Siga este enlace para ver otros tipos de publicaciones sobre el tema: Forest Genetic Resources management.
Tesis sobre el tema "Forest Genetic Resources management"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores tesis para su investigación sobre el tema "Forest Genetic Resources management".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
1
Luong, Thi Hoan. "Forest resources and forestry in Vietnam". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-190600.
Texto completoResumen
Forest and forestland are important roles and sources of livelihood for the population living in or near forests and in mountainous areas of Vietnam. The objectives of this paper analysed the change in forest resource, and policy of forestry in Vietnam. In recent several years, forest area rapidly covered an average rate of 240,000 ha/year and had about 13.39 million hectares in 2010. It has contributed to the use of bare land, job creation and improvement of livelihoods for 25% of Vietnam’s population living in mountainous areas. Those results were the purpose of reforestation program and the production of wood industry in Vietnam. In this addition, government policies and regulations have provided a solid foundation for development of the forest plantations and conservation of forest ecosystems though forest land allocation and lease to organizations, households, and individuals. Therefore, the forest utilization has motivated by both environmental and commercial factors in Vietnam based on dividing into three forest categories special use, protection and production forests. However, the development strategy of forest management plan is the difficulties associated with conflicting land claims and boundary disputes due to the value of the established forestRừng và đất rừng đóng vai trò quan trọng và là nguồn sinh kế cho người dân sống trong hoặc gần rừng ở các khu vực miền núi của Việt Nam. Mục tiêu của nghiên cứu này phân tích sự thay đổi về tài nguyên rừng và chính sách về lâm nghiệp. Trong một vài năm gần đây, diện tích rừng bao phủ nhanh với tốc độ trung bình 240.000 ha/năm và có khoảng 13,39 triệu ha trong năm 2010 này đã góp phần vào việc sử dụng đất trống, tạo việc làm và cải thiện đời sống cho 25% dân số sống ở khu vực miền núi của Việt Nam. Kết quả này là mục đích của chương trình trồng rừng và sản xuất gỗ công nghiệp tại Việt Nam. Bên cạnh đó, chính sách và các quy định của chính phủ đã cung cấp một nền tảng vững chắc cho việc phát triển diện tích trồng rừng và bảo tồn hệ sinh thái rừng mặc dù rừng và đất rừng đã được giao và khoán cho các tổ chức, hộ gia đình, cá nhân. Vì vậy, việc sử dụng rừng đã thúc đẩy bởi hai yếu tố môi trường và thương mại ở Việt Nam, dựa trên phân loại rừng: rừng đặc dụng, rừng sản xuất và rừng phòng hộ. Tuy nhiên, chiến lược kế hoạch quản lý phát triển rừng có những khó khăn liên quan đến xung đột khiếu nại đất và tranh chấp biên giới do giá trị của rừng được thành lập
2
Chambers, Fiona Grace. "Co-management of forest resources in the NorSask Forest Management License Area, Saskatchewan, a case study". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ42326.pdf.
Texto completo
3
Perez-Verdin, Gustavo y Aregai Tecle. "Multiobjective Forest Management in San Miguel, Mexico". Arizona-Nevada Academy of Science, 2002. http://hdl.handle.net/10150/296592.
Texto completo
4
Whittet, Richard Robert. "Genetic resources of native tree species and their deployment under climate change". Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/31467.
Texto completoResumen
Current and emerging threats to trees and forest ecosystems require a re-evaluation of the way forest genetic resources are managed. Governments in the United Kingdom and elsewhere are committed to the restoration, expansion and creation of new woodlands. Tree populations are often adaptively differentiated from one another, so a key question underpinning the success of planting schemes is the choice of seed origin. A long held understanding is that locally sourced seeds will have the best opportunity to tolerate conditions of the planting site (local provenancing). However, the rate at which the environment is changing introduces a great deal of uncertainty into decision making and there is concern that climate change is proceeding at rates faster than those with which locally adapted trees would be able to cope. As such, there are suggestions that seed collected from areas already experiencing the anticipated future conditions will improve the adaptability of forests (predictive provenancing). This thesis investigated outstanding questions relating to the merits of the local provenancing and predictive provenancing approaches, and the practical implementation of seed sourcing policy in British forestry. The validity of existing seed zone boundaries used under local provenancing was analysed for ancient semi-natural Scots pine Pinus sylvestris L. forests of Scotland. Vegetation description and analyses of climatic covariates revealed that the existing series of seed zones used to guide selection of planting stock for restoration do not necessarily environmentally match seed sources to planting sites under current conditions. Additional disparity is introduced when edaphic variation (or proxies for this) is considered. To determine whether future adaptation under local provenancing may be restricted by limited pollen flow among populations of native Scots pine in Scotland, the timing of pollen production in five populations was estimated by repeatedly measuring strobilus development on a series of twenty trees over three consecutive springs. Differences in the mean predicted date of pollen production were found, with populations in the warmer west shedding pollen earliest each year, although the timing and differences in timing among populations varied from year to year, with shedding taking place earliest in the warmest of the three years and latest in the coolest year. A theoretical multi-patch, ecological genetic individual-based model (IBM) was developed to investigate the utility of different seed sourcing strategies (local versus non local provenance) and their capacity to help populations adapt to directional climate change. As well as being adapted to climate, which varied in a clinal pattern, individuals also had to be well adapted to the habitat conditions of the planting site in order to survive hard selection at the seedling stage. The model showed that population size of a new planting was reduced when planting stock adapted to the future conditions but not to current conditions was deployed. The differences were most severe when selection acted simultaneously on both the climate-related and the habitat-related phenotype. Finally, a series of in-depth qualitative surveys conducted with members of the domestic forest nursery and seed supply sector in Great Britain found that there are many difficulties associated with seed sourcing and the supply of trees. These problems arise due to a very limited ability to predict demand at the time of seed sowing, and lead to waste when demand is overestimated and importation of planting stock when demand is underestimated. Confidence and competitiveness in the domestic sector could be greatly improved by updating seed sourcing guidelines and by simplifying certain aspects of the process by which forest planting projects are funded.
5
Luong, Thi Hoan. "Forest resources and forestry in Vietnam: Review paper". Technische Universität Dresden, 2014. https://tud.qucosa.de/id/qucosa%3A29092.
Texto completoResumen
Forest and forestland are important roles and sources of livelihood for the population living in or near forests and in mountainous areas of Vietnam. The objectives of this paper analysed the change in forest resource, and policy of forestry in Vietnam. In recent several years, forest area rapidly covered an average rate of 240,000 ha/year and had about 13.39 million hectares in 2010. It has contributed to the use of bare land, job creation and improvement of livelihoods for 25% of Vietnam’s population living in mountainous areas. Those results were the purpose of reforestation program and the production of wood industry in Vietnam. In this addition, government policies and regulations have provided a solid foundation for development of the forest plantations and conservation of forest ecosystems though forest land allocation and lease to organizations, households, and individuals. Therefore, the forest utilization has motivated by both environmental and commercial factors in Vietnam based on dividing into three forest categories special use, protection and production forests. However, the development strategy of forest management plan is the difficulties associated with conflicting land claims and boundary disputes due to the value of the established forest.Rừng và đất rừng đóng vai trò quan trọng và là nguồn sinh kế cho người dân sống trong hoặc gần rừng ở các khu vực miền núi của Việt Nam. Mục tiêu của nghiên cứu này phân tích sự thay đổi về tài nguyên rừng và chính sách về lâm nghiệp. Trong một vài năm gần đây, diện tích rừng bao phủ nhanh với tốc độ trung bình 240.000 ha/năm và có khoảng 13,39 triệu ha trong năm 2010 này đã góp phần vào việc sử dụng đất trống, tạo việc làm và cải thiện đời sống cho 25% dân số sống ở khu vực miền núi của Việt Nam. Kết quả này là mục đích của chương trình trồng rừng và sản xuất gỗ công nghiệp tại Việt Nam. Bên cạnh đó, chính sách và các quy định của chính phủ đã cung cấp một nền tảng vững chắc cho việc phát triển diện tích trồng rừng và bảo tồn hệ sinh thái rừng mặc dù rừng và đất rừng đã được giao và khoán cho các tổ chức, hộ gia đình, cá nhân. Vì vậy, việc sử dụng rừng đã thúc đẩy bởi hai yếu tố môi trường và thương mại ở Việt Nam, dựa trên phân loại rừng: rừng đặc dụng, rừng sản xuất và rừng phòng hộ. Tuy nhiên, chiến lược kế hoạch quản lý phát triển rừng có những khó khăn liên quan đến xung đột khiếu nại đất và tranh chấp biên giới do giá trị của rừng được thành lập.
