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1
Smith, Phil, Grahame Collier, and Hazel Storey. "As Aussie as Vegemite: Building the Capacity of Sustainability Educators in Australia." Australian Journal of Environmental Education 27, no. 1 (2011): 175–85. http://dx.doi.org/10.1017/s0814062600000161.
Повний текст джерелаАнотація:
AbstractVegemite, a thick, rich and salty product made from yeast extract, is a paste commonly spread on bread or toast in Australian households. This iconic product mirrors some of the unique aspects of this country. For example, Vegemite thinly spread is best. The population of this country is sparse across the wide lands, and the Australian environment with its thin soils, water shortages and intense climates, might also be described as spread thin. These aspects of context present challenges because Australia needs quality sustainability educators thick on the ground to deal with the many and diverse environmental issues.This paper describes the development of the Australian National Professional Development Initiative for Sustainability Educators (NPDISE) and how it was infuenced by the Australian context. Multiple challenges existed: the size of the country, its environmental conditions and rich biodiversity, distance and space between major centres, distribution of people and resources, understanding of and support for education, and three tiers of government – each with its own policies, programs and priorities. On top of this, the practice of sustainability education crosses multiple professional sectors and disciplines. All these challenges had to be taken into account.Research conducted by the Waste Management Association Australia in 2009 revealed that the needs of Australia's sustainability educators in overcoming many of these challenges were broadly consistent around Australia. This gave encouragement to the establishment of a national professional development approach for those working in the environmental education feld. This paper shows how four professional associations – Australian Association for Environmental Education, Waste Management Association Australia, Australian Water Association, and the Marine Education Society of Australasia – worked together for the frst time and approached these challenges whilst developing the NPDISE. A 1954 jingle said Vegemite would help children “grow stronger every single week”. The NPDISE represents a similar ethos with an emphasis on building the sector.
2
Mctainsh, GH, and NC Duhaylungsod. "Aspects of soil particle size analysis in Australia." Soil Research 27, no. 4 (1989): 629. http://dx.doi.org/10.1071/sr9890629.
Повний текст джерелаАнотація:
Analysis of the particle-size characteristics of a soil can provide valuable information on the processes and products of soil formation. Studies of loess soils world-wide have used particle size as a major criterion, however, in Australia the particle-size characteristics of parna (a t y e of loess with a high clay content) have not been measured in detail. A modified method of particle-size analysis is proposed which gives more accurate results and which may contribute to a better understanding of soil formation in general, and loess formation in particular, in Australia.
3
Rickert, KG, RH Sedgley, and WR Stern. "Environmental response of spring wheat in the south-western Australian cereal belt." Australian Journal of Agricultural Research 38, no. 4 (1987): 655. http://dx.doi.org/10.1071/ar9870655.
Повний текст джерелаАнотація:
The performance of the spring wheat cultivar Gamenya, the leading cultivar in Western Australia since 1968, was studied to identify key aspects of its response to the environment under typically dry conditions on two contrasting soil types: a heavy clay loam and a light loamy sand overlying clay in the Merredin region.In the rain-fed treatments the total water use was similar on both soils and was of the order of 240 mm. On the heavy-textured soil at high nitrogen, the foliage canopy developed more rapidly than on the light soil, resulting in earlier soil water depletion and haying off. Water use efficiencies of about 10 kg grain ha-1 per mm of water were similar to those reported for winter rainfall areas in south-eastern Australia. This suggests a greater degree of buffering against spring drought than is indicated by the high ratio of pre-anthesis to post-anthesis water use (3-4.7:l) relative to values of 2-2.7:l in other parts of the Australian wheatbelt. Data on the partitioning of dry matter indicated that this buffering of the harsh spring conditions at Merredin may be due to a greater contribution of assimilates from pre-anthesis storage, to grain filling. In dry environments, further critical evaluation is needed of the role of stored assimilates in grain formation.Faster canopy closure on the heavy soil resulted from a higher density of shoots and possibly larger leaves. This led to the suggestion that on heavier, more fertile soils, an ideotype with restricted tillering, may be higher yielding. By the end of the season ear bearing shoot densities and total water use were the same on both soil types, thus masking earlier important differences.
4
Shaw, R., L. Brebber, C. Ahern, and M. Weinand. "A review of sodicity and sodic soil behavior in Queensland." Soil Research 32, no. 2 (1994): 143. http://dx.doi.org/10.1071/sr9940143.
Повний текст джерелаАнотація:
The occurrence of sodic soils in Queensland is more related to soil genetic factors of the past than to the current rainfall pattern, with lower sodium accessions and smaller occurrence of saline lands than other areas of Australia. A soil sodicity map of Queensland is presented. On an area basis, 55% of soils in Queensland are non-sodic, 25% are strongly sodic and 20% are of variable sodicity. The map was prepared using exchangeable sodium percentage (ESP) values at 0.6 m depth from 2 009 soil profiles, as well as the soil boundaries of the 1:2000000 Atlas of Australian Soils maps (Northcote et al. 1960-68). There is general agreement with the earlier sodicity map of Northcote and Skene (1972). The relationships between exchangeable sodium and field-measured soil hydraulic properties and plant-available water capacity are discussed. Behaviour of sodic soils depends on the exchangeable sodium percentage, clay content, clay mineralogy and salt levels. The binary component particle packing theory has been used to explain soil behaviour and identify those soils most susceptible to sodium. Cracking clay soils with dominantly smectite mineralogy and high clay contents are less susceptible to a given ESP level, as determined by their hydrological behaviour, than soils of moderate clay content and mixed mineralogies. The sodicity and the salt content of an irrigation water are important in maintaining permeability of soils. The naturally occurring equilibrium salinity-sodicity relationships of a wide range of subsoils in Queensland is compared to the published relationships between stable permeability and decreasing permeability based on sodicity and salt content. Aspects of management of sodicity under dryland and irrigation are discussed.
5
Morand, David T. "The World Reference Base for Soils (WRB) and Soil Taxonomy: an appraisal of their application to the soils of the Northern Rivers of New South Wales." Soil Research 51, no. 3 (2013): 167. http://dx.doi.org/10.1071/sr12144.
Повний текст джерелаАнотація:
Few soil surveys in New South Wales have utilised international soil classifications. Extensive morphological and laboratory data collected during soil surveys in the Northern Rivers region provided a strong basis for correlation with the World Reference Base for Soil Resources (WRB), Soil Taxonomy (ST), and the Australian Soil Classification (ASC). Of the 32 reference soil groups comprising the WRB, 20 were present locally; nine of the 12 ST orders were present. After re-classification of soils, correlation of the ASC with the WRB and ST was undertaken. Soils not requiring extensive laboratory analysis for classification and sharing similar central concepts were the more straightforward to correlate. Several ASC orders have unique central concepts and were therefore difficult to correlate with any one WRB reference soil group or ST order/suborder. Other soils were difficult to correlate due to differences in definitions of similar diagnostic criteria. This is most applicable to soils with strong texture-contrast and those with natric conditions. Such soils are not adequately differentiated to suit the Northern Rivers conditions. Of the two international schemes, the WRB was easier to apply locally due to the relative simplicity of the scheme. Considering certain aspects of Australian soils would improve the applicability of the WRB as a truly international framework for soil classification and correlation. Amendments to both the ASC and WRB are suggested.
6
Murphy, Brian, and Peter Fogarty. "Application of the Soil Security Concept to Two Contrasting Soil Landscape Systems—Implications for Soil Capability and Sustainable Land Management." Sustainability 11, no. 20 (October 16, 2019): 5706. http://dx.doi.org/10.3390/su11205706.
Повний текст джерелаАнотація:
Soil security identifies global challenges and a series of dimensions that are necessary requirements to meet those global challenges using sustainable land management. The soil security concept is applied to two contrasting soil landscape systems with varying climate, landform and soil types. Previous methodologies for assessing land and soil capability are combined within the soil security conceptual approach. The land and soil capability methodologies are used to assess how the soil condition changes in response to the stresses and forcing associated with land management and land and soil degradation processes. It is the soil capability that defines how the soil condition changes between the reference state of the soil condition, or the genoform, and the soil condition under land use, or the phenoform. The conclusion is that soil capability, which is one of the dimensions used to apply the soil security concept, is a complex dimension and has several aspects or further facets to be considered to achieve sustainable land management. It is apparent that in assessing soil capability, the following facets are relevant. I: The capacity of the soil to provide ecosystem services to meet the global challenges outlined for Soil Security. II: The stability of the soil condition to land degradation processes resulting from the effects of land management practices and the environmental stresses on the soil. III: The capacity to recover following degradation. Facets II and III can be considered the resilience. An important conclusion is that the soil capability cannot be assessed without taking into account features of the landscape including climate and landform. Two examples from south eastern Australia of the application of these facets of soil capability to on-ground situations are presented. The Cowra Trough Red Soils in the Australian wheat belt are a set of soils, primarily contributing to meeting the global challenge of food security. The major degradation processes threatening the stability of these soils are water erosion and soil acidification. The Kosciusko National Park in the Snowy Mountains region is primarily contributing to meeting the challenges of water security for the irrigation industry in the Murray Darling Basins and energy security through the production of hydroelectricity. The set of soil landscapes also contributes to biodiversity protection and human health and well-being. The major degradation processes threatening the stability of these soils and their capacity to meet the global challenges are water and wind erosion. A major limitation is the poor capacity of these soils to recover once degraded. Identifying the main ecosystem services provided by the two examples, together with the major risks of land degradation can clarify extension, economic and policy aspects of sustainable land management for the two sets of soil landscapes. For the Cowra Trough Red Soils, management of water erosion and soil acidification are essential for maintaining the contribution of the area to food security. For the Kosciusko National Park, the control of water and wind erosion are essential to maintain the contribution of the area to water and energy security.
