nagnimi Idrissou Bio Imorou. "Les aspects socio-economiques des champs fourragers du projet promotion élevage Atacora cas des sous-préfectures de Kouande et Ouassa-Pehunco /." [Benin] : Université nationale du Bénin, 1991. http://catalog.hathitrust.org/api/volumes/oclc/37686716.html.
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Brown, Peter Robert, and n/a. "Pasture response following rabbit control on grazing land." University of Canberra. Resource & Environmental Science, 1993. http://erl.canberra.edu.au./public/adt-AUC20061113.144813.
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The experiments described in this thesis were designed to assess changes in pasture
dynamics (biomass and species composition of pasture) of grazing land on the Southern
Tablelands of ACT and NSW, after 16 combinations of rabbit control treatments had been
applied. The rabbit control performed by CSIRO Division of Wildlife and Ecology
consisted of all combinations of presence-absence of Poisoning (using sodium
monofluoroacetate, 1080: POIS), Ripping (ripping warrens using a tractor fitted with
ripping tynes: RIP), Fumigation (pressure fumigation using chloropicrin: FUM) and
repeated follow-up fumigation (using phostoxin pellets one, six and eighteen months after
completion of the initial treatment: ANN). The pasture was assessed before treatments
were applied, and every six months after rabbit control treatments. Treatment
combinations were assigned randomly in a 24 factorial design on a total of 32 sites.
There was a significant increase of pasture biomass at the RIP+ANN treatment at
post-treatment sample 5. The analysis of covariance did not detect any other significant
increase or decrease of pasture biomass for any rabbit control treatment, at any posttreatment
sample.
A significant increase of grass species occurred for the treatments of
POIS+RIP+FUM, POIS and RIP+ANN for the post-treatment samples of 1, 3 and 5
respectively. There was a significant increase of thistles at the rabbit control treatments of
POIS+RIP+FUM+ANN (post-treatment sample 1), RIP, ANN, RIP+FUM,
RIP+FUM+ANN and POIS+RIP+FUM+ANN (post-treatment sample 3) and RIP and
FUM+ANN (post-treatment sample 5). A significant increase of weeds occurred at FUM
(post-treatment sample 3) and at FUM+ANN (post-treatment sample 5). No significant
changes in the amount of herbs or legumes was apparent for any rabbit control treatment or
post-treatment sample. There were no significant decreases for any species group. Except
for the significant results for post-treatment sample 1, all significant increases of biomass
for any species group occurred during spring (post-treatment sample 3 and 5) which
suggests a growth phase during spring then subsequent dieback (particularly for thistles and
weeds), as any change was not detected in the following autumn sample. No strong trend
is evident for any particular rabbit control treatments, or any combination of treatments.
Analysis of covariance revealed that the rabbit control treatment of RIP+ANN
showed significant increases in both total biomass of pasture and grass biomass during
post-treatment sample 5. This treatment reduced the number of active entrances the most.
Significant positive correlations were found between pasture biomass (total) with
grass, herb, legume, thistle and weed species groups. Significant negative correlations
between grass biomass and the number of active entrances were found when the rabbit
control had been highly effective in reducing the number of active entrances. When rabbit
control had not been very successful, there was a significant positive but low correlation
with the number of active entrances. There was no significant relationship between the
number of active entrances with the weight of rabbit dung pellets. It is reasoned that they
are different measures of rabbit abundance. More rabbit dung pellets were found closer to
the warren than further away from the warren, but there was no correlation between rabbit
dung and pasture biomass.
Rainfall was above average for most of the experiment, biomass increased
accordingly, and rabbit control was highly successful. The resulting changes in the pasture
were difficult to detect, although some increases in species composition groups occurred.
It is reasoned that the changes observed are partly attributable to seasonal conditions, and
to high rainfall. Grazing by domestic animals, sheep and cattle, had been found to be
consistent throughout the experiment.
3
Fernandez, de la Pradilla Villar Jose Ignacio. "Land use and population regulation vole dynamics in a grazing experiment /." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=62156.
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Nash, David. "Phosphorus transfer from land to water in pasture-based grazing systems /." Connect to thesis, 2002. http://eprints.unimelb.edu.au/archive/00000752.
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Straughton, Eleanor Anne. "Common grazing in the Northern Uplands : land, society, governance, since circa 1800." Thesis, Lancaster University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428652.
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Lipschutz, Maia Lynn. "Effects of drought and grazing on land bird populations in South Texas." Thesis, Texas A&M University - Kingsville, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10129021.
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Breeding bird surveys were conducted on 7 properties belonging to 2 ranches in South Texas. Using these data I calculated temporal trends, and tested the effects of total May–April precipitation and cattle stocking rate on avian abundance. Trends were calculated for each ranch, the East Foundation and King Ranch, individually due to different range and wildlife management practices. Total avian abundance increased significantly on the 3 East Foundation properties between 2008 and 2015. During 39 breeding bird surveys, 16,441 individual birds of 88 species were recorded. Non-breeding bird surveys were also conducted on East Foundation properties, an increasing trend in total avian abundance was also calculated from these data. Total breeding bird abundance was stable on the 4 King Ranch properties between 2005 and 2013. A total of 19,162 individual birds of 87 species were recorded during 40 breeding bird surveys. The combined effect of livestock use and precipitation had a significant effect on total avian abundance on all King Ranch properties, and on the abundance of some individual species and groups.
7
Gross, Kathy Lynn. "Nutritional status of beef cows grazing reclaimed strip mined pastures." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/90930.
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A series of four trials over the grazing season were conducted to evaluate the nutritional status of beef cows grazing reclaimed strip-mined pastures in southwestern, Virginia. Blood samples, esophageal fistula forage samples and hand plucked forage samples were taken in each trial. An external marker, Ytterbium, and an internal marker, indigestible neutral detergent fiber (INDF) were used to estimate organic matter intake, fecal output and digestibility. In addition to samples taken during the trials, blood samples and hand plucked forage samples were taken monthly for 11 mo prior to the trial period. In late summer esophageal masticate samples had a low fiber fraction (ADF and NDF), high crude protein and total nonstructural carbohydrates (TNC) which contributed to a high organic matter digestibility. Hand plucked forage samples had higher TNC than esophageal masticate samples. Organic matter digestibility predicted by the internal marker was highest in late summer 61.6%, similar in spring and late fall, and lowest in mid-summer, 52.6% (p < .01). Fecal output was highest in mid-summer and lowest in spring (p < .05). Estimated intake was not significantly different in any of the trials. Although data was variable, forage quality was higher in May, June, October and November samplings, as indicated by highest CP, TNC, and lower NDF and ADF values, compared with July and August data when forage quality was lowest. Packed cell volume, BUN and serum P and Mg concentrations fell within normal ranges for beef cattle. Low BUN values were observed in spring and late fall which corresponded to low crude protein values observed in the esophageal masticate samples for the same trials. Serum Cu was on the low end of normal values in the late spring and decreased to .6 ppm by late fall. Serum K levels were above the expected values for beef cattle. Serum Na concentrations were lower than normal with lowest values observed throughout spring and summer months.M.S.
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Dahlström, Anna. "Betesmarker, djurantal och betestryck 1620-1850 : naturvårdsaspekter på historisk beteshävd i Syd- och Mellansverige /." Uppsala : Department of Economics, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200695.pdf.
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Bloor, Marcus. "Review of current vegetation monitoring on privately protected land under ongoing economic use (grazing)." Thesis, University of Canterbury. School of Forestry, 2009. http://hdl.handle.net/10092/3681.
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There has been a noticeable shift in focus in biodiversity research in New Zealand over recent decades. Research has traditionally focused on biodiversity protection on the public estate, which was comprised primarily of ecosystems with lower productive potential (generally over 500m asl). Private lands generally have higher production potential and are often used for intensive cultivation and agricultural practices. They still however have significant potential for protecting biodiversity values. One of the key tools for protecting biodiversity values on privately owned lands in the Canterbury region are through legally binding QEII open space covenants and there is significant potential through industry certifications. QEII covenants are placed on the land in perpetuity and provide legally binding protection for biodiversity or landscape values within the covenant. This protection is voluntary and allows the land owner to continue to use the land for economic benefit providing it does not prove detrimental to biodiversity through monitoring outcomes. Case studies of QEII covenants that contain grazing clauses in the Canterbury region were used to determine what values are present and what monitoring is occurring in the field within these ecosystems. Photopoints and informal visual monitoring were the primary methods used by the QEII representatives to monitor vegetation in all of the covenants. Monitoring forms a critical feedback for all biodiversity protection. It is especially important to have an accurate feedback on vegetation condition and change from monitoring on properties that are grazed. Monitoring needs to be capable of providing sufficient information on vegetation change on these sites so that the most suitable grazing levels can be obtained by land managers. This thesis focuses on monitoring methods to ensure that this feedback is suitable and that the methods are cost effective. Current vegetation monitoring techniques were reviewed to determine which methods would be most suited to monitoring in these ecosystems where resources are tightly restricted and observers may not have existing skills and experience in monitoring these ecosystems. Methods reviewed were quadrats, transects, height-frequencies, photopoints, needle point, biomass, tagged plants, visual rank and remote sensing. Each method is described and then assessed on its suitability for monitoring tussock shrublands, with cost effectiveness being an important criterion. Of these methods quadrats, transects and height-frequencies were the most robust but also the most intensive and least cost effective methods. Visual rank, needle point and photopoints were the most cost effective, but are generally suited to monitoring single objectives. In most cases a combination of methods would be ideal to suit the objectives of the monitoring. QEII photopoint monitoring should follow guidelines more closely and include more complimentary information with their photographs. Clear monitoring objectives should be developed for every covenant that is grazed and these need to be determined before it is possible to accurately select appropriate monitoring methods. These objectives will also provide the monitoring program with more structure and direction. If possible a detailed management plan for each grazed covenant would be beneficial for values present. QEII are in a unique position, where they have the potential to develop a data base of biodiversity information for private land and contribute to other projects like the National Vegetation Survey (NVS).
10
Johnston, Michael Rhodes. "Phosphorus Losses From Simulated Dairy Land Uses of Management Intensive Grazing and Concentrated Animal Feeding Operations." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/35321.
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Dairy grazing systems have been promoted as an environmentally friendly alternative to concentrated animal feeding operations (CAFOs). However, questions remain regarding the amount of phosphorus (P) loss from pasture-based dairies. Therefore, the goal of this study was to quantify P losses via runoff from grazing dairy systems and CAFO hay production. Four land use treatments were simulated on runoff release plots planted in two forage treatments. Land use treatments were management intensive grazing (MIG) and CAFO hay production to which manure was applied; grazing and CAFO hay production without manure application served as controls. The forage treatments were orchardgrass (Dactylis glomerata) and broad-leafed forage (buckhorn plantain [Plantago lanceolata], red clover [Trifolium pretense], and alfalfa [Medicago sativa]). The four land use treatments and two forage treatments had four replications for a total of 32 (4 land use treatments e n2 forage treatments e n ¤ nreplications) runoff release plots. Thirty minutes of runoff was collected from each runoff release plot during six rainfall simulation series. Grab samples of runoff were collected and analyzed for dissolved reactive phosphorus, total phosphorus, and total suspended solids. Particulate P (PP) was determined indirectly by subtracting dissolved reactive P (DRP) from total P (TP). No distinction was observed between DRP concentrations from simulated MIG plots and simulated CAFO plots for the duration of the study. However, a clear divergence of TP concentrations from CAFO hay plots with manure from all other land uses was observed during simulation series 1. DRP concentrations for all land uses were fairly consistent for the duration of the study with the exception of simulation series 2. All land uses had DRP concentrations that would be considered of concern (> 1.0 ppm DRP) by the US-EPA during simulation series 4 and 5. The elevated TP concentrations and mass losses from CAFO hay plots with manure were primarily due to PP losses. Thus, it was concluded that MIG has less potential for P loss than CAFO hay production. Broad-leafed forage had significantly higher DRP, PP, and TP losses than orchardgrass on CAFO hay with manure. However, no significant difference was found between forage types on MIG plots. Thus, either forage could be planted in grazing land without a significant difference in P losses.Master of Science
11
Neilson, Roy. "Trophic inter-relationships between soil invertebrates and plants investigated using stable isotope natural abundances." Thesis, University of Dundee, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327546.