6
Tecle, Aregai y Shafiu Jibrin. "Incorporating Fuzzy Logic and Stochastic Processes into Multiobjective Forest Management". Arizona-Nevada Academy of Science, 2011. http://hdl.handle.net/10150/296992.
Texto completo
7
Zewdie, Yihenew. "Access to forest resources and forest-based livelihoods in highland Kafa, Ethiopia : a resource management perspective". Thesis, University of Huddersfield, 2002. http://eprints.hud.ac.uk/id/eprint/4730/.
Texto completoResumen
Ethiopia's forest resource base, which is mostly found in the southwestern highlands, supports a multitude of agricultural production systems. However, similar to the trend in other parts of the developing world, deforestation has taken a heavy toll in this part of Ethiopia. Cognisant of this, recently policies and strategies have been devised that emphasise the need for citizens' participation in natural forest management. Yet, in Ethiopia there is little field-based analytical literature that throws light on the stake that villagers have in forest resources and the workings of local level forest access channels. Against this backdrop, the research examines state-community and intra-community relationships in the course of accessing forest resources under governments of widely differing political persuasions, and investigates the current importance of forests to the local household economy. This is achieved through a case study of six forest communities in a rural district of highland Kafa, southwest Ethiopia. The study employs a time line approach to trace the evolution of state-community interactions in the provision and administration of forest tenure at the local level. To this end, the research has examined the political history of Kafa and the land management policies of successive Ethiopian governments that had a bearing on local forest access and use. The broader themes of the research are informed by the literature on natural resource tenure establishment and household level forest use in agrarian systems and the discourse on management regimes in common pool resources. The research has established that throughout much of Kafa's history forests were accessed through customary tenure principles. However, following Kafa's incorporation into the Ethiopian State the central government became an important organ of forest allocation, and this situation favoured outsiders and local notables in acquiring private forest rights. The 1975 Land Reform decree extinguished all such claims, bestowed the State with exclusive land ownership rights, and created grassroots Peasant Associations (PAs) with a wide range of land administration roles. The PAs in some localities allocated village forests to rural households. Crucially, though, the State used its land ownership prerogatives to impose a range of measures that went contrary to the forest access interests of the local people. Formal state tenure notwithstanding, traditional principles and channels of forest access such as territoriality, patrilineal descent, and share cropping continue to play critical roles in the local tenure scene. These locally tailored mechanisms also command the protection and enforcement to which other formally recognised forest access channels have been accorded. The factors that permitted the co-existence of formal and informal means of access have also called for the involvement of traditional community-based organisations (CBOs) alongside state sponsored ones in the mediation of local access provision and dispute settlement. The empirical analysis underscores that local people stake forest resources with the view to producing forest goods, which are found to be important livelihood resources. Forest dependency, however, reflects the socio-economic differentiation existing in the study communities. The operational implications which the research draws are based primarily on the observed high degree of dependence of local people on the forest for their livelihoods and the communal ethos that characterise forest access provision and tenure enforcement. Finally, the influence of past patterns of access principles on the current situation; the divergent outcomes of the forest use process; and the local importance of forest goods has enabled the research to identify issues that would enrich the discourse on common property theory. These centre on the relevance of 'stewardship' in the study of resource access; the utility of examining inter-CBO interactions in the analysis of CPR access and management; the need to look beyond the 'tragedyTcomedy' dichotomy in the conceptualisation of resource management outcomes; and the desirability of re-orienting the discourse on CPR analysis towards development ideals contained in the notion of'the sustainable community'.
8
Roffler, Luke S. "Propagation practices and genetic resources in lake sturgeon rehabilitation /". Link to full text, 2009. http://epapers.uwsp.edu/thesis/2009/Roffler.pdf.
Texto completoResumen
Thesis (M.S.)--University of Wisconsin--Stevens Point, 2009.Submitted in partial fulfillment of the requirements of the degree Master of Science in Natural Resources (Fisheries), College of Natural Resources. Includes bibliographical references.
9
Lee, Myoung Ho. "An analysis and assessment of the regional forest resources : range sector". Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/24342.
Texto completo
10
Murphy, Edward Lancaster. "Contemporary muskellunge genetic resources in northern Wisconsin : impacts of supplemental stocking and genetic management zones /". Link to full text, 2009. http://epapers.uwsp.edu/thesis/2009/Murphy.pdf.
Texto completoResumen
Thesis (M.S.)--University of Wisconsin--Stevens Point, 2009.Submitted in partial fulfillment of the requirements of the degree Master of Science in Natural Resoueces (Fisheries), College of Natural Resources. Includes bibliographical references (leaves 91-96).
11
Eckerberg, Katarina y Camilla Sandström. "Preface to Forest Conflicts : A Growing Research Field". Umeå universitet, Statsvetenskapliga institutionen, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-71520.
Texto completo
12
Fiebig, Michael Thomas. "Place-Based Conservation Legislation And National Forest Management: The Case Of The Beaverhead-Deerlodge Partnership". [Missoula, Mont.] : The University of Montana, 2008. http://etd.lib.umt.edu/theses/available/etd-12232008-084030/unrestricted/Fiebig_Michael_Thesis_PDF.pdf.
Texto completoResumen
Thesis (M.S.) -- University of Montana, 2008.Title from author supplied metadata. Description based on contents viewed on June 20, 2009. ETD number: etd-12232008-084030. Includes bibliographical references.
13
Hamann, Andreas. "Utilization and management of red alder genetic resources in British Columbia". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ46351.pdf.
Texto completo
14
McNeil, Shannon Elizabeth. "Population Genetic Diversity and Structure in Yellow-billed Cuckoos across a Fragmented Landscape". Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/595973.
Texto completoResumen
Riparian ecosystems are disproportionately biodiverse and vital to many taxa despite their scant footprint on the landscape. Yet globally they are also under the greatest human-caused threats. The loss of habitat is the greatest driver of species declines, but fragmentation may also significantly impact populations by creating barriers to dispersal. Effective conservation requires an informed understanding of species' threats and capabilities, though it is unclear whether the increasing fragmentation of riparian woodland in western North America is affecting dispersal patterns of riparian breeding birds. Research suggests long distance migrants may be less impacted than resident species, though previous genetic research on the threatened western population of the yellow-billed cuckoo (Coccyzus americanus), a long-distance Neotropical migrant and obligate riparian breeding bird, suggests local structuring among isolated western populations. There is also interest in using more informative markers to assess genetic differentiation between eastern and western yellow-billed cuckoos. Despite limited differentiation found in mitochondrial sequences between eastern and western cuckoos, analysis of microsatellite markers is expected to reveal significant population structuring. Comparing 14 polymorphic microsatellite loci among seven separate populations in the west, and between western and eastern samples, I found limited population structuring, suggesting sufficient dispersal is occurring to maintain gene flow, both among isolated western, and between western and eastern populations. I found lower than expected heterozygosity across the range, possibly due in part to higher rates of inbreeding experienced by small populations, though the results were clouded by a high number of estimated null alleles downward-biasing estimates of heterozygosity. To test the accuracy of the microsatellites and measure scoring error, I compared microsatellites and mitochondrial sequences in nesting groups sampled from high-density restoration sites on the lower Colorado River. To identify the nesting males and females, I modified a universal avian sexing protocol, optimizing it for yellow-billed cuckoos. I calculated a scoring error rate of 2.12%, 0.91% not explained by null alleles. I also confirmed a relatively high rate of conspecific nest parasitism, with the nesting male apparently fathering the parasitic young in many cases. This is the first assessment of the relationships among breeding adults and nestlings of this species. With more nests providing more egg-dumping opportunities, the productivity of parasitic females should increase with larger populations of nesting cuckoos. Restoring more large patches of functional riparian woodland, to support multiple nesting pairs, could help to recover this declining population.
15
Kunje, Margaret Brenda. "An assessment of community based management of forest resources : a Malawi case study". Thesis, University of Reading, 2018. http://centaur.reading.ac.uk/78985/.