7
Buck, Stuart, Joe Rolfe, Craig Lemin, and Bernie English. "Adoption, profitability and future of leucaena feeding systems in Australia." Tropical Grasslands-Forrajes Tropicales 7, no. 4 (September 3, 2019): 303–14. http://dx.doi.org/10.17138/tgft(7)303-314.
Повний текст джерелаАнотація:
Keynote paper presented at the International Leucaena Conference, 1‒3 November 2018, Brisbane, Queensland, Australia.Leucaena (Leucaena leucocephala ssp. glabrata) is a highly palatable and productive forage used mainly by beef producers on extensive properties in northern Australia. When sown into native or sown grass pastures, leucaena provides significant production, economic, environmental and social benefits. Adoption of leucaena was slow initially due to a range of technical, agronomic and landscape factors. These have now been largely overcome through extensive research, development, producer experience and other advances, resulting in around 130,000 ha of cultivated leucaena being utilized across northern Australia.A range of aspects will need to be addressed if the adoption of leucaena is to be accelerated into the future. These include environmental concerns, especially potential weediness, and a range of technological needs, including soil nutritional requirements, grazing and toxicity management, opportunities for companion fodder systems and conservation options. Advances in technology and the ongoing need for a high-quality, profitable and sustainable perennial forage will ensure the continued adoption of leucaena across northern Australia for the foreseeable future.
8
Hick, PT, and WGR Russell. "Some spectral considerations for remote sensing of soil salinity." Soil Research 28, no. 3 (1990): 417. http://dx.doi.org/10.1071/sr9900417.
Повний текст джерелаАнотація:
The National Soil Conservation Program (NSCP) and CSIRO funded a research project titled Remote Sensing of Agricultural Salinity, which gathered field and airborne reflectance data for study sites in areas of dryland agricultural salinity in Western Australia. Multivariate techniques are employed to analyse these data gathered over a 3-year period to determine optimum, spectral and temporal considerations for maximizing information content. This report concentrates on some of the spectral aspects and concludes that: spectral bands, existing in currently available remote sensing systems, may not be optimal for the delineation of salinity; that volunteer vegetation indicated the impact of increasing salinity; and that minor amounts of soluble salts in surface soils will modify spectra. The usefulness of portable field spectroradiometers and airborne scanning systems are also assessed for the discrimination of areas of land in the early stages of the effects of salinization.
9
Bowman, DMJS, and PR Minchin. "Environmental Relationships of Woody Vegetation Patterns in the Australian Monsoon Tropics." Australian Journal of Botany 35, no. 2 (1987): 151. http://dx.doi.org/10.1071/bt9870151.
Повний текст джерелаАнотація:
Indirect gradient analysis was applied to 48 vegetation samples taken from a mosaic of woody vegetation at Berry Springs in the Northern Territory of Australia. Compositional variation among the samples was effectively summarised by a two-dimensional ordination by non-metric multidimensional scaling. Subsequent rotational correlation analysis revealed marked relationships between the vegetation pattern and edaphic variables which reflect two aspects of the moisture regime: water availability during the dry season and the degree of inundation during the wet season. Moisture availability is principally determined by topographic position, through its relationship with soil texture and water table depth. Poor drainage during the wet season appears to separate Melaleuca communities from those dominated by eucalypts. Shrubby and grassy open forests appear to be differentiated by the intensity of the winter drought. The grassy understoreys, which occur on upslope positions well above the water table, die off shortly after the end of the wet season thus providing fuel for fires. A closed Carpentaria forest, located on the slopes above a spring, was found to have relatively organic-rich, fertile, fine-textured soils, possibly reflecting the superior nutrient cycling of the closed forest compared with the frequently burnt surrounding open communities. We suggest that the dense evergreen vegetation presents a barrier to fires from the open communities. This would account for the greater proportion of woody, closed forest species that regenerate exclusively from seed. The fires in the eucalypt forests are of low intensity and plants have vegetative mechanisms to recover from damage. We conclude that the edaphically determined vegetation controls fire regime rather than the converse.
10
Lattimore, MAE. "Pastures in temperate rice rotations of south-eastern Australia." Australian Journal of Experimental Agriculture 34, no. 7 (1994): 959. http://dx.doi.org/10.1071/ea9940959.
Повний текст джерелаАнотація:
Legume-based pastures have long been an integral part of rice growing in the southern New South Wales irrigation areas and still offer potential to improve the productivity, profitability, and sustainability of the temperate rice-cropping system.This paper reviews both historical and current aspects of pastures in temperate rice rotations in southern New South Wales and highlights the importance of pastures in sustaining this cropping system as environmental pressures increase. Topics discussed include pasture species and rotations, their role in improving soil fertility and sustainability, the value of pastures in weed control, and their management for maximum profitability.
11
Loch, RJ. "A method for measuring aggregate water stability of dryland soils with relevance to surface seal development." Soil Research 32, no. 4 (1994): 687. http://dx.doi.org/10.1071/sr9940687.
Повний текст джерелаАнотація:
This paper examines the potential for a test of aggregate stability-or more correctly, of the water-stable size distributions resulting from wetting-to be correlated with surface seal development and infiltration of rainfall under field conditions. Aspects of measurement of water stable aggregation considered include wetting method, sample depth, area, antecedent water content, and the use of whole soil rather than restricted dry aggregate size ranges, and the water stable size fractions likely to restrict water entry and form surface seals. From consideration of pore sizes likely to prevent direct entry of raindrops into the soil, it is concluded that surface seal development is likely to be related to the proportion of particles <100 �m. For the northern cereal growing areas of eastern Australia, essential features of a method for studying aggregate stability of dryland soils are: (a) wetting of air-dry soil by simulated rain with kinetic energy close to 29 J m2 mm-1 and intensities of 85-100 mm h-1 for at least 20 min; (b) the wetting applied to field or laboratory plots of 'whole soil' rather than selected dry aggregate sizes, with plots at least 0.36 m2 in area, and laboratory plots being approximately 100 mm deep; (c) samples of the compacted surface layer under high energy rain (to a depth of 3-5 mm) taken with a spatula; (d) size distribution measured by sieving in tap water using a modified Yoder wet sieving apparatus, a nest of sieves with minimum aperture of 0.125 mm, and material passing through the finest sieve collected and weighed; no distinction being made between aggregates and primary particles. Subsequent papers will deal with validation of the proposed test and its use to consider effects of tillage management on water stability.
12
Scott, B., P. G. Ranjtih, S. K. Choi, and Manoj Khandelwal. "Geological and geotechnical aspects of underground coal mining methods within Australia." Environmental Earth Sciences 60, no. 5 (August 5, 2009): 1007–19. http://dx.doi.org/10.1007/s12665-009-0239-6.
Повний текст джерела
13
Smyth, A., M. Friedel, and C. O'Malley. "The influence of buffel grass (Cenchrus ciliaris) on biodiversity in an arid Australian landscape." Rangeland Journal 31, no. 3 (2009): 307. http://dx.doi.org/10.1071/rj08026.
Повний текст джерелаАнотація:
Buffel grass [Cenchrus ciliaris L. syn. Pennisetum ciliare (L.) Link] is an exotic species that has been widely planted in Australian arid and semi-arid grazing lands, and has become an important resource for livestock. It establishes readily and has expanded into such a diversity of land types beyond grazing lands that it is also regarded as a serious environmental weed. Although there is an abundance of literature on the production benefits of buffel grass, there is relatively little about its influence on native flora and fauna in arid Australia, particularly when its cover levels are low. This study attempted to clarify the influence of buffel grass and environmental patterns on the occurrence of ground vegetation, birds, reptiles and ants in a gneissic hill habitat in central Australia where buffel grass has encroached. Despite poor conditions for growth, we were able to distinguish the influence of buffel grass from that of other variables like overstorey cover, soil pH, fire and transect orientation. Cover of buffel grass did not exceed ~20% but it still accounted for a small amount of the variation in the composition of ground vegetation and birds, and of the ‘ground-dwelling’ bird guild and the ‘hot climate specialist’ functional group of ants. There were insufficient reptiles for analysis. We conclude that, even when cover is low, buffel grass can have a detectable influence on some aspects of community dynamics. Given the evidence from published literature and from this study, we expect the influence of buffel grass on the diversity of native flora and fauna to increase, particularly if buffel grass expands into land types previously thought unsuited to its environmental needs.