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Loftus, Mortimer C. P. "The ecology and management of upland vegetation in the Wicklow Mountains." Thesis, University of Ulster, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242007.
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Musgrove, Nicholas James. "Land use and vegetation change on the Long Mynd." Thesis, University of Wolverhampton, 2009. http://hdl.handle.net/2436/84479.
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The plant communities of the Long Mynd plateau are the culmination of over 3000 years of human intervention that largely deforested the uplands, and subsequently maintained the generally treeless heath and grassland communities now extant. The capacity of these communities to respond to directional change is well known, indeed the traditional mode of heathland management, burning, depends on the regenerative capacity of the target species, generally heather (Calluna vulgaris), for its success. However, changes in post WW2 stocking practice; the loss of ponies followed by an increase in the numbers of sheep and a change to them being overwintered on the hill, led to excessive grazing and damage to the heath. This coincided with the spread over the hill by bracken (Pteridium aquilinum) and other changes in the distribution and nature of the vegetation. A sequence of vegetation surveys made by various individuals and organisations over the past 75 years or so has been analysed in an attempt to delineate spatial and temporal changes in the vegetation. This demonstrated the need for a standardised survey methodology to allow consistent monitoring. The analysis showed that bracken had been infiltrating most of the communities from its origins outside the lower limits of the Common as well as from some of the valley sides. Within the last decade, this expansion has apparently been contained in line with the current management plan for control. A survey of 730 quadrats in some 30 stands was made to characterise the variation of the vegetation on the plateau, and to relate it to some of the associated environmental factors. Classification, unconstrained ordination and ordination constrained by the abiotic environmental variables, showed that, a) the strongest trend in the vegetation distinguished water-flushed communities, b) non-wetland communities differentiate between heathland and grassland, c) this trend can be only partly be attributed to the measured abiotic environmental variables, d) the amount of pure Pteridietum [U20] is limited, although much of the heathland and grassland has bracken within it. There are indications that invasion by bracken often correlates with a loss of dominance of Calluna in favour of Deschampsia flexuosa and Vaccinium myrtillus. Difficulties in associating these trends with measured abiotic variables suggests, other factors probably management processes, are critical in driving this trend. Distribution of ‘heathland’ bryophytes was found to be associated more with the structure of their ‘host’ vascular communities rather than with abiotic factors. Finally, this investigation considers the practical implications with regard to the future encouragement of heather and the control of bracken. Cutting rather than burning appears to be the ecologically most suitable method for heather regeneration and bracken control.
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Edwards, Marianne Clare. "Detection and monitoring of arid grazing land vegetation using ATSR-2 and geometric optical modelling." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/10234.
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This study focused on the Badia region of Jordan and examined how low spatial resolution Along Track Scanning Radiometer (ATSR-2) and Advanced Very High Resolution Radiometer (AVHRR) data can be used to detect and monitor changes in grazing land vegetation in semi-arid environments. Comparisons were made between a wide range of different vegetation indices calculated using the red and near-infrared wavebands of both ATSR-2 and AVHRR imagery and field data collected at a series of sampling sites exhibiting a wide range of percentage vegetation covers. For the ATSR-2 data both the nadir and forward sensor view angles were considered. Poor correlations were found between the vegetation indices and field-measured vegetation cover for the Badia region. It was found that highly reflective soils, very sparse vegetation, and the xerophytic nature of vegetation in and regions limited the use of such indices. Furthermore, due to factors such as angle of view, spatial resolution and problems in geo-location, the forward view of ATSR-2 was not found to add any advantages in terms of the ability to detect and monitor the sparsely vegetated surfaces. As an alternative to vegetation indices, a hybrid geometric optical/empirically based model was developed for the area. Using the information given in the red/near-infrared scattergram of a satellite image, the model allowed percentage vegetation cover to be predicted from the remotely sensed data. Strong correlations (r² = 0.91) were found between the model-predicted percentage vegetation cover and that measured at the field sites. The estimates of percentage vegetation cover derived using the model were similar for both the ATSR-2 and the AVHRR imagery, suggesting that the model results are independent of sensor type. These results suggest that the geometric optical/ empirical model can improve the ability to map vegetation resources in and environments, and that the consistency of the results from the two different sensors should enable long term monitoring of the region.
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Miller, Lucas S. Kerley Monty Stephen. "Increasing land and forage utilization by Missouri cow/calf operations using silvopasture practices." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4593.
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Thesis (M.S.)--University of Missouri-Columbia, 2006.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed Aug. 27, 2007). Includes bibliographical references.
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Bisrat, Simon Abai. "Primary productivity and grazing capacity of rehabilitated pastures on the open-cut coal mines in central Queensland /." [St. Lucia, Qld. : s.n.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16208.pdf.
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Sarkar, Sunita. "Long- and Short-Term Dynamics of the Wetlands in the Amboseli Savanna Ecosystem, Kenya." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2978.
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The wetlands of the semi-arid savanna ecosystem of Amboseli are the critical dry-season range for a diverse wildlife population, as well as for livestock and humans. Changes in the migratory patterns and increases in the population of the elephants in the ecosystem, as well as a shift in the lifestyle of the growing human population from predominantly nomadic pastoralist society to a sedentary agrarian community, has had far-reaching effects on the ecosystem and the wetlands. In this thesis, the current status of the wetlands and the changes in vegetation over the last four decades were examined using satellite imagery and long-term census data. Studies were also conducted to determine the impact of grazing by elephants and other large mammals on wetland vegetation, and the flooding patterns and extents of some of the wetlands were examined. Long-term aerial count data indicated that the wetlands that are currently protected by the Amboseli National Park have been under increasing use year-round by elephants since 1975. These wetlands showed a rapid increase in extent between 1950 and 1976. This corresponds to the elephant-driven decline in Acacia xanthophloea woodlands, which may have changed the hydrology of the area. Since then, only one of the wetlands, Longinye, has shown dynamic changes in extent. This is either the effect of the blockage of water flow by vegetation or the creation of new channels by elephants and hippopotami. The wetlands had a diverse range of wetland habitat from areas of open water with scattered tall Cyperus papyrus communities in the centre of one wetland to large expanses of seasonally inundated C. laevigatus and Cynodon dactylon dominated habitats fringing the wetlands. Most of the wetland habitats were composed of short sedges and grasses, which was shown to be the direct result of elephant grazing. Elephants tended to keep the vegetation of a control wetland short and of low biomass during both wet and dry seasons, whereas the vegetation in a treatment wetland, where elephants were excluded, showed a rapid increase in biomass and height. Other herbivores were shown to maintain conditions of short vegetation of low biomass through grazing pressure in the dry season. The impact of natural and simulated grazing on growth of the vegetation was studied and only under simulated grazing pressure was growth increased in the seasonally inundated C. dactylon grasslands, as well as the floating mat communities dominated by C. laevigatus that occur in the shallow water wetlands. This indicates that natural grazing may be detrimental either to the plants or the soil.
The wetlands that are under human use had predominantly shallow water and seasonal wetland habitat. Deep water habitat with C. papyrus communities was only present in one of these wetlands, Kimana, which is also the only wetland outside the park that is used by livestock and wildlife, as well as to irrigate a large area of land around the wetland. Two other wetlands, Namelok and Lenkir that were predominantly used for irrigated agriculture, were largely composed of seasonally inundated wetland habitat. A fourth wetland, Esoitpus, has been almost completely drained and this has most likely resulted in the development of A. xanthophloea and C. dactylon dominated riverine and C. laevigatus / C. dactylon dominated seasonally inundated wetland communities.
Overall, the wetlands in the park provide a measure of habitat diversity that may be useful for various invertebrate and vertebrate communities. However, the present lack of tall sedges may negatively impact the bird community. This state can be reversed by the exclusion of elephants from some wetlands for short periods of time. On the other hand, the wetlands outside the park appear to be facing rapid draw-down. Hence, there is an urgent need for sound water management practices for these wetlands.
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Laliberté, Etienne. "Land-Use Intensification in Grazing Systems: Plant Trait Responses and Feedbacks to Ecosystem Functioning and Resilience." Thesis, University of Canterbury. School of Forestry, 2011. http://hdl.handle.net/10092/5109.
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Land-use change is the single most important global driver of changes in biodiversity. Such changes in biodiversity, in turn, are expected to influence the functioning of ecosystems and their resilience to environmental perturbations and disturbances. It is widely recognised that the use of functional traits and functional diversity is best for understanding the causes and functional consequences of changes in biodiversity, but conceptual development has outpaced empirical applications. This thesis explores these ideas in grazing systems, which are expected to undergo rapid intensification of fertiliser use and grazing pressure to meet the growing global demand for livestock products.
First, a flexible framework for measuring different facets of functional diversity is described, and a new multidimensional functional diversity index, called functional dispersion (FDis), is presented. Second, two vegetation sampling methods are compared with regard to their ability to detect changes in vegetation composition. Third, shifts in plant trait distributions following land-use changes are quantified and compared to null models, and a maximum entropy approach is used to quantify the direction and strength of selection on each trait. Fourth, it is shown that these shifts in trait distributions have cascading effects on primary production, litter decomposition, soil respiration, and ultimately soil carbon sequestration. Finally, data from 18 land-use intensity gradients are used to show that land-use intensification reduces functional redundancy and response diversity, two components of biodiversity that are thought to influence ecosystem resilience to future disturbances.
This study illustrates (i) the importance of considering species functional differences to understand how plant communities react to changes in soil resource availability and grazing pressure, and (ii) how such changes directly, indirectly, and interactively control ecosystem functioning, as well as (iii) increasing the vulnerability of ecosystems to future disturbances.
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Johnson, Laura Young. "Evaluation of Bureau of Land Management Protocols for Monitoring Stream Condition." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/45202.
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The goal of the Aquatic Indicators of Land Condition (AILC) project is to develop analytical tools that integrate land condition information with stream condition for improved watershed management within the United States Bureau of Land Management (BLM). Based on the goal of the AILC, two objectives for this study were: to determine the effect of four GIS-derived distance measurements on potential relationships between common BLM landscape stressors (mining and grazing) and changes in benthic macroinvertebrate community structure; and to assess the effectiveness of individual questions on a commonly-used Bureau-wide qualitative stream assessment protocol, the proper functioning condition (PFC) assessment.
The four GIS distance measurements assessed for biotic relevance included: straight-line distance, slope distance, flow length, and travel time. No significant relationships were found between the measured distance to stressor and macroinvertebrate community structure. However, the hydrological relevance of flow length and travel time are logically superior to straight-line and slope distance and should be researched further.
Several individual questions in the PFC assessment had statistically significant relationships with the final reach ratings and with field-measured characteristics. Two of the checklist questions were significantly related to the number of cow droppings. This may indicate a useful and efficient measure of stream degradation due to grazing. The handling and use of the PFC assessment within the BLM needs further documentation and examination for scientific viability, and the addition of quantitative measurements to the PFC in determining restoration potential would be desirable.Master of Science
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Hof, Angela. "Land use change and land cover assessment in grazing reserves in Northwest Nigeria : a geographical analysis based on remote sensing and geographic information science /." Bochum : Geograph. Inst. der Ruhr-Univ, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014706529&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Kraft, John Daniel. "Vegetation characteristics and lesser prairie chicken responses to land cover types and grazing management in western Kansas." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/34550.