Texto completoResumen
Recently, approaches to natural resource management emphasize the importance of involving communities and institutions to build capacity, limit costs, and achieve environmental sustainability. Many developing countries have policy reforms and devolution programs allowing greater involvement of local communities to manage natural resources. However, implementation of these policies has many challenges which include unaccountable representatives, limited transfer of power and benefits. This study investigates how Local Forest Organizations (LFO) uses their devolved powers and responsibilities to manage resources on behalf of the people they represent. The principal focus of this thesis is an examination of the nature of institutional decision making at the communal level of forest management in Malawi. The conceptual frameworks and theoretical underpinnings used were the common pool resource theory, institutions, and governance concepts. Both qualitative and quantitative data collection methods were used in this study. Results show that 'bottom-up' approaches are an effective way to manage forest resources. 67% of the sampled LFOs manage and protect forest resources on customary land effectively and sustainably. Effective and sustainable LFOs are inclusive in their operations, have appropriate governance structures and receive support from traditional leaders. A number of Village Forest Areas (VFAs) have been established to promote regeneration and conservation of a variety oftree species which when managed properly will provide future livelihood security. The study observed that Indigenous Forest Management (IFM) has diffused to new members through community interactions and incentives for VF A Management. However, the mechanisms of transferring decision making powers as stated in the forestry policy are prohibitive in the sense that developed forest management plans (FMPs) have to go through a long approval process to become a Forest Management Agreement (FMA) hence, no FMA has been signed in the study area. The, LFOs could be supported to formulate FMP and enter FMA to effectively manage the VF As. Secondly, forestry based enterprises did not materialize as anticipated due to limited partnership between Non-Governmental Organizations and VNRMCs/LFOs. Absence of NGOs to support the effort of LFOs in the VF A management threatens the long-term sustainability of LFOs. The Forestry Department and NGOs need to adequately support community initiatives in capacity building, finance and provision of incentives. Forestry extension workers could be provided with the necessary skills and financial support to facilitate forestry activities.
16
Batista, Camila Moreira [UNESP]. "Variação, parâmetros genéticos e seleção entre e dentro de procedências e progênies de Handroanthus vellosoi (Toledo) Mattos". Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/98763.
Texto completoResumen
Made available in DSpace on 2014-06-11T19:29:42Z (GMT). No. of bitstreams: 0
Previous issue date: 2012-02-09Bitstream added on 2014-06-13T20:19:52Z : No. of bitstreams: 1
batista_cm_me_ilha.pdf: 351886 bytes, checksum: 7a32bba46398f3b30fabc1d91c4aac59 (MD5)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
A intensa fragmentação dos habitats de ocorrência de Handroanthus vellosoi (Toledo) Mattos já extinguiu grande parte das populações naturais da espécie. Essa exploração inadequada vem comprometendo sua capacidade de sobrevivência nesses ambientes naturais. Neste contexto, as finalidades deste trabalho são a conservação ex situ, avaliação da variabilidade e estimativa de parâmetros genéticos em teste de procedências e progênies de polinização aberta da espécie arbórea tropical Handroanthus vellosoi por caracteres quantitativos. Mais especificamente, pretende-se estudar a herança de caracteres quantitativos, a correção entre estes caracteres e selecionar árvores superiores de H. vellosoi em um teste de procedências e progênies para a produção de sementes com ampla variabilidade genética para fins de recuperação ambiental. O teste foi instalado na Estação Experimental de Luiz Antônio, do Instituto Florestal de São Paulo em 1986. O delineamento experimental adotado foi o de blocos de famílias compactas, com seis repetições, com subparcelas lineares de cinco plantas provenientes de duas procedências, 17 progênies de polinização aberta de Bebedouro e 18 de Mogi Guaçu, obedecendo ao espaçamento de 3 x 3 m. O ensaio foi mensurado aos 24 anos de idade para diâmetro à altura do peito, altura de planta, volume, forma do fuste e sobrevivência. Para as análises estatísticas foi utilizado o programa estatístico SAS. As estimativas da diferenciação genética entre e dentro de procedências e progênies indicou que a maior parte da variação genética se encontra entre progênies
he intense fragmentation to of the habitat that Handroanthus vellosoi (Toledo) Mattos occur has extinguished much of the natural populations of the species. This exploitation is inadequate, compromising their ability to survive in these natural environments. In this context, the purposes of this study was the ex situ conservation, evaluation and estimation of the genetic variability and parameters in a open-pollinated provenance and progeny test of the tropical tree species Handroanthus vellosoi, based on quantitative traits. More specifically, we intend to study the inheritance of quantitative thaits, the correction between traits and to select superior trees of H. vellosoi for to seed production with wide genetic variability for environmental remediation. The provenance and progeny test was established in 1986 at the Experimental Station of Luiz Antônio, São Paulo Forestry Institute. The trial was established in a compact family block desing with six replicates, linear plots of five plants, using two provenances, 17 families from Bebedouro and 18 from Mogi Guaçu. The spacing used was the 3 x 3 m. The test was measured at 24 years of age to diameter at breast height (DBH), plant height, volume, stem forma and survival. The statistical analysis was performed using the SAS program. The estimates of genetic differentiation between and within provenances and progenies indicated that most of the genetic variation is found among progenies
17
Poff, Boris. "The Cost Effectiveness of Multi-Objective Forest Management in the Wildland Urban Interface". Arizona-Nevada Academy of Science, 2001. http://hdl.handle.net/10150/296579.
Texto completo
18
Perez-Verdin, Gustavo y Aregai Tecle. "A Spatial and Temporal Multiobjective Forest Management Analysis in Ejidos of Durango, Mexico". Arizona-Nevada Academy of Science, 2006. http://hdl.handle.net/10150/296661.
Texto completo
19
Kamau, Peter Ngugi. "ANTHROPOGENIC FIRES, FOREST RESOURCES, AND LOCAL LIVELIHOODS AT CHYULU HILLS, KENYA". Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1374078802.
Texto completo
20
Aga, Esayas. "Molecular genetic diversity study of forest coffee tree (Coffea arabica L.) populations in Ethiopia : implications for conservation and breeding /". Alnarp : Dept. of Crop Science, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200579.pdf.
Texto completo
21
Adams, Alison. "Methods for the spatial modeling of forest carbon in the Northern Forest". ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/632.
Texto completoResumen
The ability to accurately assess forest carbon storage is critical to understanding global carbon cycles and the effects of changes in land cover on ecological processes. However, existing methods for calculating carbon storage do not explicitly account for differences in carbon stored by different species of trees. Those methods that do reflect some of this variability, such as remotely-sensing canopy structure to estimate biomass, can be resource-intensive and difficult to reproduce over past or future time steps in order to assess change. I examined the accuracy of several carbon mapping approaches to understand how specificity of forest type classification (for example, classifying forest as "sugar maple/birch" versus simply "deciduous") affects landscape estimates of forest carbon storage in the northeastern United States. I constructed three distinct models to estimate aboveground and coarse roots forest carbon across the study region. These models varied primarily in the specificity of forest type classifications in the input maps and the corresponding carbon storage estimates used for each type. The forest classification schemes tested, from highest to lowest specificity, were: 1) relative basal area by species, 2) species association classes, and 3) coarse forest types (in accordance with IPCC (2006) guidelines). The specificity of forest type classifications in the input maps did influence results, with higher carbon storage estimates generated by models using coarser forest classifications. Maps generated by models that included relative basal area or species association classifications had similar means and standard deviations to the validation plots, as well as the highest correlations with 1000 random points from a remotely-sensed biomass map, suggesting that they better represent variability in carbon storage across the region; however, this variability was largely driven by the incorporation of stand age. Error increased at higher elevations, and decreased with higher total maple-beech-birch components. This likely reflects the dominance of low elevation hardwoods in the studies on which carbon storage estimate tables are based and demonstrates the importance of matching input estimates to region-specific studies. Current estimates of forest carbon storage from the US Forest Service predict 84-90 Mg/ha in this study area, a low value when compared with my modeled estimates of 104 Mg/ha, 108 Mg/ha, and 118 Mg/ha from the relative basal area, species association, and high IPCC models, respectively. If IPCC carbon estimates are to be applied in the northeastern US, the high end of these ranges should be used. Carbon storage estimates that consider different carbon storage capacities of different tree species are useful to explore temporal trends and relative spatial patterns in carbon storage across heterogeneous landscapes, but because of the coarse resolution and low accuracy of existing stand age maps, remotely-sensed biomass maps may be a better approach to quantify carbon stored at specific locations.
22
Cowart, Alan E. y Michelle Baldonado. "EFFICIENT MANAGEMENT AND CONTROL OF TELEMETRY RESOURCES". International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608528.