14
Arab, Daej A., Anna Namyatova, Theodore A. Evans, Stephen L. Cameron, David K. Yeates, Simon Y. W. Ho, and Nathan Lo. "Parallel evolution of mound-building and grass-feeding in Australian nasute termites." Biology Letters 13, no. 2 (February 2017): 20160665. http://dx.doi.org/10.1098/rsbl.2016.0665.
Повний текст джерелаАнотація:
Termite mounds built by representatives of the family Termitidae are among the most spectacular constructions in the animal kingdom, reaching 6–8 m in height and housing millions of individuals. Although functional aspects of these structures are well studied, their evolutionary origins remain poorly understood. Australian representatives of the termitid subfamily Nasutitermitinae display a wide variety of nesting habits, making them an ideal group for investigating the evolution of mound building. Because they feed on a variety of substrates, they also provide an opportunity to illuminate the evolution of termite diets. Here, we investigate the evolution of termitid mound building and diet, through a comprehensive molecular phylogenetic analysis of Australian Nasutitermitinae. Molecular dating analysis indicates that the subfamily has colonized Australia on three occasions over the past approximately 20 Myr. Ancestral-state reconstruction showed that mound building arose on multiple occasions and from diverse ancestral nesting habits, including arboreal and wood or soil nesting. Grass feeding appears to have evolved from wood feeding via ancestors that fed on both wood and leaf litter. Our results underscore the adaptability of termites to ancient environmental change, and provide novel examples of parallel evolution of extended phenotypes.
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Kagirova, M. V., and Yu N. Romantseva. "ANALYSIS OF FOREIGN EXPERIENCE OF DIGITALIZATION IN AGRICULTURE ON THE EXAMPLE OF AUSTRALIA AND ASIAN COUNTRIES." EKONOMIKA I UPRAVLENIE: PROBLEMY, RESHENIYA 4, no. 12 (2021): 88–97. http://dx.doi.org/10.36871/ek.up.p.r.2021.12.04.012.
Повний текст джерелаАнотація:
The paper contains the results of studying the conditions, processes and tools for the digitali-zation of agriculture in Japan, South Korea and Australia, which have common soil and climatic conditions and specialization in production with some regions of Russia, the identity of the problems in the implementa-tion of digital transformations. As a result, the most relevant solutions for Russia were identified in the state strategy for the digitalization of the industry in the aspects of collaboration between science, education and production, areas of state support.
16
Cattle, Stephen R., and Damien J. Field. "A review of the soil science research legacy of the triumvirate of cotton CRC." Crop and Pasture Science 64, no. 12 (2013): 1076. http://dx.doi.org/10.1071/cp13223.
Повний текст джерелаАнотація:
For nearly two decades (1994–2012) a series of three consecutive Cooperative Research Centres (CRC) dealing with cotton production provided the impetus and financial support for a substantial body of soil science research in eastern and northern Australia. Focusing on the most commonly utilised soil for irrigated crop production, the Vertosol, CRC-affiliated soil researchers undertook detailed soil inventories of cotton-growing valleys in New South Wales, and tackled a range of applied soil research questions that faced the entire Australian cotton industry. Across the broad categories of soil mapping and characterisation, soil physical condition, salinity and sodicity, soil chemical fertility, and soil carbon and biota, some 120 CRC-affiliated research papers were published in peer-reviewed journals during the years of the CRC. Findings from this body of research were fed back to the industry through conferences, extension workshops and materials, and to a lesser extent, the peer-reviewed publications. In certain cases, underpinning basic research was carried out concurrently with the more applied research, meaning that the cotton CRC were effectively supporting advances in the discipline of soil science, as well as in sustainable cotton production. A feature of the soil research portfolio over the span of the three cotton CRC was that priorities shifted according to the interplay of three factors; the natural maturation of research topics and the concomitant evolution of cotton farming systems, the rising importance of environmental implications of agricultural land use, and the emergence of carbon as a national research priority. Furthermore, the commitment of the CRC to education resulted in the involvement of undergraduate and postgraduate university students in all aspects of the soil research effort. A legacy of the triumvirate of cotton CRC is a wide-ranging body of both applied and basic knowledge regarding the physical, chemical and biological attributes of Australian Vertosols used for irrigated agriculture.
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Wood, H., and R. Degabriele. "Genetic Variation and Phenotypic Plasticity in Populations of Paterson's Curse (Echium plantagineum L.) In South-Eastern Australia." Australian Journal of Botany 33, no. 6 (1985): 677. http://dx.doi.org/10.1071/bt9850677.
Повний текст джерелаАнотація:
Natural populations of Echium plantagineum on an east-west line across south-eastern Australia were sampled on three occasions during the growing season, and seeds collected from individual plants in each population were grown in a common glasshouse. In another experiment seedlings of E. plantagineum were divided and clones from each plant were grown under two soil moisture regimes. Field populations differed significantly in all seven characters measured at all sampling dates but, with one exception, between-population differences were unrelated to five climatic indices. Glasshouse populations differed significantly in 15 of 27 characters; variations in some of these characters were related by regression analysis to one or more of the climatic indices. Clones grown under moisture stress flowered later, had proportionally wider leaves and were smaller than well watered clones. The data suggest that an ecocline has developed, or is developing, in E. plantagineum in south- eastern Australia in response to large-scale and long-term aspects of climate, although extensive genetic variation between individuals in each population was also observed. This species exhibits a great deal of phenotypic plasticity in response to localized environmental factors.
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Cowie, Annette, Richard Eckard, and Sandra Eady. "Greenhouse gas accounting for inventory, emissions trading and life cycle assessment in the land-based sector: a review." Crop and Pasture Science 63, no. 3 (2012): 284. http://dx.doi.org/10.1071/cp11188.
Повний текст джерелаАнотація:
Governments, organisations and individuals have recognised the need to reduce their greenhouse gas (GHG) emissions. To identify where savings can be made, and to monitor progress in reducing emissions, we need methodologies to quantify GHG emissions and sequestration. Through the Australian Government’s Carbon Farming Initiative (CFI) landholders may generate credits for reducing emissions and/or sequestering carbon (C). National GHG inventories for the United Nations Framework Convention on Climate Change, and accounting under the Kyoto Protocol use a sectoral approach. For example, fuel use in agriculture is reported in the transport component of the energy sector; energy use in producing herbicide and fertiliser is included in the manufacturing section of the energy sector; sequestration in farm forestry is reported in the land use, land-use change and forestry sector, while emissions reported in the agriculture sector include methane (CH4) from ruminant livestock, nitrous oxide (N2O) from soils, and non-carbon dioxide (CO2) GHG from stubble and savannah burning. In contrast, project-level accounting for CFI includes land-use change, forestry and agricultural sector emissions, and significant direct inputs such as diesel and electricity. A C footprint calculation uses a life cycle approach, including all the emissions associated with an organisation, activity or product. The C footprint of a food product includes the upstream emissions from manufacturing fertiliser and other inputs, fuel use in farming operations, transport, processing and packaging, distribution to consumers, electricity use in refrigeration and food preparation, and waste disposal. Methods used to estimate emissions range from simple empirical emissions factors, to complex process-based models. Methods developed for inventory and emissions trading must balance the need for sufficient accuracy to give confidence to the market, with practical aspects such as ease and expense of data collection. Requirements for frequent on-ground monitoring and third party verification of soil C or livestock CH4 estimates, for example, may incur costs that would negate the financial benefit of credits earned, and could also generate additional GHG emissions. Research is required to develop practical on-farm measures of CH4 and N2O, and methods to quantify C in environmental plantings, agricultural soils and rangeland ecosystems, to improve models for estimation and prediction of GHG emissions, and enable baseline assessment. There is a need for whole-farm level estimation tools that accommodate regional and management differences in emissions and sequestration to support landholders in managing net emissions from their farming enterprises. These on-farm ‘bottom-up’ accounting tools must align with the ‘top-down’ national account. To facilitate assessment of C footprints for food and fibre products, Australia also needs a comprehensive life cycle inventory database. This paper reviews current methods and approaches used for quantifying GHG emissions for the land-based sectors in the context of emissions reporting, emissions trading and C footprinting, and proposes possible improvements. We emphasise that cost-effective yet credible GHG estimation methods are needed to encourage participation in voluntary offset schemes such as the CFI, and thereby achieve maximum mitigation in the land-based sector.