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Master of ScienceDepartment of Biology
David A. Haukos
In the southern Great Plains, the lesser prairie-chicken (Tympanuchus pallidicinctus; hereafter LEPC), an obligate grassland species, has experienced significant population declines and range contractions with subsequent conservation concern. Management actions often use land cover types to make inference about habitat quality. Relatively little information is available related to grazed rangelands to guide conservation. The influences of land cover types and livestock grazing on LEPC habitat selection have not been researched extensively in western Kansas. I evaluated the influence of land cover types and grazing management on vegetation characteristics, habitat selection, and nest/adult survival of LEPC in western Kansas. Females were captured and radio-marked to monitor habitat use, nest success, and adult survival. Grazing and vegetation data were collected via producer correspondence and vegetation surveys, respectively. Vegetation composition and structure differed across land cover types, which can be used to make inferences about LEPC habitat quality. Habitat selection analyses corroborated the importance of breeding habitat in close proximity to leks (<3 km) and identified land cover types selected for nesting (Conservation Reserve Program, Limy Upland, Saline Subirrigated) and brooding (Conservation Reserve Program, Red Clay Prairie, Sands, Sandy Lowland). Conservation Reserve Program patches positioned near rangelands contributed to LEPC reproductive success in northwest Kansas. In grazed lands, LEPC selected habitat close to leks (<3 km) and large pastures (>400 ha), exhibiting low-moderate stocking densities (<0.4 AU/ha), and low-moderate levels of deferment during the grazing season (60-100 days). Nest site selection was negatively influenced by increasing distance from a lek and grazing pressure. Daily nest survival rates were negatively influenced by increasing grazing pressure and high levels of stocking density. Annual adult female survival was negatively influenced as forage utilization (% forage removed) increased. Heterogeneity (coefficient of variation and standard deviation) of visual obstruction was decreased at stocking densities > 0.26 AU/ha. Future conservation actions should consider the potential of land cover types to create adequate vegetation structure, and manage rangelands with low-moderate stocking densities and deferment and greater pasture areas. The relationship between habitat selection and proximity of lek sites (< 5 km) should be used to identify quality LEPC habitat.
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Sainsbury, Louise D. "Intensification in a Risky Environment: The Case of Improving Private Grazing Land for Beef Production in Utah." DigitalCommons@USU, 2001. https://digitalcommons.usu.edu/etd/6431.
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Utah ranchers commonly face risks to their livelihoods. The objective of this work was to determine if ranchers could make profitable improvements to private land forage given the combined threat of low beef prices, drought, and possible loss of public grazing.
We used linear programming (LINDO) to identify the most profitable solutions for private land investment with an 11-year simulation. Operations were divided into small, medium, and large size classes. Various forage improvements and public permits were options. Two phases of a beef price cycle (peak and trough) and 2 precipitation patterns (wet and drought) were combined as joint favorable or unfavorable scenarios. Simulations were run for each size class of operation under each scenario with a 0, 50, or 100% cut in public grazing. The analysis was based upon a partial ranch budget, namely, cattle and forage revenue less forage investment costs.
Under the favorable scenario of adequate precipitation and higher beef prices, all operations followed similar patterns of increasing herd size, retaining calves for sale as yearlings, selling alfalfa hay and barley, and treating various forages for enhanced production. All operations exhibited a positive net present value (NPV) over the 11 years. Reduction in access to public permits, however, reduced NPV more for medium-size operations most dependent on public grazing.
Under the unfavorable scenario, operation size affected response to combined effects of drought and low beef prices. Small and medium operations decreased brood herds while large operations tended to increase brood herds. Reductions in public grazing lowered NPV more for the small and medium operations compared to the large operations.
Work revealed 3 thresholds that could limit profitability of forage investment. These included: (1) dependency on public grazing for> 15% of total annual forage; (2) operation size <2001 >acres; and (3) beef prices of
Across all scenarios and operations it was generally profitable to improve 4 forage types that filled gaps at different seasons to the year: wet meadow, alfalfa hay, irrigated pasture, and crested wheatgrass. Irrigated pasture was most important when precipitation was high, illustrating risks of irrigation in this dry environment.
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Meng, Ying. "Lions grazing on the dragon's land : South African firms' business strategies in the Chinese market : navigating institutions." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/7585/.
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This research project is one of the first studies to focus on South African foreign direct investment (FDI) in Mainland China. Specifically, the research aims to identify and specify the key institutional factors that have contributed to the effectiveness or otherwise of South African firms entering and operating within the Chinese market, as well as to investigate the characteristics and processes that have effectively shaped South African firms’ business strategies to negotiate the current Chinese institutional environment. The research adopts an institutional perspective, fusing two separate disciplinary study frameworks, international business (IB) and international political economy (IPE), to draw out the key institutional factors that South African firms entering and operating within the Chinese market have encountered. The principal contributions of the thesis are conceptual and empirical: the latter presenting case studies of a cross-section of South African business actors who have sought to penetrate the Chinese market; the former centring of a model which emphasises the importance of both formal and informal business processes and practices in influencing business success and failure in context.
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Paxton, Michael Taylor. "Effects on birds of different land-uses in north-eastern Botswana / Michael Taylor Paxton." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9530.
Full textAbstract:
A drive into the country will soon confirm the effects of agriculture on the environment. Different agricultural practices such as vast fields of monocultures, forests of exotic timber, and large intensive feed lots of livestock, will be evident. The need to provide food for an increasing population particularly in Africa is the driving force behind the intensification of agriculture. The production of increased food supply is often considered without knowledge of the impacts on the environment.
The North East District of Botswana is a small district compared to other districts of Botswana but unlike these large districts the population density is comparably high with a demand for agricultural space. Botswana is a desert margins area under threat of desertification with many signs of desertification being evident throughout the country. The main agricultural activity in the North East District is livestock farming with horticulture being practiced on the banks of sandy river beds. The district provided an ideal area to compare the impacts of different livestock farming techniques.
Four different approaches of livestock farming were examined with the number of livestock cattle in particular, being a noticeable difference and the grazing intensity of these cattle being another important difference. This study examined the impacts of these different grazing techniques on the environment with a particular reference to birds. Data was collected using a point count system with 28 points evenly spaced in a grid across the different land uses. Each point was subject to a total of six surveys with summer and winter having three surveys each. It was expected that bird numbers and species would be impacted by the grazing intensity while the different feeding and nesting guilds may also respond to grazing intensity. Statistical analysis included geostatistical analysis, uni-variant, mult-variant and non-metric multi-dimensional scaling.
The results show that birds were impacted by grazing intensity with species richness and bird numbers being negatively affected. However, feeding and nesting guilds were impacted differently. Climate change and land degradation are a reality and will impact on avian diversity and sound management practices need to be implemented to protect biodiversity in marginal areas.Thesis (Master of Environmental Sciences)--North-West University, Potchefstroom Campus, 2013
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Janse, Van Rensburg Marjorie. "Nutritive value of tall fescue (Festuca arundinacea) established on rehabilitated mineland for grazing cattle." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/40338.
Full textAbstract:
Sustainable animal production on pasture planted on rehabilitated mine land will only be possible if
the optimal stocking rate for animal and pasture production is determined. A grazing trial was
conducted on tall fescue, established on rehabilitated mine land and irrigated with mine waste
water. The aims of this study were to quantify: a) animal performance and nutritive value at
different levels of nitrogen (N) fertilization during pasture establishment, and b) intake, animal
performance (defined as average daily gain; ADG) and nutritive value when different stocking rates
were applied. This study was done during two seasons: season one in winter (6 June -16 July
2008) and season two in spring (28 Aug – 6 Nov 2008). In terms of post mining land use this study
supplied valuable information on potential livestock production.
The higher level of N fertilization applied during the winter of 2007 at pasture establishment
resulted in a significantly (P < 0.05) higher crude protein (CP) concentration a year later compared
to the lower levels of N fertilization. During the winter grazing season the pasture contained an
average of 83.4 g CP kg-1 dry matter (DM), 601.9 g NDF kg-1 DM, 6.2 g Ca kg-1 DM and 1.7 g P kg-1
DM, the average in vitro organic matter digestibility (IVOMD) was 642.2 g kg-1 OM and the average
leaf: stem ratio was 88:12. The ADG of crossbred weaner calves grazing the low N fertilization
(LN), low stocking rate (LS) paddock (229.1 g day-1) was significantly (P < 0.05) lower than the
ADG of weaner calves grazing the LN, high stocking rate (HS) and the high N (HN), LS
respectively. The ADG of the animals in the HN, LS paddock was 482.7 g day-1 and in the LN, HS
paddock was 310.6 g day-1. The low ADG for the LS treatment was due to the low CP
concentration of this paddock, with values as low as 55.1 g CP kg-1 DM recorded during the winter
grazing period. Low pasture nutritive value during winter can potentially limit animal production.spring grazing season the pasture contained an average of 101.0 g CP kg-1 DM, 639.1
g NDF kg-1 DM, 8.9 g Ca kg-1 DM and 2.1 g P kg-1 DM. The average leaf: stem ratio was 85:15,
IVOMD was 717.5 g kg-1 OM and effective DM degradability (in situ) was 56.1 %. The average OM
digestibility estimated with the alkane method varied between 720.8 to 768.3 g kg-1 depending on
the alkane used and weather a correction was made for the faecal recovery of the alkane used. On
average the forage available in the paddock with the LS had a significantly (P < 0.05) higher CP
concentration, leaf: stem ratio and IVOMD, with a significantly (P < 0.05) lower NDF concentration
than the HS paddock. This is probably due to the fact that in the HS paddock forage with a high
nutritive value was removed at a higher rate. Irrespective of the calculation used, digestibility
calculated by the alkane method did not differ significantly (P > 0.05) between paddocks at any
time period. The average intake in the paddock with medium grazing stocking rate (MS) was
significantly (P < 0.05) higher than the average for the other paddocks. The paddock with the MS was managed to supply a pasture DM allowance of 2.5 % body weight (BW). The DM intake over
the spring season was 2.2 % BW. The MS treatment supplied sufficient plant material without
resulting in large accumulation of plant material. The ADG for the spring season was 110.5 g day-1
and averages for each paddock did not differ significantly (P > 0.05) from each other.
During theDissertation (MSc Agric)--University of Pretoria, 2013.
gm2014
Animal and Wildlife Sciences
unrestricted
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Kulikov, Maksim [Verfasser], and Udo [Akademischer Betreuer] Schickhoff. "Effects of land use and vegetation changes on soil erosion of alpine grazing lands - Fergana Range, Southern Kyrgyzstan / Maksim Kulikov ; Betreuer: Udo Schickhoff." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1172415544/34.
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Mpotokwane, Masego Ayo. "Variation in cattle numbers, rainfall amount and land availability in Tlokweng sub district, Botswana." Thesis, University of Stirling, 1999. http://hdl.handle.net/1893/21836.
Full textAbstract:
This study describes and analyses cattle management in Tlokweng Sub District. Two methods were used. The two are households' interviews and a system dynamics STELLA model called the Rain Land Cattle model, which was adapted from the 1990 Braat and Opschoor model. Ninety households, 61% of the 1991 households in the study area, were interviewed. All the households had arable fields and fifty nine percent had cattle. The Rain Land Cattle model uses 52 parameters to predict several cattle management factors, which include rainfall, stocking rate, total grazing area and livestock water availability. The model explored the use of parameters to relate water availability to grazing area and show the seasonality of the water source. Sixty two percent of the household had access to an ideal livestock water source. Cattle graze from the 5000 hectares of arable area for four months after harvesting. This seasonal grazing, optimises the uses of the grazing resource in the small sub - district. The model simulated a S and 20 percent permanent grazing land loss. Such a grazing land loss, increased the stocking rate, decreased the carrying capacity and cast doubt on sustainable cattle production. The model shows that the stocking rate is chronically greater than the carrying capacity. Most households acknowledged that there was land pressure due to the loss of grazing land. A drier climate scenario will lead to a loss of seasonal grazing, reduced livestock water, which will increase cattle emigration and cause cattle management problems. The model is exploratory; it needs to be validated. It is easily understood, adaptable to other communal areas, and identifies the most influential factors in cattle management. The livestock water parameters functioned reliably in the model. Based on the understanding of the cattle management derived from this study, more fenced grazing land is unlikely to improve the cattle management in the area.
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Becker, Wayne. "Effect of Rancher’s Management Philosophy, Grazing Practices, and Personal Characteristics on Sustainability Indices for North Central Texas Rangeland." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc103289/.