Texto completoResumen
International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, NevadaIn recent years the telemetry community has encountered a growing demand for bandwidth from users and a corresponding loss of spectrum. The Advanced Range Telemetry (ARTM) Program has responded to this situation with an initiative to develop, demonstrate, and improve the management and control of telemetry resources using demand assigned multiple access (DAMA) techniques. This initiative has proceeded along two paths. The first path is in the development of an expert system to facilitate the scheduling of telemetry missions and the deconfliction of their frequencies. This system emphasizes the graphical manipulation of mission data and uses a genetic algorithm to search for an optimal set of mission frequencies. The second path is the development of a bidirectional command and control link to remotely control and configure the frequency of a telemetry link. This link uses the simple network management protocol (SNMP) over a wireless Internet Protocol (IP) network implemented with Digital Communications Network System (DCNS) units.
23
Jemison, Roy. "PROTECTING WATER QUALITY ON NATIONAL FOREST IN THE SOUTHWESTERN U.S. WITH BEST MANAGEMENT PRACTICES (BMPS)". Arizona-Nevada Academy of Science, 2015. http://hdl.handle.net/10150/621697.
Texto completoResumen
The USDA Forest Service Southwestern Region (FS) manages over 20.5 million acres of forests and grasslands in Arizona, New Mexico and the Texas and Oklahoma panhandles. Water is one of the most beneficial natural resources used on and off these lands by humans, animals and plants. Water on forest and grasslands generally comes from precipitation which arrives in the form of snow or rain, depending on the location and season. On the ground, water infiltrates, ponds, runs off or evaporates, depending on the surface and climatic conditions. In general, precipitation that falls on these lands is free of pollutants. As water moves across and through soils, rocks and other materials it can become polluted by the surfaces it comes in contact with and by materials added to it. Materials added to flowing water in small amounts over time may have little to no harmful effects on the quality of the water. In large amounts and or concentrated, it can be extremely harmful to the quality of the water and users of the water. Common impacts to water quality include increases in temperature, turbidity, nutrient levels and hazardous chemicals. Sources of pollutants on forests and grasslands can be natural and human introduced. Natural sources and causes of pollution can include soil erosion, wildlife waste, concentrations of naturally occurring materials, drought, and flooding. Human sources and causes of pollution can include runoff from roads, trails, tree harvest areas, recreation sites, sewage facilities, livestock, pesticide applications and fuel and chemical spills (USDA Forest Service 2000). A plethora of methods exist to minimize harmful impacts to water quality on forests and grasslands. In 1990, the FS Southwestern Region developed a core set of practices and procedures, that when properly implemented, can be effective at minimizing and mitigating harmful impacts to water quality. The practices and procedures are both administrative and physical, and are collectively referred to as Soil and Water Conservation Practices, also known as Best Management Practices (BMPs) (USDA Forest Service 1990). Even though these BMPs were designed by FS and state resource specialists in the Southwest, they often require adjustments to make them fit site-specific conditions. The BMPs used by the FS Southwestern Region are acknowledged as being effective control measures by the environment departments of the
states (Arizona and New Mexico) in which they were developed, as documented in Memorandum of Understandings (MOUs) that exist between the FS and the states.
24
Batista, Camila Moreira. "Variação, parâmetros genéticos e seleção entre e dentro de procedências e progênies de Handroanthus vellosoi (Toledo) Mattos /". Ilha Solteira : [s.n.], 2012. http://hdl.handle.net/11449/98763.
Texto completoResumen
Orientador: Miguel Luiz Menezes FreitasCoorientador: Mario Luiz Teixeira de Moraes
Banca: Alexandre Magno Sebbenn
Banca: Ananda Virgínia de Aguiar
Resumo: A intensa fragmentação dos habitats de ocorrência de Handroanthus vellosoi (Toledo) Mattos já extinguiu grande parte das populações naturais da espécie. Essa exploração inadequada vem comprometendo sua capacidade de sobrevivência nesses ambientes naturais. Neste contexto, as finalidades deste trabalho são a conservação ex situ, avaliação da variabilidade e estimativa de parâmetros genéticos em teste de procedências e progênies de polinização aberta da espécie arbórea tropical Handroanthus vellosoi por caracteres quantitativos. Mais especificamente, pretende-se estudar a herança de caracteres quantitativos, a correção entre estes caracteres e selecionar árvores superiores de H. vellosoi em um teste de procedências e progênies para a produção de sementes com ampla variabilidade genética para fins de recuperação ambiental. O teste foi instalado na Estação Experimental de Luiz Antônio, do Instituto Florestal de São Paulo em 1986. O delineamento experimental adotado foi o de blocos de famílias compactas, com seis repetições, com subparcelas lineares de cinco plantas provenientes de duas procedências, 17 progênies de polinização aberta de Bebedouro e 18 de Mogi Guaçu, obedecendo ao espaçamento de 3 x 3 m. O ensaio foi mensurado aos 24 anos de idade para diâmetro à altura do peito, altura de planta, volume, forma do fuste e sobrevivência. Para as análises estatísticas foi utilizado o programa estatístico SAS. As estimativas da diferenciação genética entre e dentro de procedências e progênies indicou que a maior parte da variação genética se encontra entre progênies
Abstract: he intense fragmentation to of the habitat that Handroanthus vellosoi (Toledo) Mattos occur has extinguished much of the natural populations of the species. This exploitation is inadequate, compromising their ability to survive in these natural environments. In this context, the purposes of this study was the ex situ conservation, evaluation and estimation of the genetic variability and parameters in a open-pollinated provenance and progeny test of the tropical tree species Handroanthus vellosoi, based on quantitative traits. More specifically, we intend to study the inheritance of quantitative thaits, the correction between traits and to select superior trees of H. vellosoi for to seed production with wide genetic variability for environmental remediation. The provenance and progeny test was established in 1986 at the Experimental Station of Luiz Antônio, São Paulo Forestry Institute. The trial was established in a compact family block desing with six replicates, linear plots of five plants, using two provenances, 17 families from Bebedouro and 18 from Mogi Guaçu. The spacing used was the 3 x 3 m. The test was measured at 24 years of age to diameter at breast height (DBH), plant height, volume, stem forma and survival. The statistical analysis was performed using the SAS program. The estimates of genetic differentiation between and within provenances and progenies indicated that most of the genetic variation is found among progenies
Mestre
25
Xabadia, i. Palmada Àngels. "Optimal management of natural resources. Accounting for heterogeneity". Doctoral thesis, Universitat de Girona, 2003. http://hdl.handle.net/10803/7699.
Texto completoResumen
Dynamic optimization methods have become increasingly important over the last years in economics. Within the dynamic optimization techniques employed, optimal control has emerged as the most powerful tool for the theoretical economic analysis. However, there is the need to advance further and take account that many dynamic economic processes are, in addition, dependent on some other parameter different than time. One can think of relaxing the assumption of a representative (homogeneous) agent in macro- and micro-economic applications allowing for heterogeneity among the agents. For instance, the optimal adaptation and diffusion of a new technology over time, may depend on the age of the person that adopted the new technology. Therefore, the economic models must take account of heterogeneity conditions within the dynamic framework.This thesis intends to accomplish two goals. The first goal is to analyze and revise existing environmental policies that focus on defining the optimal management of natural resources over time, by taking account of the heterogeneity of environmental conditions. Thus, the thesis makes a policy orientated contribution in the field of environmental policy by defining the necessary changes to transform an environmental policy based on the assumption of homogeneity into an environmental policy which takes account of heterogeneity. As a result the newly defined environmental policy will be more efficient and likely also politically more acceptable since it is tailored more specifically to the heterogeneous environmental conditions. Additionally to its policy orientated contribution, this thesis aims making a methodological contribution by applying a new optimization technique for solving problems where the control variables depend on two or more arguments --- the so-called two-stage solution approach ---, and by applying a numerical method --- the Escalator Boxcar Train Method --- for solving distributed optimal control problems, i.e., problems where the state variables, in addition to the control variables, depend on two or more arguments.
Chapter 2 presents a theoretical framework to determine optimal resource allocation over time for the production of a good by heterogeneous producers, who generate a stock externalit and derives government policies to modify the behavior of competitive producers in order to achieve optimality. Chapter 3 illustrates the method in a more specific context, and integrates the aspects of quality and time, presenting a theoretical model that allows to determine the socially optimal outcome over time and space for the problem of waterlogging in irrigated agricultural production. Chapter 4 of this thesis concentrates on forestry resources and analyses the optimal selective-logging regime of a size-distributed forest.