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Badgery, W. B., and D. L. Michalk. "Synthesis of system outcomes for a grazing-management experiment in temperate native pastures." Animal Production Science 57, no. 9 (2017): 1869. http://dx.doi.org/10.1071/an16599.
Повний текст джерелаАнотація:
Increasing the intensity of grazing management from continuous grazing or set-stocking to intensive rotational grazing has been proposed as a way of improving the profitability and environmental outcomes for native pasture-based grazing systems in the high-rainfall zone (HRZ) of southern Australia. The present paper synthesised the results and outcomes of eight papers covering different aspects of a grazing-system study investigating the intensity of grazing management at Panuara (33°27ʹS, 148°56ʹE), 25 km south-west of Orange, New South Wales. The systems analysis covered soils and soil water, pastures, animal production, profitability and business risk by using a combination of field experiments and biophysical modelling. The experimental approach, engagement with stakeholders and the potential impact of the research outcomes are discussed; as are the future directions for grazing system research. Increasing the intensity of grazing management from a 1- to a 20-paddock system resulted in a 21% higher pasture growth, 22% higher stocking rate and 20% higher lamb production per hectare. However, modelling demonstrated that seasonal variability had a greater impact on profitability than did the management system, and whole-farm profitability of the 20-paddock system was lower than that of the 1- and 4-paddock systems due to higher infrastructure costs. Pasture stability was associated with a high perennial grass content (>70%), and a stocking rate of 4.2 ewes/ha for continuous grazing or 5.3 ewes/ha for intensive rotational grazing limited the potential for degradation events. Advantages were identified in fencing and managing production zones, with different production potential within a farm, to improve utilisation across the landscape and efficiency of fertiliser use. The farming-system approach successfully integrated field research with pre- and post-experimental modelling, and with strategic input from an advisory group containing farmers, researchers and advisors, to develop a full understanding of the impact, at a system level, of increasing the intensity of grazing management in the HRZ.
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Silveira, Fernando A. O., Peggy L. Fiedler, and Stephen D. Hopper. "OCBIL theory: a new science for old ecosystems." Biological Journal of the Linnean Society 133, no. 2 (April 23, 2021): 251–65. http://dx.doi.org/10.1093/biolinnean/blab038.
Повний текст джерелаАнотація:
Abstract This paper is an introduction to the special issue of the Biological Journal of the Linnean Society entitled OCBIL theory: a new science for old ecosystems. Firstly, we elaborate on the origins and development of OCBIL theory, which argues that landscape age, climatic buffering and soil fertility are key environmental dimensions shaping ecological and evolutionary processes across different scales. We then consider the 21 contributions made in this special issue in terms of cutting edge advances in the Southern Hemisphere that test, explore and apply aspects of OCBIL theory at the end of its first decade of formal publication. More attempts at refutation are urged, as untested aspects remain controversial. Lastly, a concluding discussion is offered on promising new lines of enquiry to develop the theory further and ensure its global application to pressing conservation issues facing biological and cultural diversity. Although OCBILs are absent or rare in much of the postglacial and periglacial Northern Hemisphere, we demonstrate, in south-west Europe and North America, starting with California, that they are likely to be found, thus extending the implications and applications of OCBIL theory in new directions. We also propose that, in many ways, Noongar Aboriginal cosmology from south-west Australia has developed sophisticated insights about ancient uplands that are precursors to key ideas in OCBIL theory.
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Morantes-Toloza, Javier Leonardo, and Luis Miguel Renjifo. "Cercas vivas en sistemas de producción tropicales: una revisión mundial de los usos y percepciones." Revista de Biología Tropical 66, no. 2 (May 24, 2018): 739. http://dx.doi.org/10.15517/rbt.v66i2.33405.
Повний текст джерелаАнотація:
Live fences in tropical production systems: a global review of uses and perceptions. The expansion of agricultural and livestock production has been a key factor in deforestation in the world and especially in the tropical region. Currently, more than half of the Earth’s surface is used for the establishment of production systems; in this context, live fences can generate positive effects on the environment and provide environmental goods and services. In this work, we reviewed the effects of live fences on production systems from the tropical regions of America, Africa, Asia and Australia, analyzing the uses and perceptions of farmers that have made use of these fences. It was found that live fences were mainly related to the delimitation of farms and pastures. However, their uses and benefits are manifold, among which we found: provide forage, wood extraction, fruit supply, windbreaks, medicinal, to avoid soil erosion, moisture retention and nutritional support. In addition, other positive perceptions were: increasing landscape connectivity, increasing economic incomes, reducing production costs, reducing pressure on remaining vegetation, keeping maintenance costs down, contributing to pest control, and improving fertility. However, negative perceptions included the excessive work in repairing or pruning them, shade negative impact on agricultural production, lack of information discourages establishment, high establishment costs, generation of property conflicts and management difficulty. It was found that the uses by farmers are focused on improving the yields of productive systems, but also on the conservation of natural resources especially soil and biodiversity. We proposed research topics for the future, as determining the criteria in the selection of native species to establish and enrich living fences valuing ecological and socioeconomic aspects; in additionally, we must deepen the benefits they produce on the yields of productive systems. We suggest the development of live fences studies in the tropical region of Australasia, because no data was found for this region, in order to know the biodiversity and services status that they provide to the rural communities. As a conclusion, it will be important to generate initiatives that encourage the formulation of rural policies, the creation of programs that encourage the establishment of live fences, whether through payments for environmental services, tax compensation or other mechanisms. Providing adequate information to farmers and livestock farmers is a key aspect on dynamizing the establishment of live fences. Rev. Biol. Trop. 66(2): 739-753. Epub 2018 June 01.
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Lloyd, D. L., B. Johnson, S. M. O'Brien, and D. N. Lawrence. "Action learning in partnership with Landcare and catchment management groups to support increased pasture sowings in southern inland Queensland." Animal Production Science 49, no. 10 (2009): 907. http://dx.doi.org/10.1071/ea08298.
Повний текст джерелаАнотація:
The incorporation of sown pastures as short-term rotations into the cropping systems of northern Australia has been slow. The inherent chemical fertility and physical stability of the predominant vertisol soils across the region enabled farmers to grow crops for decades without nitrogen fertiliser, and precluded the evolution of a crop–pasture rotation culture. However, as less fertile and less physically stable soils were cropped for extended periods, farmers began to use contemporary farming and sown pasture technologies to rebuild and maintain their soils. This has typically involved sowing long-term grass and grass–legume pastures on the more marginal cropping soils of the region. In partnership with the catchment management authority, the Queensland Murray–Darling Committee (QMDC) and Landcare, a pasture extension process using the LeyGrain™ package was implemented in 2006 within two Grain & Graze projects in the Maranoa-Balonne and Border Rivers catchments in southern inland Queensland. The specific objectives were to increase the area sown to high quality pasture and to gain production and environmental benefits (particularly groundcover) through improving the skills of producers in pasture species selection, their understanding and management of risk during pasture establishment, and in managing pastures and the feed base better. The catalyst for increasing pasture sowings was a QMDC subsidy scheme for increasing groundcover on old cropping land. In recognising a need to enhance pasture knowledge and skills to implement this scheme, the QMDC and Landcare producer groups sought the involvement of, and set specific targets for, the LeyGrain workshop process. This is a highly interactive action learning process that built on the existing knowledge and skills of the producers. Thirty-four workshops were held with more than 200 producers in 26 existing groups and with private agronomists. An evaluation process assessed the impact of the workshops on the learning and skill development by participants, their commitment to practice change, and their future intent to sow pastures. The results across both project catchments were highly correlated. There was strong agreement by producers (>90%) that the workshops had improved knowledge and skills regarding the adaptation of pasture species to soils and climates, enabling a better selection at the paddock level. Additional strong impacts were in changing the attitudes of producers to all aspects of pasture establishment, and the relative species composition of mixtures. Producers made a strong commitment to practice change, particularly in managing pasture as a specialist crop at establishment to minimise risk, and in the better selection and management of improved pasture species (particularly legumes and the use of fertiliser). Producers have made a commitment to increase pasture sowings by 80% in the next 5 years, with fourteen producers in one group alone having committed to sow an additional 4893 ha of pasture in 2007–08 under the QMDC subsidy scheme. The success of the project was attributed to the partnership between QMDC and Landcare groups who set individual workshop targets with LeyGrain presenters, the interactive engagement processes within the workshops themselves, and the follow-up provided by the LeyGrain team for on-farm activities.
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Anderson De Vechi and Carlos Alberto De Oliveira Magalhães Júnior. "Avaliação dos aspectos ambientais do cultivo do eucalipto, relato de caso em Goioerê- Paraná: Uma Perspectiva para a educação ambiental." UNICIÊNCIAS 25, no. 1 (June 14, 2021): 57–64. http://dx.doi.org/10.17921/1415-5141.2021v25n1p57-64.