Full textAbstract:
To assess sustainability of privately owned rangeland, a questionnaire was used to gathered data from ranches in Cooke, Montague, Clay, Wise, Parker, and Jack counties in North Central Texas. Information evaluated included: management philosophy, economics, grazing practices, environmental condition, quality of life, and demographics. Sustainability indices were created based on economic and land health indicator variables meeting a minimum Cronbach‘s alpha coefficient (α = 0.7). Hierarchical regression analysis was used to create models explaining variance in respondents’ indices scores. Five predictors explained 36% of the variance in rangeland economic sustainability index when respondents: 1) recognized management inaction has opportunity costs affecting economic viability; 2) considered forbs a valuable source of forage for wildlife or livestock; 3) believed governmental assistance with brush control was beneficial; 4) were not absentee landowners and did not live in an urban area in Texas, and; 5) valued profit, productivity, tax issues, family issues, neighbor issues or weather issues above that of land health. Additionally, a model identified 5 predictors which explained 30% of the variance for respondents with index scores aligning with greater land health sustainability. Predictors indicated: 1) fencing cost was not an obstacle for increasing livestock distribution; 2) land rest was a component of grazing plans; 3) the Natural Resource Conservation Service was used for management information; 4) fewer acres were covered by dense brush or woodlands, and; 5) management decisions were not influenced by friends. Finally, attempts to create an index and regression analysis explaining social sustainability was abandoned, due to the likely-hood of type one errors. These findings provide a new line of evidence in assessing rangeland sustainability, supporting scientific literature concerning rangeland sustainability based on ranch level indicators. Compared to measuring parameters on small plots, the use of indices allows for studying replicated whole- ranch units using rancher insight. Use of sustainability indices may prove useful in future rangeland research activities.
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Webb, Darryl Matthew. "Assessing the potential of mixed grazing goats with beef cattle to improve animal performance and increase the utilization of marginal pasturelands in the Appalachian coal region." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31747.
Full textAbstract:
Reclaimed coal-mined lands in the Appalachian region can be successful established and utilized for beef cattle production. Currently, these areas are underutilized partly due to an increase in invasive plant species, such as multiflora rose (Rosa multiflora Thunb. Ex Murr.), autumn olive (Elaeagnus umbellata Thunb.), and sericea lespedeza (Lespedeza cuneata (Dum.-Cours.) G. Don). The steep topography and low economic returns from beef cattle make conventional control methods inhibitive. Goats are effective browsing on invasive plant species. An experiment was conducted in 2006 and 2007 at the Powell River Research and Education Center near Wise, VA (77° 43' 30" west longitude, 38° 57' 30" north latitude, elevation 155.5 m) to determine the effects of an ungrazed control, cattle alone grazing, and mixed grazing goats with cattle on forage biomass, botanical composition, relative plant abundance, and animal performance. The three treatments included an ungrazed control, cattle grazing alone, and mixed grazing goats with cattle. Experimental design was a randomized complete block design with two replicates for the control and three replicates for the grazed treatments. Three times during the grazing season the following were measured, analyzed or assessed: nutritive values of pasture, autumn olive, multiflora rose, and sericea lespedeza were assessed; forage biomass was determined by clipping four 0.25 m² quadrants per control replicate and eight 0.25 m² quadrants per grazed replicate; botanical composition and relative abundance of plant species was assessed by the Double DAFOR method from five fixed points in each control replicate and ten fixed points in each grazed replicate; animals were weighed; autumn olive shrub height was measured with a clinometer from a distance of 10 m from the shrub. Branch length was measured with a tape measure from the base of the branch to the end tip. Shrub survival was measured by counting shrubs in each replicate and determining visually percent leaf-out. Each year, control and cattle alone treatments had greater (P < 0.05). Generally, grass content increased in the
grazed treatments from spring to fall while weed content increased in the control treatment (P < 0.05). By the end of the two experimental years, the legume components of the pasture were low. This was more evident in the ungrazed control than the grazed treatments. The relative abundance of tall fescue and orchardgrass (P < 0.05) increased in grazed treatments while sericea lespedeza became a dominant weed in the control (P < 0.05). Goats showed high preference for sericea lespedeza and maintain this plant in a leafy, vegetative stage. This leafy, vegetative growth was found to acceptable to cattle. Cattle performance was not affected by treatment (P < 0.05) but total animal output was higher for mixed grazed compared to cattle alone treatments (P < 0.05). The nutritive values of multiflora rose, autumn olive, and sericea lespedeza were higher than pasture in most instances (P < 0.05). In our experiment, autumn olive was severely impacted by goat browsing. Shrub survival was lower in mixed grazing (61%) by the end of the experiment compared to over 90% for the control and cattle grazing treatments (P < 0.05). Overall, pastures were utilized more uniformly in mixed grazing compared to other treatments. Mixed grazing goats with cattle appear to be a viable option for livestock producers in the Appalachian coal mining region.Master of Science
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Ntshona, Zolile Mninawa. "The contribution of communal rangelands to rural people's livelihoods in the Maluti district." University of Western Cape, 2001. http://hdl.handle.net/11394/7390.
Full textAbstract:
Magister Philosophiae (Land and Agrarian Studies) - MPhil(LAS)The contribution of common property resources to rural people's livelihoods is enormous, yet policy makers overlook it. Wild resources, grazing resources and trees provide an important buffer for most rural households. This study investigates the contribution of common property resources, in particular communal rangeland resources, to rural people's livelihoods in the Maluti District of the Eastern Cape, South Africa. Looking at an array of livelihood strategies which people use, the study investigates the proportional contribution of different livelihood strategies with reference to common property resources, specifically wild resources, grazing resources and trees.
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McAdam, James Henry. "A study of management factors affecting the contribution of white clover to swards for autumn grazing on improved hill land." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317127.
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Muthreich, Florian. "Effect of historical land-use on lake-water carbon and geochemistry: : A multi-proxy study of two lake sediment profiles in Dalarna throughout the Holocene." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121525.
Full textAbstract:
This study examines changes in lake-water total organic carbon (LW-TOC) and lake sediment geochemistry in two lakes, Stångtjärnen and Holtjärnen in (Dalarna, Sweden), during the Holocene and the role of the historic forest grazing and farming (fäbod-system). The aims of the study were to: 1. Discern the effects of natural processes on the lake’s biogeochemistry in different position in the landscape. 2. Identify the effects and differences in intensity of historic land-use on the lakes. A multi-proxy study was conducted encompassing multi-element (15) geochemistry, biogenic silica, LW-TOC, chlorophyll a and published pollen records. The first lake, Stångtjärnen, is shaped and influenced by surrounding mires, which developed shortly after deglaciation and stabilized the LW-TOC at 19 mg L-1 throughout most of the Holocene, while Holtjärnen, a small upland lake, changed from a productive lake (BSi: 35 %), low humic (LW-TOC: 8 mg L-1) to a less productive (BSi: 4 %) more humic lake (LW-TOC: 12 mg L-1) in 7300 BP. The intensification of agricultural land-use (e.g. hay-making) in Stångtjärnen reduced the concentrations of organic associated elements (Br, Cl) and LW-TOC and increased lithogenic elements (K, Ti), while Holtjärnen showed less anthropogenic influence. The comparison between the two lakes displayed the intensive influence of land-use on the Stångtjärnen catchment, showcased by changes in the sediment geochemistry, vegetation composition and the extent of the forest-grazing system in a landscape perspective. In response to the changes of the Holocene, Stångtjärnen’s mires became the main influence, while Holtjärnen was more sensitive to changes.
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Talore, Deribe Gemiyo. "Quantitative and qualitative herbage yield, and carbon sequestration in subtropical grasslands subjected to different precipitation, grazing management and land use type." Thesis, University of Pretoria, 2015. http://hdl.handle.net/2263/57290.
Full textAbstract:
Rainfall variability in and between seasons, lower soil organic matter content, land degradation, and the associated low biomass yield and poor quality of forage are major constraints to livestock production in the subtropical grasslands of South Africa. In this study, the influences of changes in precipitation, grazing management and other land-use types on carbon (C) and nitrogen (N) sequestration potential, herbage yield and nutritive quality were investigated by collecting data from i) the long-term grazing trial site at Grootfontein Agricultural Development Institute (GADI), an arid grassland in Middleburg, Eastern Cape; ii) various land-use types in a semi-arid area, Pretoria; and iii) short-term experimental plots set up in semi-arid grassland in Pretoria, South Africa.
In the first study, various land-use types (Leucaena sp. plots, exclosures, cultivated pasture and croplands) were compared for soil carbon (C) and nitrogen (N) storage. Leucaena spp. plots and exclosured lands improved C and N stocks, due mainly to high biomass returns to the soil, while frequently cultivated pasture and croplands had generally lower C and N stocks. Although soil bulk density and soil chemical parameters such as C, N, calcium (Ca), potassium (K), magnesium (Mg), sodium (Na), and pH were affected by land-use type, it was only the C and N stocks that showed land-use by soil depth interaction. This indicates that C and N are more sensitive to frequent soil disturbances and cultivation, compared with other soil properties, which were less affected by soil depth.
In the second study, the long-term impacts of grazing management (namely stocking rate and season of use) on selected soil properties were investigated by collecting soil samples from the long-term grazing experimental site at GADI, Middelburg, Eastern Cape, South Africa. Aristida congesta, A. diffusa and Eragrostis lehmanniana were dominant grass species while Pymaspermum parvifolium, Felicia murcata, Salsola Caluna, Walafrida geniculata, Diospyros austroafricana, Diospyros lycioides were dominant shrub species in the study area (Du Toit et al. 2011). Findings from this study indicated that in this arid region of the country, grazing at contrasting stocking rates (light , 0.78 small stock unt ha-1and heavy, 1.18 small stock unit ha-1) resulted in lower soil organic C and total N concentration compared with the non-grazed control (exclosure). Similarly, both spring and summer grazing resulted in reduced soil C and N stocks, lower water infiltration rate, and higher soil compaction compared with the non-grazed control, due mainly to plant removal from animals feeding on the forage, and animal treading and trampling. Generally, animal exclusion improved C and N stocks and, among others, resulted in higher water infiltration and lower soil compaction. Improved land and livestock management through the establishment of multipurpose tree species and strategic animal exclusion would improve C and N storage in vast potentially restorable grazing areas of South Africa.
The last experiment was designed to study the effects of different levels of precipitation (simulated drought) and defoliation intervals on soil-water content (SWC), herbage yield and quality. The study was conducted for two years at Hatfield Experimental Farm, University of Pretoria, using rainout shelters to intercept 0%, 15%, 30% and 60% of ambient rainfall as the main plot treatment and two defoliation intervals (45-day and 60-day) as sub-plot treatments. Both rain interception (RI) treatments and defoliation intervals influenced SWC, herbage yield and quality. Rainfall amount and distribution varied within and between years. This variation was confirmed by the negative climatic water balance (precipitation minus evapotranspiration, PET-ET) in most months during the study period, suggesting that the trial site was moisture stressed mainly during the active plant-growing period owing to high atmospheric water demand. In 2013/14, SWC was reduced in the 60% RI treatment, while there were no differences between RI treatments in 2014/15. Generally, SWC of 40 60 cm was higher, compared with the top (0 20 cm) soil layer, mainly because of high surface evapotranspiration and water uptake by plants in top soil layers. The positive linear relationship between herbage yield and precipitation implies that the amount of precipitation influences grassland biomass production. In this study, the DM yield of dominant species showed differences within seasons as well as between seasons. Generally, grass species contributed a significantly (67%) higher proportion of the total plant biomass and maintained community stability in the sub-climax to climax stages. Forbs and shrubs also played a major role by occupying early niches and protecting soil from wind and water erosion across the RI plots. Thus, maintaining important forbs and shrubs is vital for the revitalization of grassland to restore biodiversity. The simulated severe drought of 60% RI caused detrimental herbage yield decline. However, it resulted in improvements in rain-use efficiency (RUE) and some feed quality attributes (namely crude protein (CP) and in vitro organic matter digestibility (IVOMD). Mid-season (January and February) harvests showed high herbage yield, and the recorded yield was proportional to the amount of rainfall. The study also showed that in dry events, when the rainfall of the site decreased by 30% and 60% of the ambient rainfall, defoliating plants at longer intervals (60-day) improved grassland biomass production. The variations found between and within species in yield and nutritive value under different precipitation and defoliation conditions would possibly help to identify adaptable species in future climate change scenarios and management conditions in moisture-stressed areas of South Africa.Thesis (PhD)--University of Pretoria, 2015.
tm2016
Animal and Wildlife Sciences
PhD
Unrestricted
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Piquer-Rodríguez, Maria. "Effects of policies and zoning on future land use in Argentina." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17762.