26
Rosvall, Ola. "Enhancing gain from long-term forest tree breeding while conserving genetic diversity /". Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5643-6.pdf.
Texto completo
27
Kvistad, Arne Ivar. "Why Do Some Areas Have Higher Density of Forest Grouse Than Others?" Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for biologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12794.
Texto completoResumen
Landscape and vegetation data were extracted from digital maps by use of GIS. These data together with predator and management related data collected from landowners and hunter's associations in Norway, were used as explanatory parameters in an analysis of density estimates of black grouse and capercaillie in a number of study sites in Norway. By habitat modeling the dominating wood type and the landscape heterogeneity of an area were identified as important factors affecting the black grouse populations. For the capercaillie the forest cover, proportion of blueberry forest and abundance of pine marten were appointed to be important factors.
28
Geng, Guoting. "Development of approaches to integrated water resources management". Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/3984.
Texto completoResumen
There is a growing need to manage water resources in a sustainable way, particularly in semi arid areas, with dramatic social and economic development as well as rapid population growth. Optimising water allocation in a river basin is an important aspect ensuring equitable and efficient water use. This research develops an optimisation approach (the Integrated Water Resource Optimisation model, IWRO) to optimise the conjunctive use of surface water and groundwater resources in a sustainable manner. The IWRO model is comprised of a surface water optimisation model (SWO) and the Tsinghua groundwater optimisation (TGO) model. These models employ Genetic Algorithms (GAs) to optimise water allocation. Application of a surface water optimisation (SWO) model incorporating a GA is demonstrated initially for a simple test case, through which the GA approach was validated against known solutions. Sensitivity analysis of different operators and parameters related to GAs was also carried out. The validated SWO model was then applied to a more complex system, the Shiyang River Basin in Gansu Province in China, to maximise equitable surface water supplies. On the groundwater side, the GA approach was applied with the existing Tsinghua groundwater model to optimise groundwater supplies with sustainability considerations. The results were compared with those from an existing model (the WEAP model), indicating that the IWRO model is capable of satisfying the objectives of equitable water allocation and groundwater sustainability set for it. In the context of Integrated Water Resources Management (IWRM), account must be taken of a wide range of social and environmental issues. Different scenarios were therefore designed for the Shiyang River Basin management. Various criteria in terms of economic, social, environment and water security were also indentified for further multi-criterion decision making analysis.
29
Sandström, Camilla, Katarina Eckerberg y Kaisa Raitio. "Studying conflicts, proposing solutions : Towards multi-level approaches to the analyses of forest conflicts". Umeå universitet, Statsvetenskapliga institutionen, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-71521.
Texto completo
30
Erstad, Hilde Hovland. "Bruk og forvaltning av skogressurser i Manang, Nepal /". Bergen : Institutt for Geografi, Universitet i Bergen, 2007. https://bora.uib.no/bitstream/1956/2253/1/Masterthesis_Erstad.pdf.
Texto completo
31
Fah, Lee Ying. "Genetic and ecological studies relevant to the conservation and management of some Bornean Calamus species". Thesis, University of Aberdeen, 1995. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU603181.
Texto completoResumen
Genetic variation in Calamus subinermis was investigated in a provenance cum progeny trial and a study on some quantitative morphological traits. These studies show that variation occurs within and among populations of the species. Genetic gain was estimated for provenance and family selection at a range of selection intensity based on some economic traits. A karyomorphological study on C. subinermis and C. caesius reveals little variation in the chromosome morphology between and within species. The flowering and fruiting phenology of C. subinermis, C. caesius, C. manan and C. trachycoleus was elucidated. Except for the relatively opportunistic C. subinermis, in which floral initiation occurred at about four-month intervals, flowering and fruiting of the Calamus species investigated exhibited a regular annual pattern. Unravelling of the pollination mechanism and floral biology of C. subinermis and C. caesius in this project enables understanding of the breeding system and is important in breeding programmes. Pollination mainly by small noctuid and pyralid moths, which have small foraging ranges, partly accounts for the observed divergence among geographically isolated populations of C. subinermis. The discovery of andromonoecy in C. subinermis, together with the potential bisexuality in the other generally dioecious calamoid genera, calls for modification in the present system of classification for the tribe Calameae, and has implications for natural and artificial pollination. Several rattan mensuration techniques were developed. Growth and yield models based on the Richards function were constructed for C. caesius. These techniques and models will contribute to the conservation with wise use of rattan resources. Recommendations for further research are given for attaining the goal of the project.
32
Martin, Adrian. "Participatory forest management in the Western Ghats of Karnataka, India : developing partnerships for the management of local natural resources". Thesis, Cranfield University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267194.
Texto completo
33
Salgado-Herrera, Miriam. "Characterization of Bacteria Community and Evaluation of Anthropogenic and Natural Disturbances in Surface Waters Quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico". Thesis, Universidad del Turabo (Puerto Rico), 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10285300.
Texto completoResumen
Characterization of bacteria community and evaluation of anthropogenic and natural disturbances in surface waters quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico. This doctoral dissertation research focused on the bacterial characterization, and evaluation of anthropogenic, and natural disturbances in the surface waters quality of the Sabana River in the Luquillo Experimental Forest in Puerto Rico. Monthly samples were taken at seven stations along the river during one year, and physicochemical factors such as temperature, pH, conductivity, DO and salinity were measured to explore their effect in the bacterial community. The effect of recreation was evaluated at El Puente, and at La Paila in the Sabana River, and at Puente Roto in the Mameyes River, from August 4 to September 8, 2012. Samples were collected up-river (before), on-site, and down-river (after) primary contact recreation activity. The number of bathers, and the temperature of the water were recorded. Also, four monthly sampling events were conducted under low flow conditions between May 2015 and August 2015, at two sites in the Sabana River impacted by non-point sources. Terminal restriction fragment length polymorphism (T-RFLP), pyrosequencing, and Colilert and Enterolert Test-System, were used for the bacterial community characterization. It was found that number of phylotypes of the bacterial community increases from upriver to downriver as anthropogenic disturbances proliferate along the river, and that bacteria are adapted or acclimated to in situ temperature, dissolved oxygen, conductivity, salinity and pH, therefore, show little variation in time and space. Pyrosequncing revealed that a total of 12 bacteria classes, 27 orders, 33 families, 82 genera and 186 species were found in the Sabana River. There is an increase in families and species through the three stations, with the largest amounts observed downriver at station # 7. Vogesella spp. was the most abundant specie at the three stations, with 59% at station # 1, 67% at station # 4, and 53% at station # 7. A significant positive and strong correlation was found between the amount of E. coli and the number of bathers at MPRS (R = 0.919; p-value = 0.027), which means that a high number of bathers coincides with a high concentration of E.coli.
Also, there is a significant positive and strong correlation between the concentration of Enterococci and the number of bathers at Pai.S (R is 0.908; p-value = 0.033). There were not significant differences between the bacterial community up-river, on site and down river of the two non-point sources.
34
Mäki-Petäys, H. (Hannaleena). "Conservation and management of populations in a fragmented forest landscape:behavioural ecology meets population genetics". Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514283482.
Texto completoResumen
Abstract
The effects of habitat loss and fragmentation on the genetic structure and vulnerability of populations strongly depend on the behaviour of a particular species. In this thesis, I examined the effects of forest fragmentation on genetic population structure with the aim of identifying and evaluating the different genetic and behavioural factors important for species conservation and management on different geographical scales. The species studied were the mound building red wood ants Formica lugubris and F. aquilonia, and a lekking bird, the capercaillie, Tetrao urogallus.
Habitat loss and fragmentation affected the genetic structure in both wood ants and capercaillie. In general, the effects were related to the time since fragmentation and to the level of habitat loss and isolation from the other existing populations. The loss of genetic diversity due to population fragmentation was less observable than the differences in population structure. The response to habitat fragmentation was further dependent on species characteristics such as dispersal and mating behaviour. Sociality affected the genetic vulnerability of wood ant populations by decreasing gene diversity, increasing inbreeding depression and restricting gene flow between subpopulations. The results on the capercaillie in turn suggested that lekking behaviour restricts dispersal of both sexes, thus elevating the occurrence of inbreeding between individuals.
The present study provided important information on species conservation and management in terms of better understanding species' biology and behaviour, as well as increased knowledge concerning the genetic issues that should be taken into account when planning conservation actions. By examining the genetic structure of the species it was possible to clarify the conservation status including the effective population size, the question of origin, and the genetic vulnerability (genetic diversity, inbreeding and inbreeding depression) of the populations and/or species. Overall, the results emphasised the importance of preserving the effective population size and the connectivity of habitat patches when planning species specific management strategies. There were great differences in conservation needs among the species, which should be taken into account especially in local management actions.