Повний текст джерелаАнотація:
O eucalipto, planta exótica originária da Austrália, chegou ao Brasil e se adaptou ao clima e ao solo, circunstâncias que auxiliaram seu pleno desenvolvimento. Como consequência, o eucalipto se alastrou em vários estados brasileiros, sua madeira passou a ser industrializada, o que lhe agregou valor econômico. O presente artigo aborda indagações relativas sobre o eucalipto e a educação ambiental critica quanto a cultura dessa espécie, explorando os aspectos da sua utilização e os questionamentos ambientais em relação aos recursos naturais do ecossistema.Na abordagem metodológica investigou-se, por meio de visitas in loco, cinco propriedades de Goioerê, PR, especialmente em um bairro cujo nome fictício é “São Miguel”, visando conhecer como o manejo do eucalipto ocorre nessa região paranaense. Elaborou-se um almanaque digital com o software Scratch e um jogo digital por meio do software motor gráfico Unity, nos quais constam aspectos do eucalipto e da educação ambiental.O jogo digital expõe, práticas direcionadas para a educação ambiental e temas acerca dessa espécime exótica, denotando a percepção e importância das árvores nativas bem como o processo de preservação e conservação, fortalecendo a concepção a respeito do município de Goioerê e o seu ecossistema. Após os resultados advindos com a produção do jogo e almanaque, e estes foram disponibilizados aos professores de Ciências e Biologia para serem utilizados em suas práticas pedagógicas, e para os produtores rurais como informativo. Esperou-se que os saberes ali dispostos transmitam uma percepção crítica relativa à produção do eucalipto, integrando os conceitos relacionados a essa espécie de planta no âmbito das Ciências Ambientais.
Palavras-chave: Eucalyptus. Saber ambiental. Impactos Ambientais.
Abstract
Eucalyptus, an exotic plant originally from Australia, arrived in Brazil and adapted to the climate and soil, circumstances that helped its full development. As a consequence, eucalyptus spread in several Brazilian states, its wood started to be industrialized, which added economic value. This article addresses questions concerning eucalyptus and critical environmental education regarding the culture of this species, exploring aspects of its use and environmental questions in relation to the natural resources of the ecosystem. loco, five properties in Goioerê, PR, especially in a neighborhood whose fictitious name is “São Miguel”, aiming to understand how the management of eucalyptus occurs in this region of Paraná. A digital almanac was created with the Scratch software and a digital game using the Unity graphics engine software, which contains aspects of eucalyptus and environmental education, denoting the perception and importance of native trees as well as the preservation and conservation process, strengthening the conception regarding the municipality of Goioerê and its ecosystem. After the results resulting from the production of the game and almanac, these were made available to Science and Biology teachers to be used in their pedagogical practices, and to rural producers as information. It was hoped that the knowledge available there will convey a critical perception regarding the production of eucalyptus, integrating the concepts related to this species of plant within the scope of Environmental Sciences.
Keywords: Eucalyptus. Environmental knowledge. Environmental Impacts.
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Connor, David J. "Adaptation of olive (Olea europaea L.) to water-limited environments." Australian Journal of Agricultural Research 56, no. 11 (2005): 1181. http://dx.doi.org/10.1071/ar05169.
Повний текст джерелаАнотація:
Olive has been widely grown around the Mediterranean Basin for around 5000 years, where productivity and survival of this long-lived evergreen tree in environments of low and variable rainfall depend on physiological characteristics but also on management. The tree exercises effective control of water loss by transpiration and can also withstand intense internal water deficit that in turn increases extraction of water from soil. Critical aspects of management that maintain, albeit limited, transpiration and metabolic activity during hot dry summer months, are directed at both crop and understorey. Strategic decisions are selection of cultivar, tree density, and canopy size, together with surface management as tilled soil or as cover crop of selected species. Tactical adjustments are seen in extra pruning of olives and timing of tillage, or of grazing, mowing, or herbicides to restrict growth and water use of the understorey, especially following dry winters and during dry summers. Survival of olive orchards in low-rainfall climates requires that canopies intercept a small proportion of incident radiation, depending upon rainfall amount, distribution, and soil water storage capacity. Crop water balance models can assist in defining optimum canopy size for productivity and survival. New olive production in the Mediterranean and now extending widely in the ‘New World’, including in Australia, deviates widely from traditional practice. Orchards are planted at higher density, are generally irrigated, and trees are formed to suit mechanical pruning and harvesting. The environmental adaptation and understanding of water relations of olive in traditional systems are of limited applicability to these new production systems. Rather, there are now new emphases on nutrition, irrigation, canopy management, assimilate relationships, and fruiting performance to add to the existing questions of the suitability of cultivars to new environments in terms of productivity and oil quality.
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Cui, Lilu, Chengkang Zhu, Zhengbo Zou, Chaolong Yao, Cheng Zhang, and Yu Li. "The Spatiotemporal Characteristics of Wildfires across Australia and Their Connections to Extreme Climate Based on a Combined Hydrological Drought Index." Fire 6, no. 2 (January 22, 2023): 42. http://dx.doi.org/10.3390/fire6020042.
Повний текст джерелаАнотація:
With the frequent occurrence of extreme climates around the world, the frequency of regional wildfires is also on the rise, which poses a serious threat to the safety of human life, property, and regional ecosystems. To investigate the role of extreme climates in the occurrence and spread of wildfires, we combined precipitation, evapotranspiration, soil moisture (SM), maximum temperature (MT), relative humidity, plant canopy water, vapor pressure deficit, and a combined hydrological drought index based on six Gravity Recovery and Climate Experiment (GRACE) and its follow-on (GRACE-FO) products to study the relationship between climate change and wildfires across Australia between 2003 and 2020. The results show that Australia’s wildfires are mainly concentrated in the northern region, with a small number being distributed along the southeastern coast. The high burned months are September (2.5941 × 106 ha), October (4.9939 × 106 ha), and November (3.8781 × 106 ha), while the years with a larger burned area are 2011 (79.95 × 106 ha) and 2012 (78.33 × 106 ha) during the study period. On a seasonal scale, the terrestrial water storage change and the hydrometeorological factors have the strong correlations with burned area, while for only the drought index, SM and MT are strongly related to burned area on an interannual scale. By comparing the data between the high burned and normal years, the impact of droughts on wildfires is achieved through two aspects: (1) the creation of a dry atmospheric environment, and (2) the accumulation of natural combustibles. Extreme climates affect wildfires through the occurrence of droughts. Among them, the El Niño–Southern Oscillation has the greatest impact on drought in Australia, followed by the Pacific Decadal Oscillation and the Indian Ocean Dipole (correlation coefficients are −0.33, −0.31, and −0.23, respectively), but there is little difference among the three. The proposed hydrological drought index in our study has the potential to provide an early warning of regional wildfires. Our results have a certain reference significance for comprehensively understanding the impact mechanism of extreme climates on regional wildfires and for establishing an early warning system for regional wildfires.
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Cochrane, HR, G. Scholz, and AME Vanvreswyk. "Sodic soils in Western Australia." Soil Research 32, no. 3 (1994): 359. http://dx.doi.org/10.1071/sr9940359.
Повний текст джерелаАнотація:
Sodic soils are common throughout Western Australia, particularly in the south-west agricultural area where they occur mainly as duplex or gradational profiles. Soils with sodic properties are dominant in 26% of the state; saline-sodic sediments and soils in intermittent streams, lakes and estuarine plains occupy a further 5%. Sodic soils are moderately common throughout the south and western portion of the rangeland areas (38% of the state). The south-west coastal sands and the desert and rangeland soils to the north and east of the state are rarely sodic. Although sodicity has been recognized as a discrete problem in W.A. soils since the 1920s, the extent and severity of sodicity has been satisfactorily described only for small areas of the state and most land managers are unaware of the role sodicity plays in limiting the productivity of their soils. Sodicity is implicated in a diversity of problems for both agricultural and non-agricultural uses of Western Australian soils. Subsoil impermeability is probably the most widespread of these, but no comprehensive, quantitative assessment of the influence of exchangeable sodium on subsoil properties has been undertaken. Topsoil sodicity is much less extensive but can severely restrict land productivity, particularly on sandy loam and finer textured soils which set hard when dry. The physical behaviour of Western Australian topsoils cannot usefully be predicted from measurements of exchangeable sodium alone because soils differ so greatly in their response to changing exchangeable sodium. Some remain structurally stable at ESP values >15 while others are so 'sodium-sensitive' that they exhibit highly dispersive behaviour at ESP values as low as 2%. Land values over much of the dryland farming and pastoral areas of W.A. do not justify sustained use of amendments which would reduce soil exchangeable sodium contents. Efficient management of sodic soils in these areas must rely on the prevention of degradation and the use of biological and physical means to maintain adequate soil physical properties. Effective restoration of degraded sodic soils, however, often does require application of inorganic amendments in combination with tillage to initiate structural recovery. Sodicity is currently not considered to be a problem at any of the three main irrigation areas in W.A., but all have sodic soil within their potentially irrigable lands, which may limit their future expansion.