Full textAbstract:
Landwirtschaftliche Expansion und Intensivierung treiben die Umwandlung natürlicher Ökosysteme weltweit. Bis heute ist unklar, inwieweit politische Maßnahmen negative Folgen für die Umwelt minimieren können. Die Kombination mit Szenarien-Analysen kann ein Rahmen zur Unterstützung von Planungsprozessen schaffen, um potentielle Auswirkungen von politischen Maßnahmen zu erforschen. Das Ziel dieser Dissertation war es, die Triebkräfte der Veränderung von Argentiniens Agrarlandschaften zu verstehen, potentielle zukünftige Landnutzungsveränderungen zu analysieren und den Einfluss ökonomischer und naturschutzbezogener politischer Maßnahmen auf diese zu erfassen. Im ersten Teil der Dissertation wurden die Triebkräfte landwirtschaftlichen Landnutzungswandels mittels eines Nettoertrags-Modells ermittelt. Danach wurde der Einfluss von ökonomischen und naturschutzbezogenen Maßnahmen auf zukünftige Landnutzungsveränderungen sowie auf die Konnektivität von Waldgebieten mit Hilfe von Landnutzungs-Szenarien analysiert. Die Ergebnisse zeigen, dass landwirtschaftliche Intensivierung von ökonomischen Maßnahmen getrieben ist, während landwirtschaftliche Expansion durch naturräumliche Eigenschaften und Zonierungsprogramme jenseits der Profitmaximierung determiniert wird. Politische Maßnahmen mögen einen geringeren Einfluss auf Landnutzungswandel haben als bisher erwartet. Die Entwicklung von Agrarland konzentriert sich auf Gebiete mit hoher Priorität für den Umweltschutz. Zonierungsprogramme wie das Argentinische Waldgesetz stellen wirkungsvolle Maßnahmen dar, um umweltschädigenden Entwicklungen vorzubeugen. Die Erkenntnisse zeigen, dass Naturschutz nicht zwingend im Konflikt mit ökonomischer Entwicklung steht, denn mittels Landschaftsplanung kann die Konnektivität von Waldgebieten auch unter gleichbleibenden Abholzungsraten bewahrt werden. Die Dissertation zeigt den Mehrwert von a-priori Evaluierungen der potentiellen Einflüsse von Maßnahmen auf Landnutzungswandel.Agricultural expansion and intensification drive the conversion of natural areas worldwide. Yet, it is not clear where and how much production would need to expand and intensify to meet future demands and how policies may help minimizing environmental trade-offs. Particularly the latter requires an understanding of the underlying forces that drive agricultural land-use changes. This offers a framework for planners and decision makers to explore potential impacts from policies, especially in very dynamic regions. Argentina, where agricultural expansion and intensification result in dramatic conversions of natural areas, is a good example of a dynamic human-environment system. The goal of this thesis was to understand the drivers of agricultural land-use change and to explore future trajectories of land-use change, and how economic and conservation policies may impact them. This thesis examines drivers of agricultural land-use changes using a net returns model of agricultural production. Then, it evaluates the effects of economic and conservation policies on future land-use changes and on the connectivity of forests by developing scenarios of future land-use change. Results highlight that agricultural intensification in Argentina is driven by economic interventions, whereas agricultural expansion primarily responds to environmental characteristics and zonation programs. Economic policies may have less power in governing land use changes than previously thought, as results suggest that there are other factors, than profit maximization, influencing land conversions. Future agricultural development would occur in priority areas for conservation in Argentina, but zonation policies, such as the Forest Law, appear to be powerful in limiting potential environmental trade-offs. Conservation planning does not necessarily need to conflict with economic development, since under similar deforestation rates; landscape planning can preserve forest connectivity in the Chaco.
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Pinto, Robin Lothrop. "Cattle Grazing in the National Parks: Historical Development and History of Management in Three Southern Arizona Parks." Thesis, The University of Arizona, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3625734.
Full textAbstract:
This dissertation traces the history of cattle grazing at Saguaro NP, Organ Pipe Cactus NM and Fort Bowie NHS in southern Arizona. This collection of studies examines the factors affecting that use, the ranchers who made their living from the landscape, and the federal land managers responsible for sustaining the natural and cultural resources.
A dominant industry on arid public lands since the Civil War, grazing was altered by a variety of influences: environmental and human-derived. Ranching communities developed from homesteading settlements. Success was determined by climate, topography, and natural resources; social and cultural pressures; economic events and political legislation; and later federal regulations and decisions.
The first agency to oversee grazing, USFS was under constant pressure to maximize short-term human benefits. The NPS Organic Act of 1916 mandated conservation of natural resources "by such means as will leave them unimpaired for future generations" and yet approved cattle grazing, an extractive use, under USFS management. Park managers were frustrated by grazing practices not under their control. Parks were at a cultural and social disadvantage. Residents and politicians often expressed displeasure at park reservations; communities feared that parks would interfere with local industries.
Park employees supervised visitors and developed recreation infrastructure; they came with little experience to manage livestock. Lack of funding for research, limited manpower, and political and administrative interference allowed cattle grazing to continue unregulated for decades altering vegetation and enhancing erosion. In the 1960s, changing values from the environmental movement, the waning power of the livestock industry, and the rise of activist scientists impelled NPS to act. Without monitoring data, NPS turned to legal opinions to terminate grazing.
Now grazing is regulated and carefully monitored. NPS is mandated to incorporate research results into management decisions. Older grazing permits are being retired, but land acquisitions for park additions add new management challenges. Purchasing permits offers a new but financially limited opportunity to protect sensitive lands. Grazing has ended at all three parks, yet ecological changes and historic structures remain. As cultural and administrative legacies, those remnants offer opportunities to interpret a significant regional tradition and an untold controversy.
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Cochran, Michele A. "Effect of land application of fluidized-bed combustion residue on soil and plant characteristics of reclaimed surface-mined pastures, performance and mineral status of grazing steers and nutrient balance by sheep fed the forage." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43389.
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Smet, Michiel. "Rangeland degradation around water-points under different management systems." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50074.
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Thesis (MScConEcol )--University of Stellenbosch, 2004.ENGLISH ABSTRACT: Over 70% of South Africa is too arid for crop farming and is used for commercial livestock ranching, communal livestock ranching, or game ranching. These management systems differ from each other in a number of aspects, e.g. herbivore species, stocking rate, grazing regime, and management structure. The main question addressed in this study is: to what extent do the three management systems affect rangeland condition? Following the equilibrium paradigm of vegetation dynamics, communal livestock ranches are expected to have a greater detrimental effect on rangeland condition than other management systems because stocking densities and, consequently, herbivore impacts, are usually far higher than under the other two management systems. However, recent nonequilibrium theories argue that vegetation dynamics in arid systems are mainly driven by rare and stochastic rainfall events. Biotic factors, such as grazing and herbivore diversity, are predicted to have little effect on rangeland condition. This leads to the prediction that herbivore impacts on arid ecosystems are not density-dependent and, consequently, the high stocking densities commonly recorded on communal livestock ranches will not cause more rangeland degradation than other management systems. Arid and semi-arid rangelands are characterised by high inherent spatial and temporal variation in vegetation and soil parameters. Hence, differentiating between the effects of grazing management systems and natural variability caused by abiotic factors, such as rainfall, is difficult. This problem can be circumvented by examining gradients of grazing intensity radiating from water-points (= piospheres). I examined changes in vegetation and soil parameters along 500 m-Iong grazing gradients on ranches in the semi-arid Northem Cape province, South Africa, with the three abovementioned management systems. Analysis of the vegetation on these ranches demonstrated the existence of grazing gradients around the water-points. Two characteristic zones described in other studies were identified, namely the sacrifice zone (almost complete denudation of the vegetation close to the water-point) and the dense shrub zone (distal to the sacrifice zone). Communal livestock ranching had a greater negative effect on rangeland vegetation than the two other ranching systems, particularly with regard to annual grass species diversity, percentage of bare soil, and shrub density. Within 100 m of the water-points, soil quality was negatively affected by commercial cattle ranching. Contrastingly, there were no significant effects of the other two management systems on soil quality in the piosphere. The feeding of supplemental forage and nutrients may explain the greater impact of commercial cattle farming on soil quality. The results of this study are consistent with the predictions of the equilibrium theory of vegetation dynamics because grazing impacts were density-dependent in these semi-arid rangelands. However, the results presented here also indicate that forage supplementation alters the spatial and temporal distribution of livestock in a manner that may have greater negative impacts on soil quality than density of livestock per se.
AFRIKAANSE OPSOMMING: Meer as 70% van Suid-Afrika is te droog vir gewasverbouing en word gebruik vir kommersiële veeboerdery, gemeenskaplike veeboerdery of wildboerdery. Die bestuur van dié verskillende boerderytipes verskil wesentlik van mekaar in verskeie opsigte, ondermeer herbivoorspesies, veeaanskaffingstempo, weidingstipe en bestuurstruktuur. Die belangrikste vraag wat aangespreek word in die studie is die volgende: Tot watter mate affekteer die drie verskillende boerderybestuurstipes die toestand van weivelde? Gesien teen die agtergrond van die ekwilibriumparadigma van plantedinamika, word verwag dat gemeenskaplike veeboerdery 'n groter impak op die toestand van weiveld sal hê as ander boerderytipes, omdat veedigtheid en gevolglik herbivoor-impak gewoonlik veel hoër is as met die ander twee boerderytipes. Onlangse nie-ekwilibria-teorië voer egter aan dat plantedinamika in ariede gebiede gedryf word deur seldsame en buitengewone reënvalgebeure. Biotiese faktore, soos weiding en herbivoor diversiteit sal na verwagting min effek hê op die toestand van weiveld. Hieruit volg die voorspelling dat herbivoorimpak op ariede ekosisteme nie afhanklik is van digtheid nie, en dat hoë veedigtheid algemeen aangeteken vir gemeenskaplike boerderye, nie rede sal wees vir groter ver1iese in weiveld nie. Ariede en semi-ariede weivelde word gekenmerk deur 'n hoë ruimtelike en tydelike veranderinge in plant- en grondparameters. Gevolglik is dit moeilik om te onderskei tussen die effekte van weidingsbestuur en natuur1ike veranderings wat veroorsaak word deur nie-biotiese faktore, soos reënval. Dié probleem kan oorbrug word deur gradiënte van weidingsintensiteit, wat vanaf waterpunte uitstraal, te ondersoek. Vervolgens het ek binne al drie bg. boerderybestuursisteme veranderinge in plant- en grondparameters langs SOOm-lange weidingsgradiënte ondersoek op plase in die semiariede Noord-Kaap provinsie van Suid-Afrika. Plantegroei-analise het getoon dat 'n weidingsgradiënt rondom waterpunte voorkom. Twee kenmerkende sones is in ander studies geïdentifiseer, nl., 'n opofferingsone (waar amper alle plantegroei naby waterpunte uitgetrap is) en die digte, struik-sone (distaal to die opofferingsone). Gemeenskapsveeboerdery het 'n groter negatiewe effek op plaasgewasse as die ander twee boerderytipes, veral waar dit betrekking het op grasspesie-diversiteit, persentasie grond sonder plantbedekking en struikdigtheid. Binne 100m vanaf waterpunte, is grondkwaliteit merkbaar negatief geaffekteer deur kommersiële veeboerdery. Daarteenoor, was daar geen merkbare effek op die grondkwaliteit naby waterpunte van die ander twee boerderytipes nie. Aanvullingsvoer kan moontlik die rede wees vir die waargenome, groter impak van kommersiële veeboerdery op grondkwaliteit. Die resultate van die studie strook met voorspellings van die ekwilibria-teorie van plante-dinamika, daarin dat weidingsimpak digtheidsafhanklik is in hierdie semiariede plaasgebiede. Die resultate toon ook egter, dat voedingsaanvullings die ruimtelike en tydelike verspreiding van vee in so 'n wyse verander, dat dit moontlik 'n veel groter negatiewe uitwerking op grondkwaliteit het as veedighteid per se.