35
Andersson, Erik W. "Gain and diversity in multi-generation breeding programs /". Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5629-0.pdf.
Texto completo
36
kelly, patrick. "A COMPARTIVE ANALYSIS OF THE EVOLUTION OF FOREST MANAGEMENT IN THE UNITED STATES IN GENERAL, WITH A FOCUS ON OREGON, NORTH CAROL". Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2318.
Texto completoResumen
ABSTRACT The purpose of this paper is to evaluate and discuss the evolution of forest management practices in the United States. The paper discusses the trends in forest management that have occurred within the United States in general, and specifically within the western (Oregon) and southern (North Carolina and Florida) United States. The trends discussed include the three (3) to four (4) epochs of management and use that are generally accepted within the forest management literature, with the exception of North Carolina that is in the process of a fifth (5). The comparative analysis within the paper discusses the western model of management which tends to be distinctly different from the southern model in terms of regulatory approaches. The western model (i.e. Oregon) tends to be highly regulated, while the southern model is primarily voluntary, and quasi-regulatory in terms of using alternative mechanisms of regulation (i.e. Best Management Practices that regulate water quality). The paper also discusses the role of professionalism within the various forest services in each state, although the regulatory mechanism is the most important explanatory variable. In general, each state's forest services tend to be highly professional with licensing requirements, educational services and cooperative management. The two models are also distinctly different in terms of ownership, with Oregon being owned (nearly 50%) by the public, whereas the southern states are dominated by Nonindustrial Private Forest Owners (NIPF).M.A.
Department of Political Science
Arts and Sciences
Political Science
37
Ffolliott, Peter F. "A Brief Summary of a Report by the National Research Council on the Hydrologic Impacts of Forest Management". Arizona-Nevada Academy of Science, 2009. http://hdl.handle.net/10150/296677.
Texto completo
38
LoÌpez, Juan Carlos Flores. "Exploring the potential of sound management of forest and tree resources on cattle farms located in tropical dry forest of Guanacaste, Costa Rica". Thesis, Bangor University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432792.
Texto completo
39
Wedajoo, Aseffa S. [Verfasser]. "Microeconomics of Wild Coffee Genetic Resources Conservation in Southwestern Ethiopia : Forest zoning and economic incentives for conservation / Aseffa S Wedajoo". Aachen : Shaker, 2010. http://d-nb.info/1124365249/34.
Texto completo
40
[Verfasser], Aseffa Seyoum Wedajoo. "Microeconomics of Wild Coffee Genetic Resources Conservation in Southwestern Ethiopia : Forest zoning and economic incentives for conservation / Aseffa S Wedajoo". Aachen : Shaker, 2010. http://nbn-resolving.de/urn:nbn:de:101:1-201701292295.
Texto completo
41
Сотник, Ірина Миколаївна, Ирина Николаевна Сотник, Iryna Mykolaivna Sotnyk y Y. Kaminskaya. "Woodlot management as a part of integrated resource management: home study for Sumy region". Thesis, Sumy State University, 2014. http://essuir.sumdu.edu.ua/handle/123456789/36254.
Texto completoResumen
Forests are our wealth. That's why we need to care for and protect them. For this purpose it can be used the modern concept of woodlot management.
Sumy region with its area of 23,800 km2 is rich in forests. They occupied 17% of its territory [1]. In northern part of the region there are dominated mixed forests (pine, birch, oak), in the central and southern parts - island forests (mainly maple, ash, oak groves).Therefore rational use of forest resources by applying the concept of woodlot management is actual for Sumy region.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/36254
42
Papa, Michael J. "Effects of Silvicultural Management on Coast Redwood Forest Composition, Density and Structure in Santa Cruz and San Mateo Counties". DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/647.
Texto completoResumen
The multiple-objective exploratory study investigates effects of various silvicultural management regimes commonly applied to coast redwood (Sequoia sempervirens [D. Don] Endl.) forests in Santa Cruz and San Mateo Counties, California, USA. A temporary forest inventory was installed in 24 harvest origin stands and 4 natural origin stands throughout the study area (sample area = 1189 acres). Data from the systematic sample of 233 one-quarter acre nested cluster plots (sample intensity = 4.9%) rendered overall forest descriptions in terms of species composition, density, and structure. The common forestry measures of trees per acre (TPA), basal area per acre (BA), and quadratic mean diameter (QMD) were calculated from the "snapshot" data and stratified by species groups and diameter ranges/canopy layers.
Forest components were derived from the dataset by selecting specific groups within the forest as defined by the California Forest Practice Rules, literature, and common forestry groups (refer to the table below). An example of a forest component would be TPA of conifers from 2.1-14.0 inches DBH. In all, 162 forest components were analyzed through three research objectives: (1) general forest components, (2) small stem density and distribution, and (3) large stem density. The driving question behind the analysis is whether forest management is creating significantly different forest structure. If so, in which components of forest composition, density, and structure do those differences reside?
A mixed-effects linear model tested overall significance and Fisher's Least Significant Difference (LSD) method tested pairwise comparisons among the six management regimes. Each model was tested with a significance level of alpha = 0.05 (pairwise and experimentwise).
A fourth objective compared two methods of late successional forest (LSF) classification based on QMD measures of canopy layers and diameter ranges. The methods were compared via a paired-sample t-test. The two methods are significantly different, but the investigation of LSF classification led to an examination of the validity of current LSF policy. It is suggested that the minimum overstory QMD for LSF classification be increased from 24.0 to at least 30.0 inches DBH. Furthermore, it is recommended that landowner incentives should be implemented by the State of California to encourage promotion of LSF and its functional elements.
An underlying theme of all research objectives in this study is an examination of forest restoration management. Restoration management is intentional treatments that begin or accelerate recovery of a degraded ecosystem in regards to its integrity and sustainability relative to a reference condition, often defined culturally, historically, or ecologically (Society for Ecological Restoration 2004, Hobbs 2004, Hobbs and Norton 1996, Stanturf 2005). Results and conclusions were synthesized to discuss current restoration efforts in the redwoods. Recommendations for target stand densities and silvicultural methods are presented.
43
Turyahabwe, Nelson. "Local capacity to manage forestry resources under a decentralised system of governance : the case of Uganda". Thesis, Stellenbosch: University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/1321.
Texto completoResumen
Thesis (PhD (Forest and Wood Science))--University of Stellenbosch, 2006.This study aims at examining technical and institutional capacity in local organisations to manage decentralised forest resources in Uganda. Specifically the study assessed the roles, responsibilities, powers and legal instruments, incentives, facilities and human and fiscal resources of local organisations to undertake decentralised forest governance. Semistructured and key informant interviews were conducted in local organisations and legal and policy documents reviewed to ascertain strategies for implementing decentralised forestry. An inventory of selected forests was conducted to assess effect of decentralisation policy on the condition of forests in Uganda. Chi-square tests were used to show the factors that motivate local organisations to participate in decentralised forest governance. Tree species diversity and richness, density, diameter at breast height and basal area and sings of human disturbance were used to compare the condition of forests under local government and those under private and central government ownership. Similarity between the forests was assessed using a Two Way INdicator SPecies Analysis, while the differences in the composition and structural characteristics of trees among forest ownership categories were compared by oneway analysis of variance. Multiple regression analysis was used to show the influence of household pressure, forest size, the distance of the forest from roads and forest administrative office, and the market demand of the forest produce on the capacity of forest agencies to regulate timber harvesting. The findings reveals that local organisations supported devolved forest management functions such as forest monitoring, tree planting, environmental education, networking, collaborative and integrated planning, resource mobilisation and formulation of byelaws. The role of forestry in the livelihoods of the people, the desire to control forest degradation and access to forest revenue, donor and central government fiscal support were the most important incentives in decentralised forest management. However, limited capacity in terms of qualified staff, funds, facilities and equipment and inadequate decision-making powers over fiscal resources from forestry, inequitable distribution of forest revenue and unclear forest and tree tenure hindered decentralised forest management. The diversity and richness indices, density, diameter at breast height and basal area of trees were significantly higher in central forest reserves, intermediate in private and lower in local forest reserves. The frequency of human disturbances was significantly higher in local forest reserves than in private and central forest reserves. The variation in composition and structure of the local forest reserves is partly attributed to human disturbances. The capacity of the forest agencies to regulate forest resources use in the Mpigi forests was significantly affected by the size of forest, and its location in relation to the well-maintained roads, forest administrative office and the number of households in close proximity and the market demand of the forest produce. Large forests in close proximity to densely populated areas and far a way from roads and the forest administrative office were more affected by timber harvesting. The results demonstrated that local governments are not yet efficient in monitoring and regulating forest use and maintaining the condition of forests in Uganda. Local organisations need to play an increased role in the implementation of the Forest Policy, the National Forestry and Tree Planting and the Local Government Acts for successful decentralisation of forest management and to recruit more technical staff, strengthen internal sources of revenue and develop integrated forestry work plans. There is also a need for the central government to integrate and co-ordinate local and central interests, and facilitate a working relationship with local governments, civil society and the private sector involved in forestry. Forest owners and managers in the Mpigi forests and Ugandaâ s tropical forests in general need to manage human impacts so as to balance utilisation and conservation forest resources. There is need for longterm studies to fully understand the real significance of ownership on the composition and structure of the Mpigi forests and forests in other districts of Uganda.