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Williams, Jacqueline. "Soils Governance in Australia: challenges of cooperative federalism." International Journal of Rural Law and Policy, no. 1 (March 26, 2015): 1–12. http://dx.doi.org/10.5130/ijrlp.i1.2015.4173.
Повний текст джерелаАнотація:
This paper analyses soil governance in Australia and the challenges facing sustainable natural resource management within the context of a cooperative system of federation and a globalised market economy. With only 6 per cent of the Australian landmass considered arable, one would assume that protecting Australia’s valuable soil resource would be of national significance. However, Australia currently lacks nationally consistent policies and legal instruments to ensure that its soil is protected, maintained and enhanced for future generations. While recognising that soil governance is a broad discipline encompassing many areas of soil science and management, this discussion will only focus on the soil conservation aspects of sustainable ecosystems and sustainable food and fibre in Australia; it will not explore in depth issues of soil contamination and other pollution related areas. The paper discusses: the state of Australian soils and the managers of these resources; current soil governance in Australia (based on the Food and Agriculture Organisation of the United Nations definition); and a case study example of an Australian state approach to landuse conflict and the protection of agricultural lands. The paper highlights policies and institutional arrangements required for the protection of Australian soil and the very communities that are attempting to steward these resources for future generations.
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Clapp, C. Edward, Michael H. B. Hayes, and Claudio Ciavatta. "Organic wastes in soils: Biogeochemical and environmental aspects." Soil Biology and Biochemistry 39, no. 6 (June 2007): 1239–43. http://dx.doi.org/10.1016/j.soilbio.2006.12.001.
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Naidu, R., RH Merry, GJ Churchman, MJ Wright, RS Murray, RW Fitzpatrick, and BA Zarcinas. "Sodicity in South Australia - a review." Soil Research 31, no. 6 (1993): 911. http://dx.doi.org/10.1071/sr9930911.
Повний текст джерелаАнотація:
The current knowledge of the nature and distribution of sodic soils in South Australia is reviewed. The agriculturally developed area of South Australia lies south of latitude 32-degrees-S. and is mainly used for low intensity grazing and dry land cereal/sheep production. A high proportion of the State, including much of the high rainfall area, has soils which are sodic (>6% ESP) through a significant proportion of the profile but information on the precise nature of sodicity in these soils is limited. Where exchangeable cation data axe available, the analytical techniques used often did not precisely delineate between soluble salts in the soil and ions on exchange sites. Therefore, many of the datasets have major weaknesses and may be unreliable. Since many soils with ESP <6 also show dispersive characteristics typical of sodic soils, there is an urgent need for new sodicity studies relating to distribution and the criteria (ESP) used to identify dispersive soils. Information on the effect of sodicity on nutrient requirements of plants, especially the modern varieties, is scarce both locally and internationally, making development of management strategies for economically sustainable crop production difficult. Further, many different grades of gypsum are available in South Australia. Preliminary studies show the presence of impurities drastically influences gypsum dissolution characteristics. More effort is needed to assess the quality and reactivity of South Australian gypsum. Some effort has been directed by land managers towards reclamation and management of sodic soils by using both gypsum and lime either separately or as mixtures. However, there is neither a scientific basis for the application of gypsum-lime mixtures nor crop production data to support such management strategies.
30
Tiller, KG. "Urban soil contamination in Australia." Soil Research 30, no. 6 (1992): 937. http://dx.doi.org/10.1071/sr9920937.
Повний текст джерелаАнотація:
The current knowledge of the pollution of Australian urban soils was reviewed with special reference to heavy metals. Increased community concern in recent years has resulted m a major upsurge in the investigation and rehabilitation of contaminated soils. This has led to a concomitant reassessment and development of regulatory procedures, and the establishment of some new environmental agencies. This review considers sources and extent of contamination, and approaches to the establishment of reference background levels in urban and rural areas. Assessment of contaminated sites has been largely based on overseas experience but site specific approaches relevant to Australian soils and climates are needed and are being developed by State authorities in collaboration with the Australian and New Zealand Environmental and Conservation Council and the National Health and Medical Research Council. The need for soil-based research and for standardized soil sampling procedures for site evaluation and action is stressed. Many opportunities exist for soil scientists in solving problems of soil contamination and rehabilitation.
31
Britt, Allison F., Raymond E. Smith, and David J. Gray. "Element mobilities and the Australian regolith - a mineral exploration perspective." Marine and Freshwater Research 52, no. 1 (2001): 25. http://dx.doi.org/10.1071/mf00054.
Повний текст джерелаАнотація:
Much of the Australian regolith ranges from Palaeogene to Late Cretaceous in age or even older, contrasting with the relatively young landscapes of the Northern Hemisphere. Hence, many imported geochemical exploration methods are unsuitable for Australian environments; this has led to successful homegrown innovation. Exploration geochemistry seeks to track geochemical anomalies arising from concealed ore deposits to their source. Much is known about element associations for different types of ore deposits and about observed patterns of dispersion. Element mobility in a range of Western Australian environments is discussed, drawing on field examples from the Mt Percy and Boddington gold mines and the Yandal greenstone belt, with reference to the effect of modern and past weathering regimes and the influence of groundwater on element mobility. Soil biota and vegetation affect Au mobility in the regolith, but specific processes, scale and environmental factors are unknown. Possible future synergies between biogeochemical or environmental research and regolith exploration geochemistry include determining the fundamental biogeochemical processes involved in the formation of geochemical anomalies as well as environmental concerns such as regolith aspects of land degradation. Exploration geochemists must study the work of biogeochemical and environmental researchers, and vice versa. There should also be collaborative research with regolith scientists and industry.
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Yeates, J. S. "Soils and fertilizer use in southwestern Australia." Fertilizer Research 36, no. 2 (1993): 123–25. http://dx.doi.org/10.1007/bf00747582.
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Griffith, S. J., C. Bale, and P. Adam. "Environmental correlates of coastal heathland and allied vegetation." Australian Journal of Botany 56, no. 6 (2008): 512. http://dx.doi.org/10.1071/bt06147.
Повний текст джерелаАнотація:
The east Australian coastline supports regionally distinct heathlands and allied structural formations, and of particular interest is the vegetation on Quaternary dunefields and beach ridge plains containing aquifers. Groundwater is abstracted from these aquifers for domestic, industrial and agricultural consumption, and this abstraction proceeds without a sound understanding of plant–water relations. This study examined relationships between the vegetation and a range of simple and complex environmental variables. Aspects of intra-habitat and micro-site environmental heterogeneity were also explored. Watertable depth varied spatially and temporally relative to vegetation type, although differences were not consistently significant. Differences in watertable depth were significant for vegetation samples grouped by topographic position. Plant roots were invariably present at the upper boundary of the aquifer and these were observed at depths of up to 10.5 m. Groundwater was found to have the chemical composition of dilute seawater. Soil properties for the A1 horizon (total phosphorus, total nitrogen and organic matter content) varied with vegetation type and topography, and although mean values were generally higher in wetter habitats, differences were not consistently significant. Ordination identified topography as the more important determinant of vegetation pattern. Intra-habitat and micro-site differences in soil and groundwater properties were detected, and the likely causes of this variation are discussed.
34
Xiong, X., F. Stagnitti, G. Allinson, N. Turoczy, P. Li, M. LeBlanc, M. A. Cann, et al. "Effects of clay amendment on adsorption and desorption of copper in water repellent soils." Soil Research 43, no. 3 (2005): 397. http://dx.doi.org/10.1071/sr04088.
Повний текст джерелаАнотація:
Copper is an important micronutrient and trace amounts are essential for crop growth. However, high concentrations of copper will produce toxic effects. Australia is increasingly developing production of crops in water repellent soils. Clay amendment, a common amelioration techniques used in Australia, has demonstrated agronomic benefits in increased crop or pasture production. The sorption and desorption of copper and the effect of clay treatment on copper behaviour in a water repellent soil collected from an experimental farm in South Australia is studied. We found that the water repellent soils amended with clay have an increased adsorption capacity of copper. Also the clay-amended soils had an increased ratio of specific sorption to total sorption of copper. The implications of this study to the sustainable agro-environmental management of water repellent soils is discussed.
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Isbell, RF. "A brief history of national soil classification in Australia since the 1920s." Soil Research 30, no. 6 (1992): 825. http://dx.doi.org/10.1071/sr9920825.