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Lang, Brett M. "The Intervention of Human Modifications on Plant and Tree Species in the Landscape of the LBJ National Grasslands." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801905/.
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An analysis utilizing both ArcGIS and ethnographic interviews from private land owners and environmental professionals examined how man-made landscape changes affected plant and tree species in the LBJ National Grasslands in Wise County, Texas north of Decatur. From the late 1800s to the Dust Bowl Era the land was used for crop production and cattle grazing resulting in erosion and loss of soil nutrients. The research indicated by 2001 that cattle grazing and population increase resulted in land disturbance within the administrative boundary of the national grasslands. Participants expressed concern over the population increase and expansion of 5 to 10 acre ranchettes for cattle grazing common in modern times. Recommendations for the future included utilizing and expanding the resources already existing with environmental professionals to continue controlling erosion.
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Lindén, Cecilia. "Local plant species diversity in coastal grasslands in the Stockholm archipelago : The effect of isostatic land-uplift, different management and future sea level rise." Thesis, Stockholms universitet, Institutionen för naturgeografi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-151335.
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Semi-natural grasslands with traditional management are known to be very species-rich, with many plant species strongly associated with the habitat. The last century’s decline of semi-natural grasslands, as a result of land use change and abandonment, has made the remaining semi-natural grassland a high concern for conservation. Since management can be costly and the available resources often are limited, it is important to use the most beneficial management method for preserving and enhancing the biodiversity. One semi-natural grassland type of certain interest around the Baltic region are coastal grasslands. In this study, I investigated vascular plant species occurrence in ten managed coastal grasslands located in the Stockholm archipelago. The effect of recent land-uplift and future sea level rise on the ten coastal grasslands were analyzed as well. A major part of all ten grasslands had been subjected to the process of isostatic land-uplift the past 100 years. Five of the grasslands were currently managed by grazing and the other five were managed by traditional mowing. There was no significant difference in alpha and gamma diversity between the two management types. Though, higher biodiversity values, such as more different species found in total, higher amount of species typically linked to meadows and pastures, less succession species and more red-listed species, were found in the traditionally mowed grasslands. Furthermore, a sea level rise with 40 cm the next 100 years in the region would lead to loss of plant species diversity in the investigated coastal grasslands. One major concern is the limited areas upwards on the coastal grasslands for species to migrate to in the future, which is expected to primarily affect species associated with meadows and pastures. The study highlights the importance of open and managed grassland areas further up the coastal grasslands for local species to migrate to, if the sea level would rise as predicted by future climate scenarios. Albeit weak the results of this study indicate that traditional mowing generates higher biodiversity values compared to grazing, hence it should be the preferred management method in coastal grasslands in the Stockholm archipelago.
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Ylänne, H. (Henni). "Herbivory control over tundra carbon storage under climate change." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526215105.
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Abstract Air temperatures in high-latitude regions are anticipated to rise by several degrees by the end of the century and result in substantial northward shifts of species. These changes will likely affect the source and sink dynamics of greenhouse gases and possibly lead to a net carbon release from high-latitude soils to the atmosphere. However, regional differences in carbon cycling depend highly on the vegetation community composition, which may be controlled by the abundance of herbivores. I investigated whether mammalian herbivores, mainly reindeer and rodents, alter ecosystem carbon storage through their impacts on vegetation and on dominant plant functional traits. I combined observations of recent changes in ecosystem carbon with experimental field manipulations of both herbivory and climate change and measured carbon storage in vegetation and soil, the uptake and release of carbon dioxide, microbial activity and compared these to plant community composition. Results of my PhD thesis show that under ambient conditions, the impacts of herbivory on both above- and belowground carbon storage ranged from positive to negative. Herbivory altered dominant plant functional traits and these were fairly good predictors of the changes in soil carbon. When combined with experimental warming, herbivory continued to exert control on the dominant plant functional traits but the strong effects of warming on ecosystem carbon storage mostly concealed the impact of herbivory. Interestingly, herbivory–nutrient interactions that were not linked to dominant functional traits determined the consequences of warming on soil carbon. Taken together, I show clear and site-specific impacts of herbivores on vegetation and ecosystem carbon storage and the processes that govern them. Therefore, I suggest that an improved understanding of the role of herbivory in the global carbon cycle could improve estimations of global carbon–climate feedbacksTiivistelmä Vuosisadan loppuun mennessä arktisten alueiden lämpötilan odotetaan nousevan usealla asteella ja johtavan lajien siirtymiseen yhä pohjoisemmaksi. Nämä muutokset todennäköisesti muuttavat pohjoisten ekosysteemien kykyä vapauttaa ja sitoa ilmakehän hiiltä ja saattavat johtaa siihen, että yhä enemmän hiiltä vapautuu tundramailta ilmakehään. Kuitenkin paikallisesti hiilenkierto on riippuvainen kasviyhteisöstä ja erityisesti kasvien funktionaalisista ominaisuuksista. Väitöskirjassani tutkin, voivatko herbivorit, pääasiassa porot sekä jyrsijät, muokata hiilenkiertoa muuttamalla kasvillisuutta. Tutkimuksissani seurasin kuinka alueen laidunnushistoria on muokannut hiilivarastoja ja hiilenkiertoa tällä hetkellä ja pyrin arvioimaan herbivorien vaikutusta lämpenevässä ilmastossa kokeiden avulla, joissa manipuloidaan sekä herbivoriaa että lämpötilaa tai ravinteiden saatavuutta. Tulokseni perustuvat arvioihin hiilen varastoista, hiilidioksidin vapautumisesta ja sitoutumisesta sekä mikrobien aktiivisuudesta, joita vertaan kasviyhteisöön. Tulokseni osoittavat, että herbivoria voi joko lisätä tai vähentää ekosysteemin hiilivarastoja sekä maan päällä että maan alla. Muutokset hiilivarastoissa selittyivät varsin hyvin herbivorien tuottamilla kasvillisuusmuutoksilla ja valtalajien funktionaalisilla ominaisuuksilla. Herbivoria muokkasi kasviyhteisöä myös kokeellisen lämmityksen yhteydessä, mutta lämmityksen välittömät vaikutukset hiilivarastoihin peittivät suureksi osaksi alleen herbivorian vaikutukset. Kuitenkin herbivorian ja lannoituksen kasvillisuusmuutoksista riippumattomat yhdysvaikutukset määrittivät lämpenemisen seuraukset maan hiileen. Kaiken kaikkiaan, tutkimukseni osoittaa, että herbivorit voivat paikkakohtaisesti muokata kasvillisuutta, ekosysteemin hiilivarastoja sekä hiilenkierron prosesseja. Näiden tulosten myötä ehdotan, että parempi ymmärrys herbivorian vaikutuksista maailmanlaajuisesti voisi parantaa nykyisiä ennusteita siitä, kuinka ilmaston lämpeneminen muuttaa hiilenkiertoa
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Ruyle, George, Lamar Smith, and Phil Ogden. "Strategies for Managing Grazing Allotments on Public Lands." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1995. http://hdl.handle.net/10150/144725.
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Moreira, Vinicius Silva. "TERRITORIALIDADES RURAIS EM JÚLIO DE CASTILHOS RS: DA PECUÁRIA EXTENSIVA À AGRICULTURA FAMILIAR." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/9276.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorJúlio de Castilhos City has undergone significant transformations in its rural space last decades. It has happened because of large lands retraction and extensive cattle ranching in favour of Soya new agriculture. The partial fragmentation of cattle breeding and its reorganization has occurred in three main forms: land rent, land sell and expropriation when non-productive land. It was carried out by Instituto Nacional de Colonização e Reforma Agrária (INCRA) because they were not taking their social function. The rural settlements made possible the introduction and the development of family farm in Júlio de Castilhos City and consequently the diversification of agricultural production. This research aimed at understanding the processes held responsible for the dynamics of Júlio de Castilhos rural space and its resulting conflits from 1960 to 2007. Moreover, it was analyzed productive, landing and socioeconomic transformations responsible for the formation of rural lands. The methodology is analytical and descriptive, based on field researches, through observation and interviews with farmers, landowners and other qualified informants.
O município de Júlio de Castilhos sofreu transformações significativas em seu espaço rural nas últimas décadas. Isso ocorreu devido à retração do latifúndio, domínio da pecuária extensiva, em favor da agricultura moderna da soja. A fragmentação parcial dos criatórios de gado e sua reestruturação ocorreram através de três formas predominantes: o arrendamento, a venda das propriedades e a desapropriação das terras improdutivas, realizada pelo Instituto Nacional de Colonização e Reforma Agrária INCRA, pois não estavam exercendo sua função social. Os assentamentos rurais possibilitaram a introdução e o desenvolvimento da agricultura familiar no Município e a conseqüente a diversificação da produção agrícola. Compreender os processos responsáveis pela dinâmica do espaço rural do Município e os conflitos decorrentes, no período entre 1960 a 2007, analisando as transformações produtivas, fundiárias e socioeconômicas responsáveis pela formação dos territórios rurais constituem os objetivos desta pesquisa. A metodologia é analítica-descritiva, fundamentada em trabalhos de campo, através de observações e entrevistas com os agricultores e proprietários rurais, além de outros informantes qualificados.
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Gustafson, Tomas. "Bird communities and vegetation on Swedish wet meadows : importance of management regimes and landscape composition /." Uppsala : Swedish University of Agricultural Sciences, 2006. http://diss-epsilon.slu.se/archive/00001234/.
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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2006.Title from PDF file as viewed on 11/28/2006. Includes bibliographical references. Also available in print. Print version includes appendices.
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Oliveira, Tamara Esteves de. "Dinâmica da produção de alimentos no bioma pampa." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/163288.