44
O'Brien, Eleanor K. "Local adaptation and genetic variation in south-western Australian forest trees : implications for restoration". University of Western Australia. School of Animal Biology, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0132.
Texto completoResumen
[Truncated abstract] Spatial structuring of genetic variation is commonly observed in plant species due to limited dispersal and local adaptation. Intraspecific genetic variation has significant implications for ecological restoration because the source of seed or plants influences patterns of gene flow, and may affect performance if there is adaptive divergence among source populations. This study assessed quantitative trait variation, local adaptation and molecular variation within three common, widespread, long-lived forest tree species from south-western Australia to understand the distribution of intraspecific genetic variation and predict the consequences of seed transfer for restoration. The geographic distribution of quantitative trait variation of jarrah Eucalyptus marginata was assessed through measurement of 15-year-old trees grown in a provenance trial. Survival of trees from the northern jarrah forest was significantly higher than that of trees from southern jarrah forest provenances, where mean annual rainfall is much higher, but stem diameter at breast height (d.b.h.) of southern jarrah forest trees was greater, implying faster growth. D.b.h. of trees from within the northern jarrah forest also exhibited a positive relationship with mean annual rainfall, with maximum d.b.h. observed in trees from provenances in the high rainfall zone. These patterns may reflect selection for faster growth under high rainfall conditions or environmentally-induced parental effects. The percentage of trees bearing buds and flowers varied among latitudinal divisions. ... Neither genetic variation within nor among populations of any species could explain variation of emergence and establishment in reciprocal transplant trials. Collectively, the findings of this study suggest structuring of genetic variation in these species at a broad, rather than a very local, scale. This is expected for widespread, long-lived species, where extensive gene flow and temporal variation are likely to favour high within, relative to among, population genetic variation. However, there is evidence that the source of seed may have a significant influence on the success of restoration of these species, whether as a result of genetic variation among populations or due to other factors affecting seed quality. These results highlight the importance of integrating studies of molecular and adaptive trait variation when seeking to understand the causes and consequences of genetic variation within plant species and contribute to the development of seed sourcing practices for improved restoration success.
45
Franckowiak, Ryan Patrick. "Temporal dynamics of genetic variation within the Escanaba Lake walleye population : implications for managing the genetic resources of naturally recruiting walleye populations /". Link to Full-text, 2005. http://epapers.uwsp.edu/thesis/2006/Franckowiak.pdf.
Texto completo
46
Conver, Joshua. "Stochastic Fire Modeling of a Montane Grassland-Forest Landscape in the Valles Caldera National Preserve, New Mexico, USA". Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/217054.
Texto completoResumen
Montane ecosystems of the western United States have experienced dramatic changes in their fire regimes over the last 150 years. Fire behavior modeling enables understanding of how ecosystem changes have altered past fire regimes. The Valles Caldera National Preserve in the Jemez Mountains, northern New Mexico, contains one of the largest montane grasslands in North America. This area is used for multiple uses ranging from logging to grazing and recreation. These important ecosystems have experienced increased fuel loads and stem densities resulting from a century of fire exclusion and tree encroachment, resulting in potentially anomalous fire behavior. We investigated whether fire pathways tend to spread along the grassland-forest ecotone or if fire would spread directly across grasslands under extreme fire weather conditions. We used the program FlamMap to model fire behavior under a variety of weather and fuel conditions. Fire spread pathways and burn perimeters were computed for the 50th, 90th, and 99th percentiles of historic weather conditions. The results are compiled into a probability surface that represents the most parsimonious pathways of fire spread in this landscape. We found that pathways were related to the origin of ignition; fires tended to spread around the ecotone, facilitating fire spread to adjacent grasslands. These results, complemented with fire history studies in dendrochronology and empirical observations of the Las Conchas Fire in 2011, further the understanding of the role and dynamics of fire in maintaining the montane-grassland conifer ecotone, and can guide efforts to restore a landscape affected by the effects of fire exclusion.
47
Mala, William Armand. "Knowledge systems and adaptive collaborative management of natural resources in southern Cameroon : decision analysis of agrobiodiversity for forest-agriculture innovations". Thesis, Stellenbosch: University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1290.
Texto completoResumen
Thesis (PhD (Dept. of Forest and Wood Science))--University of Stellenbosch, 2009.ENGLISH ABSTRACT: This study aimed to analyze under which conditions the structure, organization and integration of knowledge systems can provide the implementation of adaptive collaborative management of natural resources under conditions of high biodiversity in the humid forest zone of southern Cameroon. The study specifically did the following: characterized sustainable slash-and-burn agriculture innovations; examined the influences of local perceptions of nature and forest knowledge management systems on adaptive slash-and-burn agriculture practices; analyzed the influences of the social representation of land use patterns and their local indicators on agro-ecological sustainability; characterised the biophysical dimensions of local management of agricultural biodiversity knowledge systems; analyzed how local agricultural biodiversity knowledge is used to adapt and to satisfy household consumption needs, market preferences, and sustainable livelihoods; examined the influences of local perceptions of climate variability for the ability and adaptive capacity of people to use local knowledge to deal with the effect of pests-diseases on crop yield, corrective management actions, and adaptive slash-and-burn agriculture management. The study was conducted in three blocks within the humid forest zone of southern Cameroon along a gradient of natural resource use management intensification and population density. Data were collected via structured and semi-structured interviews, multi-disciplinary landscape assessment and a review of secondary information. Chisquare tests were used to show how local knowledge influences - natural resource management at the forest-agriculture interface, while binary logistic regressions were used to understand the influences of biophysical and socio-economic factors on farmers’ decisions to domesticate tree species and to cultivate several crop cultivars. Fourteen research and development (R&D) themes were identified and found to be equally distributed among blocks but unequally distributed across technical, marketing and socio-organisational types of innovation. There was a gap between social demand and innovation offer. Innovations offered covered more technical issues, such as crop variety development, indicating their agricultural focus rather than the integration of forest and agriculture issues. The local perceptions of nature and forest resources are based on social representation of the vital space into components having a specific function for the social, physical and spiritual life of people. Needs of the human world determine the role of local forest knowledge systems in the interpretation and responses of the natural environment, and guide the trajectories of natural resource management practices. The management of agro-ecological sustainability is based on the local definition of well-being, social representation of space and on a multi-criteria approach combining bio-indicators such as plants, earthworm activities, age of vegetation or forest cover, soil colour and quality but it is also positively influenced by land use history, the use value of wild plant and crop species, the knowledge of crop qualities, the knowledge of interactions between crops, and between crops and other wild plant species, the tree size of tree species used, the future use of a current land use, the estimated land use for own use and market access.