Повний текст джерелаАнотація:
Modern soil science concepts and ideas relating to classification were introduced into Australia in the late 1920's by J. A. Prescott who, in 1931 and 1944, also produced the first maps of Australia showing the broad soil zones. This was followed up in the fifties by C. G. Stephens who formalised the Great Soil Group concept in his Manual of Australian Soils (1953) and in 1961 produced a map and publication titled The Soil Landscapes of Australia. Around this time however, other ideas were being put forward, notably by E. G. Hallsworth and colleagues, and especially by G. W. Leeper, whose original ideas on classification were to provide the foundation for the Factual Key of K. H. Northcote (1960a), which was used as the basis of the Atlas of Australian Soils project (1960-68). The Great Soil Group concept of Stephens was amplified in 1968 in A Handbook of Australian Soils (Stace et al. 1968) which was produced for the Adelaide International Society of Soil Science Congress. This review also considers the role of numerical methods and of Soil Taxonomy in Australia and concludes that while neither are likely to provide the most suitable scheme for Australia, the use of the latter to identify our soils must be encouraged so that the rest of the world is able to relate to our published soil research. Currently, the Factual Key and Handbook classifications are both used in Australia. Both are obsolescent as they date from the early sixties and the vast amount of soils knowledge accumulated since then, particularly in tropical Australia, has not been incorporated into either system. Their deficiencies have led over the past seven years to the development of a new Australian Classification System (a five-level hierarchial general purpose scheme with mutually exclusive classes identified by keys). This scheme is now being tested throughout Australia.
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Chartres, CJ. "Sodic soils - an introduction to their formation and distribution in Australia." Soil Research 31, no. 6 (1993): 751. http://dx.doi.org/10.1071/sr9930751.
Повний текст джерелаАнотація:
This paper briefly summarizes existing Australian data about causes of sodicity and the distribution of sodic soils in Australia. Sources of salts and sodium include atmospheric accession, salts released by weathering processes and saline groundwaters. A traditional model of sodic soil pedogenesis is contrasted with more recent data demonstrating the role of several factors including mineralogy, EC/ESP relationships and exchangeable magnesium percentage on development and behaviour of sodic soils. Limited data about the national distribution of sodic soils are presented. There has been very little recent innovative research in Australia to increase understanding of soils affected by sodicity. A number of research needs are indicated.
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Suh, Jeong-Yul. "Hydrogeochemical aspects in reclaimed area, Sydney, Australia." Geosciences Journal 8, no. 1 (March 2004): 61–71. http://dx.doi.org/10.1007/bf02910279.
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VALENTINE, K. W. G., C. TARNOCAI, C. R. DE KIMPE, R. H. KING, J. F. DORMAAR, W. J. VREEKEN, and S. A. HARRIS. "SOME ASPECTS OF QUATERNARY SOILS IN CANADA." Canadian Journal of Soil Science 67, no. 2 (May 1, 1987): 221–47. http://dx.doi.org/10.4141/cjss87-021.
Повний текст джерелаАнотація:
This review describes some aspects of Canadian soils that are relevant to the Quaternary. It includes a description of the Quaternary Period in Canada, including a chronology of the major events that influenced soil formation, and the implication of the Quaternary to Canadian soils. The contribution of relict and buried paleosols to Quaternary stratigraphy and the reconstruction of paleoenvironments is then discussed, including some of the inherent problems. Pedologic evidence of environmental change in the southern Rocky Mountains, including tephrostratigraphy, is followed by a description, with numerous radiocarbon dates, of Holocene peat deposits. The review concludes with a discussion of weathering and saprolites in eastern Canada. Key words: Quaternary, Holocene, paleosols, stratigraphy, paleoenvironments, peat
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Armour, JD, GSP Ritchie, and AD Robson. "Extractable zinc in particle size fractions of soils from Western-Australia and Queensland." Soil Research 28, no. 3 (1990): 387. http://dx.doi.org/10.1071/sr9900387.
Повний текст джерелаАнотація:
The zinc (Zn) content of particle size fractions of 12 mainly Zn deficient soils was measured by extraction with three contrasting extractants. The soils, which ranged from sands to a black earth, were from Western Australia and Queensland and particle size fractions (clay, silt, fine sand, coarse sand) were obtained by sieving and sedimentation after ultrasonification of soil suspended in deionized water. The extractants were concentrated HNO3/H2SO4/HClO4 (acid extractable or AE-Zn), DTPA and 0.002 M CaCl2. For each extractant, Zn contents of the fractions and whole soils were correlated with organic carbon and ammonium oxalate extractable Fe and Al. The AE-Zn concentrations in whole soils were 0.6-132 mg kg-1 and high clay soils had higher concentrations (mean 54 mg kg-1) than low clay soils (mean 2 mg kg-1). After fractionation, lowest AE- and DTPA-Zn were found in coarse sand fractions and concentrations increased with decreasing particle size. Clay plus silt fractions contained 60-99% of the whole soil AE-Zn and 76-93% of the whole soil DTPA-Zn. The CaCl2-Zn concentrations were very low (<5.0 �g kg-1) for all soils. In whole soils, DTPA-Zn was only a small proportion, 3.2% and 1.8%, of the AE-Zn in the low clay and high clay soils, respectively. The CaCl2-Zn was generally less than 2% of the DTPA-Zn in whole soils. In whole soils, AE-Zn was correlated with oxalate extractable Fe and with oxalate A1 (r = 0.72 and 0.71, respectively; P <0.01), whereas DTPA-Zn was correlated with oxalate extractable Fe (r = 0.82; P < 0.01). The AE- and DTPA-Zn were correlated with organic carbon only in some fractions. The DTPA- and CaCl2-Zn were not correlated with AE-Zn content, nor was DPTA-Zn correlated with CaCl2-Zn in whole soils or fractions (P<0.05). Dispersion of the soils with ultrasonification in the absence of dispersing agents was not as effective as dispersion with conventional mechanical/chemical dispersion. The percentage of the soil recovered in the clay fraction after sonification was 23-78% of that recovered by the conventional method. Fine and coarse sand contents were similar for either method, indicating that incomplete dispersion of clay by ultrasonification resulted in higher silt contents.
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Surapaneni, Aravind. "Preface: Sodicity issues in agricultural industries." Soil Research 39, no. 6 (2001): I. http://dx.doi.org/10.1071/srv39n6_pr.
Повний текст джерелаАнотація:
Australia is recognised as containing the world�s largest area of sodic soils, with approximately 33% of the continent being affected. The first National Conference and Workshop on Sodic Soils in Australia was held in Adelaide (9�13 November 1992), to bring together information and experience on sodic soils available at that time. The papers from that conference were published as a special issue of the Australian Journal of Soil Research (Volume 31, 1993). The 1992 conference covered a wide range of topics, including distribution, classification, mineralogy, fertility, environmental consequences, irrigation, and management of sodic soils. Importantly, it identified priority areas for research in each of these topics.
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Dörken, V. M., P. G. Ladd, and R. F. Parsons. "Anatomical aspects of xeromorphy in arid-adapted plants of Australia." Australian Journal of Botany 68, no. 3 (2020): 245. http://dx.doi.org/10.1071/bt19073.
Повний текст джерелаАнотація:
Plants from arid environments have some of the most diverse morphological and anatomical modifications of any terrestrial plants. Most perennials are classified as xerophytes, and have structures that limit water loss during dry weather, provide structural support to help prevent cell collapse during dry periods or store water in photosynthetic tissues. Some of these traits are also found in sclerophyllous plants and traits that may have developed due to evolution of taxa on nutrient poor soils may also benefit the plants under arid conditions. We examined the morpho-anatomical features of photosynthetic organs of three tree and four shrub species with reduced leaves or photosynthetic stems that occur in arid or semiarid sites in Australia to see if there were patterns of tissue formation particularly associated with xeromorphy. In addition, we reviewed information on succulent and resurrection species. In the tree species (Callitris spp.) with decurrent leaves clothing the stems, the close association between the water transport system and stomata, along with anisotropic physiology would allow the species to fix carbon under increasingly dry conditions in contrast to more broad-leaved species. The shrub species (Tetratheca species and Glischrocaryon flavescens) with photosynthetic stems had extensive sclerenchyma and very dense chlorenchyma. The lack of major anatomical differences between leafless species of Tetratheca from arid areas compared with more mesic sites indicates that quite extreme morphological modifications may not exclude species from growing successfully in competition with species from less arid areas. The sclerophyll flora now characteristic of Australian vegetation from seasonally arid climates may have evolved during mesic times in the past but with relatively minor modifications was able to adjust to the gradually drying climate of much of Australia up to the present time.
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Fitzpatrick, RW, SC Boucher, R. Naidu, and E. Fritsch. "Environmental consequences of soil sodicity." Soil Research 32, no. 5 (1994): 1069. http://dx.doi.org/10.1071/sr9941069.