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Esse estudo analisou a dinâmica da produção de alimentos no estado do Rio Grande do Sul e suas consequências para as alterações nas áreas de pastagens naturais no Bioma Pampa. Para tanto, foram analisadas as mudanças no uso da terra nos municípios conforme os Censos Agropecuários de 1975, 1985, 1995/1996 e 2006 e da produção de alimentos de acordo com os relatórios de produção agrícola e pecuária municipais do Instituto Brasileiro de Geografia e Estatística (IBGE). Para analisar as variações na área das culturas e quantidade produzida foi calculado um índice de crescimento relativo. Os municípios foram ordenados conforme a área das categorias em seu território e sua localização por Escalonamento Multidimensional Não Métrico (NMDS). A influência do bioma sobre o uso da terra foi analisada por ENVIFIT e a diferença entre as categorias por PERMANOVA, no software R. No Bioma Pampa ocorreu um decréscimo de 26% nas pastagens naturais desde 1975, apresentando decréscimo de até 12.5%, entre 1975 e 1985. Destacam-se as taxas das lavouras e matas artificiais, em que para lavouras temporárias, apresentaram um crescimento considerável de 1985 para 2005. A influência do Bioma Pampa na composição das categorias de uso da terra manteve-se entre 14 e 15%, havendo diferença entre municípios localizados no Bioma Pampa em todos os anos analisados. Ao longo do tempo foi possível observar uma movimentação significativa das lavouras temporárias e das matas artificiais que principalmente entre 1995 e 2005 começam a integrar a paisagem do bioma. Para enfrentar o desafio de manter atividades agroecológicas em biomas ameaçados o Brasil deve investir em fiscalização, desenvolvendo sistemas de monitoramento capazes de detectar sutis alterações no uso da terra. Por outro lado, a produção de alimentos nesse estado apresentou crescimento na quantidade produzida. Foi observado um crescimento elevado na quantidade produzida de soja, sendo distribuição homogênea em todo o estado. O arroz apresentou redução na quantidade produzida no norte do estado e uma concentração expressiva nas regiões sul e fronteira oeste do estado. Os bovinos mantiveram seu rebanho estável com grande concentração na fronteira oeste. A silvicultura apresentou crescimento em praticamente todo estado, estando sua produção centrada na região sudeste do estado. As lavouras analisadas contribuíram para o PIB do estado e são capazes, hoje e no futuro, de suprir as demandas calóricas do Rio Grande do Sul em caso de necessidades, caso sejam mantidas as características atuais do agronegócio gaúcho. Dessas culturas, a soja foi a que mais disponibilizou calorias e retorno financeiro ao estado, sendo capaz de suprir a demanda local e oferecer excedentes para a exportação. Em todas as culturas, com exceção do milho, o aumento da quantidade de calorias disponibilizadas esteve relacionado ao aumento da área plantada, demandando maiores investimentos e incentivos ao incremento do rendimento das culturas.This study analyzed the food production dynamics in the state of Rio Grande do Sul and its consequences for the changes in the natural grassland areas in the Pampa Biome. To this end, data for land use in the municipalities of Pampa Biome were collected from the Agricultural Censuses of 1975, 1985, 1995/1996 and 2006 as well as the food production data presented at the municipal agricultural and livestock reports published by the Brazilian Institute of Geography and Statistics (IBGE). To analyze the dynamics of the natural grasslands area of natural pastures, the micro-regions were compared every 10 years, the relative growth rate. The comparison between the municipalities was made by the adjusted mean the area allocated for the categories of land use. All municipalities were ranked as the area of the categories in its territory and its location by Multidimensional Scaling Not Metric (NMDS). The influence of the biome on land use was analyzed by ENVIFIT and the difference between the categories by PERMANOVA in Pampa Biome R. In software, there was a 26% decrease in natural pastures since 1975, presenting decrease of up to 12.5% between 1975 and 1985. Noteworthy are the rates of crops and artificial forest in which to temporary crops showed considerable growth from 1985 to 2005. The influence of the Pampa biome in the composition of land use categories remained between 14 and 15%, with significant differences between municipalities in the Pampa biome in all the years analyzed. Over time, it observed a significant movement of temporary crops and artificial forests that mainly between 1995 and 2005 begin to integrate the biome landscape. To face the challenge of maintaining agro-ecological activities threatened biomes in Brazil should invest in surveillance, developing monitoring systems capable of detecting subtle changes in land use. Moreover, the production of food in this state showed an increase in the amount produced. High growth for soy produced, being homogeneously distributed across the state was observed. Rice declined on the amount produced in the northern state and a significant concentration in the south and west of the state border. Cattle kept its stable herd with great concentration on the western border. Forestry grew in almost every state, with its production centered in the southeastern region of the state. The crops analyzed contributed to the state's GDP and are able, today and in the future, to meet the caloric demands of Rio Grande do Sul in the event purposes, if the current features of the gaucho agribusiness are maintained. These crops, soybean was the one that provided calories and financial return to the state, being able to meet local demand and provide surplus for exports. In all crops, except corn, increasing the amount of calories available was related to the increased planted area, requiring greater investments and incentives to increase crop yields.
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De, Marchi Tiago Closs. "Influência do gado e da monocultura de eucalyptus sp. em florestas ripárias do sul do Brasil." Universidade do Vale do Rio dos Sinos, 2011. http://www.repositorio.jesuita.org.br/handle/UNISINOS/3969.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
A mudança do uso da terra decorrente de atividades agrícolas provoca uma modificação na paisagem que leva à criação de fragmentos florestais isolados que se mantém imersos em uma matriz que pode apresentar uma maior ou menor agressividade de acordo com o seu uso. Este estudo foi realizado em duas fazendas vizinhas localizadas no município de Eldorado do Sul, RS. A Fazenda Terra Dura, pertence à empresa Celulose Riograndense S/A e a maior parte da área é utilizada para a monocultura de eucalipto (Eucalyptus spp.). Os remanescentes de floresta nativa estão exclusivamente associados aos diversos cursos d’água que cruzam a área e cercados pelo plantio de eucalipto de diversas idades e estágios de produção. A área é utilizada para o plantio de eucalipto há cerca de 30 anos e há 20 foi isolada do gado. A Fazenda Eldorado destina-se à criação extensiva de gado e sua cobertura vegetal é caracterizada por um predomínio de campo com fragmentos de florestas ripárias que o gado utiliza como local de pastejo e desedentação. Em cada uma das dez áreas selecionadas foram alocados dois transectos paralelos ao curso d’água a 20 metros de distância um do outro nos quais foram aleatorizadas cinco unidades amostrais de 10 x 10m para amostragem do componente arbóreo dos fragmentos. Em cada unidade amostral foram registradas a circunferência de todos os indivíduos com diâmetro a altura do peito maior ou igual a 5 cm (DAP ≥ 5cm). O componente juvenil foi amostrado em unidades amostrais de 5 x 5m concêntricas em cada parcela de 10 x 10m, onde foram amostrados todos os indivíduos com mais de um metro de altura e com menos de 5 cm de diâmetro e estimou-se sua altura total e seu diâmetro à altura do solo (DAS). A densidade e composição do estrato herbáceo foi amostrada em parcelas de 1 x 1 m concêntricas às unidades amostrais de 5 x 5 m. Nestas unidades amostrais foi removida toda vegetação de até 1 m de altura e identificadas taxonômicamente as espécies e separadas em formas de vida (árvore, arbusto, erva, gramíneas, pteridófita, trepadeiras, epífitos). Para avaliação do sub-bosque nos plantios de eucalipto foram selecionados quatro talhões onde foram alocados três transectos de 100 m de comprimento em diferentes distâncias da borda (5, 25 e 50 m) e dois transectos (5 e 25 m) para o interior da mata ciliar. Em cada transecto foram sorteadas cinco unidades amostrais de 5 x 5 m e amostrados todos os indivíduos juvenis utilizando os mesmos critérios anteriormente citados para este estrato. Nos fragmentos adjacentes aos plantios de eucalipto, foram encontradas 61 espécies para os adultos e 77 para os juvenis e o estoque de carbono estimado foi de 106 Mg.ha-1 para os indivíduos adultos e de 4,3 Mg.ha-1 para os herbáceos. Nas áreas com presença de gado foram amostradas 62 espécies para os adultos e 48 para juvenis, com um estoque de carbono de 85,5 Mg.ha-1 para adultos e 0,9 Mg.ha-1 para herbáceo. No sub-bosque dos plantios de eucalipto foram amostradas 32 espécies, sendo 16 exclusivas e 71 no interior da floresta ripária, com 55 exclusivas. Os resultados mostraram que florestas em pequenos fragmentos incorporados em plantações de eucalipto parecem ser melhor preservadas do que aqueles expostos à pecuária. Além disso, áreas com presença de gado apresentaram uma redução no estoque de carbono de 23,8% para o estrato arbóreo e de 79,4% no estrato herbáceo em relação às áreas sem a presença de gado. A plantação de eucalipto possui um importante papel, embora restrito devido ao curto período de corte das árvores, para a manutenção da diversidade de espécies de florestas nativas adjacentes em seu sub-bosque e podem atuar como uma catalizadoras da regeneração da vegetação nativa e na manutenção da diversidade local.
The change in land use due to agricultural activities causes a landscape change that leads to the creation of isolated forest fragments that remain embedded in a matrix that may present a greater or lesser aggressiveness according to their use. The environmental quality of this matrix can affect species composition and forest structure through several factors that impact the surrounding environment, but on the other hand, depending on its type, the array can act as an important source of biodiversity conservation. This study was conducted in two neighboring farms located in Eldorado do Sul, RS. Terra Dura Farm, owned by Celulose Riograndense S/A and most of the area is used for the monoculture of eucalyptus (Eucalyptus spp.). The remnants of native forest are exclusively associated with the various streams that cross the area and surrounded by eucalyptus plantations of various ages and stages of production. The area is used for the planting of eucalyptus during 30 years. The cattle was isolated 20 years ago. Eldorado Farm is intended for extensive cattle ranching and its vegetation is characterized by a predominance of field with fragments of riparian forests that livestock use for grazing. We survey ten riparian fragments, five in each farm, were allocated two transects parallel to the stream to 20 m away from each other in which five were randomized plots of 10 x 10 m sampling of the tree component of the fragments. In each sampling unit circumference were recorded for all individuals with diameter at breast height greater than or equal to 5 cm (DBH ≥ 5 cm). The juvenile component was sampled in 5 x 5 m plots concentric in each plot of 10 x 10 m was sampled all individuals with more than one meter in height and less than 5 cm in diameter and estimated its total height, and its diameter at ground level (DAS). The density and composition of the herbaceous layer was sampled in plots of 1 x 1 m plots of concentric to 5 x 5 m. In these sample units of all vegetation was removed up to 1 m high, which were taxonomically identified and separated in life forms (tree, shrub, herb, grass, fern, lianes and epiphytes). To evaluate the understory in the eucalyptus plantations were selected four plots were allocated three transects of 100 m length at different distances from the edge (5, 25 and 50 m) and two transects (5 and 25 m) into the riparian vegetation. In each transect were randomly selected five samples of 5 x 5 m and sampled all juveniles using the same criteria previously cited for this stratum. In fragments adjacent to eucalyptus plantations, 61 species were found for adults and 77 for juveniles and the estimated carbon storage was 106 Mg.ha-1 for adults and 4.3 Mg.ha-1 for the herbs. In areas with presence of cattle were sampled for 62 adults and 48 for juveniles, with a carbon stock of 85.5 Mg.ha-1 for adults and 0.9 Mg.ha-1 for herbaceous. In the understory of the eucalyptus plantations were found 32 species, with 16 exclusive and 71 within the riparian forest, with 55 exclusive. Our results showed that in small forest fragments embedded in eucalypt plantations seem to be better preserved than those exposed to livestock. In addition, areas with the presence of cattle showed a reduction in carbon stock of 23.8% for the upper stratum and 79.4% in the herbaceous layer compared to areas without the presence of livestock and the planting of eucalyptus has an important role, although limited, due to shortcut the trees for the maintenance of species diversity of native forest adjacent to their understory and can act as a catalyst of the regeneration of native vegetation and maintenance of local diversity.
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Kennedy, Pam J. "A study of Tunisian grazing lands using data from the advanced very high resolution radiometer." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329523.
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Kral, Katherine Claire-Ann. "Impact of Wildfire and Targeted Grazing Effects on Northern Great Plains Range and Pasture Lands." Thesis, North Dakota State University, 2015. https://hdl.handle.net/10365/27549.
Full textAbstract:
The Grand River District in South Dakota has a high proportion of underutilized crested
wheatgrass within native rangelands. Prescribed fire is rarely used for management; although, there is a
strong evolutionary relationship with fire and grazing. Our project entailed two studies, the first looking at
targeted grazing with cattle and second the effects of an April wildfire on plant species composition,
basal cover, and phytomass production. The wildfire and targeted grazing did not affect (p > 0.05) plant
species composition or phytomass production four and 16 months after treatment (MAT). Targeted
grazing increased (p ? 0.05) crested wheatgrass utilization, but did not reduce (p >0.05) basal or canopy
cover. Fire was ineffective (p > 0.05) at decreasing crested wheatgrass frequency. Fire increased (p ?
0.05) bare ground and decreased (p ? 0.05) litter cover four and 16 MAT. Multiple treatments may be
more effective at controlling crested wheatgrass.United States Forest Service
NDSU Extension Services
Grand River Grazing District
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Nhlengetfwa, Melusi. "A mathematical model of browse and herbage production in communal grazing lands of semi-arid regions." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/26527.