AFRIKAANSE OPSOMMING: Die doel van hierdie studie was om te bepaal onder watter omstandighede die struktuur, organisasie en integrasie van kennissisteme kan bydra tot die implementering van aanpasbare deelnemende bestuur van natuurlike hulpbronne onder toestande van hoë biodiversiteit in die vogtige woudsone van suidelike Kameroen. Die studie het spesifiek die volgende gedoen: volhoubare kap-en-brand landboukundige ontwikkelinge gekarakteriseer; die invloede van plaaslike persepsies van die natuur en woudkennisgebaseerde bestuursisteme op aanpasbare kap-en-brand landboupraktyke ge-evalueer; die invloede van die sosiale verteenwoordiging van grondgebruikspatrone en hul plaaslike indikatore op agro-ekologiese volhoubaarheid ontleed; die biofisiese dimensies van die plaaslike bestuur van landboukundige biodiversiteitskennissisteme gekarakteriseer; geanaliseer hoe die plaaslike landboukundige biodiversiteitskennis gebruik word om aan te pas by en bevrediging te verkry vir huishoudelike gebruiksbehoeftes, marksvoorkeure en volhoubare bestaansbehoeftes; die invloede en gebruik van plaaslike kennis en persepsies van klimaatsvariasie beoordeel in die vermoë en aanpassingskapasiteit van mense om die effekte van siektes-peste op gewasproduksie, regstellende aksies en aanpasbare kap-enbrand landboubestuur te hanteer. Die studie is uitgevoer in drie blokke binne die vogtige woudsone van suidelike Kameroen langs ‘n gradient van natuurlike hulpbrongebruiksbestuursintensiteit en populasiedigtheid. Data is versamel deur gestruktureerde en semi-gestruktureerde onderhoude, multi-dissiplinere landskapsevaluering en ‘n oorsig van sekondere inligting. Chi-kwadraat toetse is gebruik om te wys hoe plaaslike kennis die bestuur van die woudlandbou konneksie beinvloed asook binêre logistiese regressies om die invloede te verstaan van biofisiese en sosio-ekonomiese faktore op die boere se besluite om boomsoorte te domestikeer en om verskeie gewaskultivars te kweek. Veertien temas in navorsing en ontwikkeling (N&O) was gelyk versprei tussen die blokke en ongelyk versprei tussen tegniese, bemarking en sosio-organisatoriese tipes innovering. Daar was ‘n gaping tussen sosiale aanvraag en innoveringsaanbieding. Innoverings het meer tegniese aspekte gedek, soos ontwikkeling van ‘n verskeidenheid gewasse, wat wys op ‘n landboukundige fokus eerder as ‘n integrasie van woud en landboukundige aspekte. Die plaaslike persepsies van die natuur en woudhulpbronne was gebaseer op sosiale verteenwoordiging van lewensbelangrike ruimte in komponente met ‘n spesifieke funksie vir die sosiale, fisiese en geestelike lewe van die mense. Behoeftes van die menslike wereld bepaal die rol van plaaslike woudkennissisteme in die interpretasie van en reaksie op die natuurlike omgewing, en rig die gebruik van hulpbronbestuurspraktyke. Die bestuur van agro-ekologiese volhoubaarheid is gebaseer op die plaaslike definisie van geluk, sosiale verteenwoordiging van ruimte en op ‘n multikriteria benadering wat bio-indikatore kombineer soos plante, erdwurmaktiwiteite, ouderdom van plantegroei- of woudbedekking, grondkleur- en kwaliteit, maar is ook positief beinvloed deur grondgebruiksgeskiedenis, die gebruikswaarde van natuurlike en gewassoorte, die kennis van gewaskwaliteite, die kennis van die interaksie tussen gewasse en tussen gewasse en natuurlike plantsoorte, die boomgrootte van boomsoorte wat gebruik word, die toekomstige gebruik van ‘n huidige grondgebruik, die beraamde grondgebruik vir eie gebruik en vir toegang tot die markte.
48
Herlin, Marine Claire Ghislaine. "Genetic management of Atlantic cod (Gadus morhua L.) hatchery populations". Thesis, University of Stirling, 2007. http://hdl.handle.net/1893/421.
Texto completoResumen
Intensive aquaculture of Atlantic cod is fast developing in both Northern Europe and Canada. The last six years have seen major improvements in the larval rearing protocols and husbandry techniques for this species. Although breeding programmes are currently being developed by both governmental and private institutions in the main cod producing countries (i.e. Norway, Iceland and Canada), most hatcheries still rely on the mass spawning of their own broodstock. Mass spawning tanks are complex systems where fish are left to spawn naturally and fertilised eggs are collected with the overflowing water, with little or no control over the matings of the animals. Few published studies in other commercial marine species (i.e. turbot and sole) have attempted to analyse the output from such systems using microsatellite markers and several parentage analysis software programs. A review of these publications exposed a lack of consistency in the methods used to analyse such complex datasets. This problem was addressed by carrying out a detailed comparison of two analytical principals (i.e. assignment by strict exclusion and assignment by probabilities) and four parentage software programmes (i.e. FAP, VITASSIGN, CERVUS and PAPA), using the DNA profiles, at 5 loci, from 300 cod fry issued from the mass spawning of a large hatchery cod broodstock tank (consisting of 99 fish). This study revealed large discrepancies in the allocation outcomes between exclusion-based and probability-based assignments caused by the important rate of typing errors present in the dataset. Out of the four softwares tested, FAP (Taggart, 2007) was the most appropriate to use for handling such a dataset. It combined the most conservative method of assignment with the most informative output for the results displayed. In an attempt to study the breeding dynamics in a cod commercial hatchery, parental contributions to five groups of 300 fry (from five single days of spawning and from two commercial mass spawning cod tanks) were analysed, based on the genotyping data from eight loci. The parentage results from the exclusion-based analyses revealed that, on a single day, at least 25 to 30% of the total breeding population contributed to fertilised eggs that resulted in viable offspring at 50 and 83 days post-hatch. Family representations were highly skewed - with the marked dominance of a few males - and effective breeding populations were consistently low (approx. 5% of the total breeding population). Parental contribution to a group of 960 codlings - produced following intensive commercial practices (i.e. including successive size gradings and mixing of batches) and belonging to a single graded group - was also analysed, based on the genotyping data from eleven loci. The effective breeding population size of the juvenile batch (c. 14% of the total broodstock population) was two to three times greater than the effective size observed on a single day of mass spawning. The per-generation rate of inbreeding was however relatively high, for this batch alone, at 2.5%. Based on these results, suggestions were made to manage hatchery cod broodstock populations and implement genetic selection. Early maturation of farmed cod in sea cages (at two or three years old) is a major concern for ongrowers. Understanding the mechanism(s) behind sex determination in cod would probably help the development of a method to control sexual maturation. In an attempt to elucidate sex determination in cod, a protocol to induce gynogenesis was developed. Gynogenetic fish were successfully produced by irradiating cod milt with UV and applying a cold shock (at -6oC) to newly fertilised eggs. However, due to poor survival during larval rearing, only one gynogenetic fish survived long enough to be sexed; not enough to conclude anything on the sex determination mechanism(s) in cod.
49
González, Díaz Patricia. "Development and maintenance of genetic diversity in Scots pine, Pinus sylvestris (L.)". Thesis, University of Stirling, 2018. http://hdl.handle.net/1893/27929.
Texto completoResumen
Forests are among the most important repositories of terrestrial biodiversity and provide a broad range of ecosystem services. During millennia, forests have changed, adapted and evolved under changing conditions. However, in the present century, forests are facing environmental changes at rates with no precedents. A major concern is the risk of declining forest genetic diversity, since genetic variation as the raw material underpinning adaptation is key in maintaining the resilience of forest ecosystems against environmental changes. Understanding the different processes responsible for developing and maintaining the genetic diversity of tree species is essential to better predict tree responses under new conditions. Therefore, this thesis aimed to determine how different forces interact to shape and maintain within and among population genetic diversity of Scots pine and what the implications are for conservation and management under forthcoming environmental conditions. From local to continental scales, I followed a multilevel approach, and found that (i) historic climate changes and geographical barriers have played an important role in shaping the extent and spatial distribution of current genetic diversity of Scots pine. Despite contemporary habitat reduction and fragmentation we found that (ii) high levels of neutral genetic diversity remain in the Scottish populations of Scots pine, with gene flow and specifically wind-driven gene flow dominating over genetic drift and preventing differentiation among the Scottish populations. However, (iii) considerable impacts in the spatial distribution of genetic variation have occurred as a consequence of intensive historical forest management practices. Furthermore, we found that (iv) substantial levels of adaptive genetic variation are present in the Scottish populations of Scots pine, likely a result of selective processes resulting from the different environments they live in, with highly heritable traits, although similar capacity for response through phenotypic plasticity to warming. The results of this thesis help to further disentangle the forces maintaining genetic diversity in one of most widespread conifers in the world, and improving predictions of likely range shifts and adaptation of the species in response to contemporary changes. The thesis provides some recommendations to conservation and management practices.
50
Eshete, Getachew. "Assessment of fuelwood resources in acacia woodlands in the Rift Valley of Ethiopia : towards the development of planning tools for sustainable management /". Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5638-X.pdf.
Texto completo