Повний текст джерелаАнотація:
Australia has the highest ratio of salt-affected soils in relation to total surface area of any continent in the world, with approximately one third of the land mass being covered by sodic soils and 5% affected by soil salinity. Sodicity often coincides with the distribution of duplex soil profiles. In many areas these duplex soils are under agriculture. Sodicity substantially limits agricultural productivity. Although sodicity is considered to be an intrinsic property of the clay fraction of an affected profile, its full impact may be revealed through interactions with hydrological processes, resulting in various forms of both on-site and off-site environmental degradation. Some of the concepts, criteria and properties used to diagnose and classify sodic soils are discussed as a prelude to reviewing the nature and causes of the complex interactions which exist between related environmental problems such as dryland salinity, water erosion, waterlogging and water quality. There is a need for detailed studies to evaluate more thoroughly pertinent soil variables which link sodicity to both current and future environmental hazards, so that appropriate management strategies can be formulated.
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Buurman, P. "Humic Substances in Soils, Peats and Sludges-Health and Environmental Aspects." Soil Science 164, no. 6 (June 1999): 440–41. http://dx.doi.org/10.1097/00010694-199906000-00008.
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Riley, MM, AD Robson, JW Gartrell, and RC Jeffery. "The absence of leaching of molybdenum in acidic soils from Western Australia." Soil Research 25, no. 2 (1987): 179. http://dx.doi.org/10.1071/sr9870179.
Повний текст джерелаАнотація:
A glasshouse experiment was conducted to estimate the extent of leaching of molybdenum on acidic sandy soils from Western Australia. Sodium molybdate, at a rate equivalent to 40 g of molybdenum per hectare, was added to pots of soil either before or after leaching a column of the soil with the equivalent of 500 mm water. Molybdenum concentrations were determined in the leachate and in the wheat plants grown on the soils in pots after leaching. Approximately 10% of added molybdenum was removed with leaching from two grey sands, while negligible quantities were removed from three more acidic sandy soils. Leaching does not appear to be an important factor in the occurrence and recurrence of molybdenum deficiency on the yellow-brown acidic sandplain soils of the Western Australian wheatbelt.
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Bowmer, KH. "Atrazine persistence and toxicity in two irrigated soils of Australia." Soil Research 29, no. 2 (1991): 339. http://dx.doi.org/10.1071/sr9910339.
Повний текст джерелаАнотація:
The persistence of atrazine in two contrasting irrigated soils from the Riverine Plain of south-eastern Australia was measured in the laboratory at three constant temperatures. Particularly at lower temperatures atrazine was more persistent, by an order of magnitude, than reported for soils overseas; but in two successive field experiments, encompassing both surface and incorporated applications of atrazine in the heavier soil, residues measured after about 7 months were within the range expected from the literature. The measured residues were 2-6 times smaller than predicted using a simulation model, probably reflecting volatilization and other losses which are not included in the model, but which are expected to be substantial at the extremely high soil surface temperatures observed in the field. Comparative measurements of aged residues in the heavy clay soil showed higher results from chemical analysis of acetonitrile-water soil extracts than by in situ glasshouse bioassay using oats and turnips, demonstrating that only one third of the extractable residue was available to crops. Comparison of soil-based and hydroponic assay using soybeans showed that this soil reduced the effective atrazine concentration in solution by at least 16-fold, but sensitive crops could still be damaged when grown in rotation after tolerant crops, or if irrigated with contaminated water.
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Brandle, R., and K. E. Moseby. "Comparative ecology of two populations of Pseudomys australis in northern South Australia." Wildlife Research 26, no. 4 (1999): 541. http://dx.doi.org/10.1071/wr97049.
Повний текст джерелаАнотація:
Two disparate populations of Pseudomys australis, in the southern and north-western Lake Eyre Basin of South Australia, were studied over a 3-year period using trapping and radio-tracking techniques. Various aspects of the species’ ecology were investigated. Past records of the species were almost always associated with population irruptions following exceptionally wet years. Aspects of population dynamics, fine-scale habitat use, activity ranges and burrows were studied and related to habitat condition during three dry seasons following a good season. Both areas were associated with floodout plains in a gibber desert environment but differed in soils and vegetation structure. The population dynamics and structure and home-range activity also differed. These differences appeared to relate to the availability and distribution of food and shelter in the respective locations. The differences between populations in the two areas are discussed with reference to the source/sink and refugia concepts.
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Willett, IR, and KWJ Malafant. "Long term effects of rice growing on some chemical properties of two soils of northern Australia." Soil Research 24, no. 2 (1986): 239. http://dx.doi.org/10.1071/sr9860239.
Повний текст джерелаАнотація:
Solodic soils (Natrustalfs) of the Lower Burdekin Valley, Qld, and grey-brown clays (Chromusterts) of the Ord Irrigation Area, W.A., of varying rice cropping histories, were analysed before and after a laboratory flooding experiment to determine whether any long-term changes in chemical fertility had occurred. In the solodic group changes in the extractability of iron and manganese in acetate and oxalate reagents indicated that oxides of these elements may be more easily reduced in soils that had grown nine or more rice crops than in soils which had not been used for rice growing. The flooding experiment showed that manganese and iron reduction and the mobilization of phosphorus were more rapid in the solodic soils which had been used for rice than those which had not. Iron reduction did not occur in the flooded grey-brown clays, and manganese reduction was apparent only in three soils, but was most rapid in those which had grown 15 rice crops. Extractable phosphorus levels decreased during flooding of the grey-brown clays, but this was not related to the cropping history. There were small increases in sodicity of the subsoil (40-50 cm) of the solodic soils which had been used for rice growing. It was concluded that for the solodic soils rice growing leads to soils more favourable for further rice growing but less favourable for non-flooded crops, whereas this effect was not shown for the grey-brown clay soils.
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Boer, Ben. "Law for sustainable soils: International and national aspects." Glasnik Srpskog geografskog drustva 90, no. 4 (2010): 1–8. http://dx.doi.org/10.2298/gsgd1004001b.
Повний текст джерелаАнотація:
Work on the development of adequate international and national legal frameworks for sustainable soils has been underway for over a decade. Significantly, the initial drafting work on the need for an international convention or other instrument on soil came from the soil science community. In 1999, as a result of an approach from soil scientists to the IUCN Commission on Environmental Law a Specialist Group on Sustainable Soils and Desertification was established in order to investigate both international and national legal regimes to promote the sustainable use of soil. This paper looks at the development of an international legal instrument on sustainable soils, and explores the scope and range of possibilities for the form of such an instrument. It then canvasses the basic elements that should be included in the drafting of national of national legislation. It concludes by making some preliminary suggestions regarding the development of legal and institutional frameworks for soil management in Balkan countries.
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Hopmans, P., N. Collett, and R. Bickford. "Effects of fire retardant on heathland soils in south-eastern Australia." Soil Research 45, no. 8 (2007): 607. http://dx.doi.org/10.1071/sr07040.
Повний текст джерелаАнотація:
A study was undertaken to assess the effects of fire retardant application, unmodified by heat of fire, on soil properties in 2 fire-prone heathland communities at Marlo and the Grampians in south-eastern Australia. Fire retardant (Phos-Chek D75-R at 0.144 g/L) was applied at rates of 0.5, 1.0, and 1.5 L/m2 and compared with control treatments of nil and 1.0 L/m2 of water. Monitoring of surface soils showed that pH at both sites decreased while soil salinity increased immediately after application followed by a rapid decline to pre-treatment values within 12 months. The impact of retardant on total carbon and nitrogen was minor and within the range of natural variation of C and N in surface soils at both sites. Levels of readily available or labile forms of N increased at both sites but declined rapidly to background values after 12 months. Applications of retardant progressively increased extractable P in the surface soil at Marlo, in contrast to the Grampians where a rapid increase was observed after two months followed by a decline after 12 months. These results showed a significant increase in labile P in the surface soil after 12 months and also indicated that a large proportion of the phosphate applied had leached into the subsoil. Likewise, fire retardant applied at the highest rate caused increases in labile sulfate after 2 months at both sites, followed by a rapid decline to background levels. It is expected that the elevated levels of soil phosphate in particular could have a long-term impacts on growth and composition of heathland vegetation known to be sensitive to elevated levels of phosphate in soil.
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Ruprecht, JK, and NJ Schofield. "In situ neutron moisture meter calibration in lateritic soils." Soil Research 28, no. 2 (1990): 153. http://dx.doi.org/10.1071/sr9900153.
Повний текст джерелаАнотація:
An in situ calibration procedure for complex lateritic soils of the jarrah forest of Western Australia is described. The calibration is based on non-destructive sampling of each access tube and on a regression of change in water content on change in neutron count ratio at 'wet' and 'dry' times of the year. Calibration equations with adequate precision were produced. ever, there were high residual errors in the calibration equations which were due to a number of factors including soil water variability, the presence of a duricrust layer, soil sampling of gravelly soils and the variability of the cement slurry annulus surrounding each access tube. The calibration equations derived did not compare well with those from other studies in south-west Western Australia, but there was reasonable agreement with the general equations obtained by the Institute of Hydrology, U.K.