Full textAbstract:
The main purpose of this work is to extend an existing model of growing cattle and grass production in a semi-arid rangeland.The existing model which is basically Dye's (1983) model in differential equation form handles: i) the growth and performance of cattle measured in terms of weight, ii) the initiation of grass growth in early rainy season and its utilisation by the cattle . This model is being extended to simulate woody plants in addition to the grass and to simulate browsing by goats. The densities of vegetation and the stocking rates of both types of animals are being considered. Our model (SAVANNAS) will predict animal productivity in relation to rainfall and density of woody plants (or vegetation condition). A rainfall data file is being used to generate rain which divides into infiltration and run-off. Athough generally dry, semi-arid regions are agriculturally productive, more especially in terms of animal products. An understanding of the climatic conditions by the farmers is all what it takes. It is unfortunate that in these regions, rainfall, being the main driving force behind animal productivity, is unreliable in that it varies both within and over the years. It is in this regard, therefore, that models be built to simulate semi-arid environments. Such models, when run for several (semi-arid) representative rainfall years could be used by farmers. For instance, a model like SAVANNAS will be run for three rainfall years namely 1980/81, 1981/82 and 1982/83, which, respectively represent: very high, about average and very low rainfall (by semi-arid standards). SAVANNAS simulates processes that operate on widely different time scales. The growth and consumption of herbage and leaves and twigs of woody plants are modelled on a daily basis, while the numbers and ages of woody plants are updated every 120 days. The year is divided into four seasons, with the rainy season beginning in September and initiating herbage re-growth. SAVANNAS simulates herbage biomass, which means it allows the re-establishment of the previous year's grass plants . It divides woody plants into age cohorts with the first cohort being seedlings mainly, and the last cohort being adult trees which are usually out of the browsing range of herbivores. It is a model that has a focus on the effects of vegetation (woody plants and grass) on each other and the effects of the animals on vegetation and viceversa. Without overlooking their effects on vegetation production, fires are not considered in SAVANNAS. This is because in communal lands heavy grazing does not allow the accumulation of sufficient dry herbage for fuel.
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Snyman, Dirk. "A comparison of standard scientific methods and pastoralists’ perceptions of vegetation responses to livestock exclusion in Namaqualand, South Africa." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4208.
Full textAbstract:
Thesis (MSc (Conservation Ecology and Entomology))--University of Stellenbosch, 2010.ENGLISH SUMMARY: Protected areas do not always achieve the desired level of biodiversity conservation, while often reducing the welfare of indigenous communities by reducing availability of land for subsistence. Traditional agricultural landscapes are significant biodiversity refugia and can contribute meaningfully to conservation. Rangelands comprise one-third to one-half of the world’s terrestrial surface, providing livelihoods for around 220 million people, usually in a communal subsistence system. Colonial practices impinged on traditional land-use practices with far-reaching social and environmental impacts. This has resulted in management based on assumptions regarding vegetation dynamics and traditional lifestyles that are increasingly shown to be inaccurate. A comparison of a vegetation survey based on conventional scientific methods and a survey of the perceptions of pastoralists was undertaken to highlight differences and similarities between the two knowledge systems with the hope of providing guidelines for more sustainable land-use practices in the communal rangelands of Namaqualand, South Africa. Vegetation responses to removal of grazing pressure revealed complex interactions that do not correspond with the prevailing management paradigm. Rather than a predictive relationship between livestock and vegetation, environmental factors play a large role in determining plant composition, abundance and cover. Pastoralists’ perceptions reflected this complexity in rangeland resource dynamics. The impact of livestock on rangeland resource dynamics was perceived by herders to be secondary to a range of environmental and climatic factors. Both sets of results were at odds with the theories that currently govern management in this system. Studies in rangeland systems must take the complexity of the subject into account. Research into such socio-ecological systems must take a multiplicity of factors – social, environmental, economic, political and other – into account. Implications for management are that it is inappropriate to adhere strictly to the conventional, conservative strategies that are prescribed by conservation and agricultural authorities. Rather, a more flexible, opportunistic grazing strategy would allow the persistence of traditional subsistence livelihoods without serious negative consequences for biodiversity conservation.
AFRIKAANSR OPSOMMING: Die instelling van beskermde gebiede lewer nie altyd die gewenste vlak van biodiversiteitsbewaring, terwyl die welvaart van plaaslike gemeenskappe dikwels daaronder ly deur die afname in grond beskikbaar vir bestaanspraktyke. Tradisionele landboulandskappe is beduidende biodiversiteitshawens wat ‘n belangrike bydrae tot bewaring kan maak. Weivelde bevat ‘n derde tot ‘n helfte van die wêreld se landsoppervlakte en ondersteun rondom 220 miljoen mense, gewoonlik binne ‘n gemeenskaplike bestaansstelsel. Kolonialisasie het inbraak gemaak op tradisionele bestuurspraktyke, met verrykende sosialeen omgewingsimpakte. Dit het gelei tot bestuurspraktyke gebaseer op standpunte oor plantegroeidinamika en traditionele lewenswyses wat toenemend verkeerd bywys word. ‘n Vergelyking van ‘n plantegroei opname gebaseer op konvensionele wetenskaplike metodes en ‘n opname van die standpunte van veewagters is onderneem om die verskille en ooreenkomstes tussen die twee kennisstelsels uiteen te lê met die hoop om riglyne vir meer volhoubare bestuurspraktyke in die meentgronde van Namakwaland, Suid-Afrika te verskaf. Plantegroei reaksies tot die verwydering van weidingsdruk wys op komplekse interaksies wat nie ooreenstem met die heersende bestuursparadigma. Eerder as ‘n voorspelbare verwantskap tussen vee en plantegroei, omgewingsfaktore speel ‘n groot rol in die bepaling van plantgemeenskapsamestelling, -getalle en grondbedekking. Die veewagters se standpunte het hierdie kompleksiteit in plantegroeidinamika weerspiëel. Die impak van vee op die weiveldhulpbron is deur veewagters as sekondêr beskou teenoor ‘n reeks omgewings- en klimaatsfaktore. Beide stel resultate is in teenstelling met die teoriëe wat tans bestuur in hierdie stelsel bepaal. Studies in weiveldstelsels moet die kompleksiteit daarvan in ag neem. Navorsing oor hierdie sosio-ekologiese stelsels moet ‘n verskeidenheid faktore – sosiale-, omgewings-, ekonomiese-, politiese- en ander – in ag neem. Implikasies vir bestuur is dat dit onvanpas is om te volhard met konvensionele, konservatiewe strategiëe voorgeskryf deur bewarings- en landboukundige gesagte. ‘n Meer aanpasbare, voordeelnemende weidingsstrategie sal die voortbestaan van traditionele bestaanslewenspraktyke toelaat sonder ernstige negatiewe nagevolge vir biodiversiteitsbewaring.
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Ruuttula-Vasari, A. (Anne). "”Herroja on epäiltävä aina – metsäherroja yli kaiken”:metsähallituksen ja pohjoissuomalaisten kanssakäyminen kruununmetsissä vuosina 1851–1900." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514273605.
Full textAbstract:
Abstract A study is made of the dealings of the local people with the Board of Forestry in matters connected with the crown forests of Northern Finland in the 19th century, setting out from the creation of the Forestry Board, the establishment of its ways of working and its local impact on settlement and sources of livelihood. This state of tension was perpetuated by delays in implementation of the Great Partition and by the presence of cottagers and pioneer settlers living in the crown forests. One major question was whether these forests were intended primarily to serve the purposes of state forestry or of settlement in the north of Finland. An account is given of the attitude of the Forestry Board towards the traditional modes of forest use typical of the crown forests, including swidden cultivation, tar burning and the cutting of wood for domestic use. New information is presented on the part played by the Forestry Board in regulating swidden cultivation and tar burning. Another topic not previously addressed is illicit exploitation of the crown forests. This was common practice in the Tornio and Ii river valleys in particular, to the extent that forest wardens on the border with Sweden were supplied with pistols to deal with this threat. The sale of timber cut illegally from the crown forests to sawmills in both Finland and Sweden was widespread, and it was common in the Ii Valley to trade in the timber which the Forestry Board allowed private persons to cut as a form of relief to the poor. The grazing of livestock in crown forests was another bone of contention between Forestry Board officials and the local people, the controversy over cows and what damage they actually did to the crown forests continuing well into the 20th century and ultimately remaining unresolved. Similar disputes arose over spruces carrying beard lichen, on which the reindeer fed, once the demand for spruce pulpwood increased. The actions taking by the foresters in accordance with the law and the demands of their office aroused much criticism in Finland, and this polemic spread to the newspapers, the Diet and the literature of the day. It was the fate of the Forestry Board and its officials to become an object of suspicion and even downright hatred. Their interference with traditional sources of livelihood, modes of land use and ancient rights of exploitation was apt to give rise to friction and maintain an attitude of mistrust on both sides. The present work provides new explanations for the author Pentti Haanpää's famous saying, "Beware of fine gentlemen – and of foresters most of all", and modern forest management conflicts can be appreciated and understood better in the light of these eventsTiivistelmä Olen tutkinut metsähallituksen ja pohjoissuomalaisten kanssakäymistä ja suhteiden muotoutumista Pohjois-Suomen kruununmetsissä 1800-luvulla. Lähtökohtina ovat metsähallinnon perustaminen, toiminnan vakiinnuttaminen sekä metsähallinnon vaikutus paikallisiin elinkeinoihin ja asutustoimintaan. Kangertelu metsänhoidossa ja liiketoiminnan aloittamisessa sekä yhteenotot paikallisen väestön ja lehdistön kanssa sävyttivät metsähallinnon ensimmäisten vuosikymmenten toimintaa. Hidastunut isojako sekä kruununmetsiin hakeutunut asutus, kruununmetsätorpat ja uudistilat, ylläpitivät jännittynyttä suhdetta. Suuri kysymys oli, olivatko kruununmetsät valtion metsätaloutta vai Pohjois-Suomen asutusta varten. Tutkimuksessa myös selitetään, miten metsähallinto suhtautui perinteisiin, juuri kruununmetsiin suuntautuneisiin metsänkäyttötapoihin, kuten kaskenpolttoon, tervatalouteen ja puun kotitarvekäyttöön. Metsähallinnon osuus kaskeamisen ja tervanpolton ohjailussa nousee esille uudella tavalla. Kruununmetsien haaskaajat eli varkaat ovat myös ennen tutkimaton teema. Kruununmetsien varastaminen oli yleistä erityisesti Tornionjokilaaksossa ja Iijokilaaksossa. Ruotsin rajan läheisyydessä toimineet metsänvartijat jopa aseistettiin pistoolein metsävarkaita vastaan. Varastetun puutavaran toimittaminen niin Suomen kuin Ruotsin sahoille oli maan tapa. Iijokilaaksossa turvauduttiin metsähallinnon käsikauppa- eli lupapuihin, joista tuli köyhäinavun, mutta myös keinottelun muoto. Keinottelu varsinaisilla valtionmailla eli haku uudistilalliseksi vain puutavaran vuoksi, kuuluu myös Pohjois-Suomen metsähistoriaan. Eläinten laiduntaminen kruununmetsissä myös asetti metsähallinnon virkamiehet ja paikallisen väestön vastakkain. Vielä 1900-luvulla lehmä kruununmetsissä oli kiistan kohteena. Lopullista selvyyttä siihen, mitä vahinkoa lehmä teki kruununmetsille, ei saatu koskaan. Lisäksi porojen käyttämät luppopuut eli naavakuuset hiersivät suhteita tilanteessa, jossa kuusipuulle oli syntymässä kysyntää paperipuuna. Metsänhoitajat saivat kritiikkiä toimiessaan viran ja lain vaatimalla tavalla Pohjois-Suomessa. Metsäherroja polemisoitiin sanomalehdissä, valtiopäivillä ja kirjallisuudessa. Metsähallinnon ja metsäherrojen osana oli 1800-luvulla olla epäluulon ja suorastaan vihamielisyydenkin kohteena. Puuttuminen perinteisiin elinkeinoihin, maankäyttötapoihin ja muinaisiin tapaoikeuksiin synnytti kitkaa suhteisiin ja ylläpiti epäluuloa molemmin puolin. Pentti Haanpään teksti "Herroja on epäiltävä aina – metsäherroja yli kaiken" on saanut uutta, selittävää ainesta ympärilleen. Nykyiset metsäkonfliktit avautuvat paremmin ja tulevat ymmärrettävimmiksi 1800-luvun metsähistorian kautta