Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Agro-ecosystems."”.
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The Environmental Fate and transport of Trenbolone Acetate Metabolites in Agro-Ecosystems
… of TBA metabolites that could transport from agro-ecosystems to receiving waters. Observed leaching of 17a-TBOH from manure during irrigation closely matched estimates made from a 1-D diffusional model, suggesting that leaching during irrigation was diffusion limited. When applied to rainfall …
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Biochar amendment as a tool for improving soil health and carbon sequestration in agro-ecosystems
… to variation in the carbon balance of each agro-ecosystem. Biochar made from softwood lumber scraps performed best, with the highest net carbon storage and lowest global warming potential, followed by biochar made from hardwood scraps. Hay biochar performed worst, with positive carbon …
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Analysis of the ground Coleoptera communities of agro-ecosystems within the Oriented Natural Reserve Pino d Aleppo (Ragusa, Sicily) and their use for assessing the environmental quality
… ground Coleoptera communities of three different agro-ecosystems: Arable land with Carob trees (AC), Olive grove (Ol) and Citrus grove (Ci) and of a residual patch of Mediterranean maquis (Tk) investigated by pit-fall traps. Therefore, the study focused on Coleoptera, for which has been developed …
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Ecology and Management of Riceland Mosquitoes in Africa With Special Reference to Culex Quinquefasciatus
… mosquito species occurring in African rice agro-ecosystems have been scarcely studied despite the strong link between irrigated rice cultivation and mosquito-borne disease. Studies were conducted to determine the ecology of rice-land mosquitoes in Mwea rice agro-ecosystem, Kenya. In the …
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Assessing the impacts of environmental stressors on watershed ecosystem services integrating hydro-ecologic models and socio-cultural perspective
Ecosystems have been subjected to an accelerated fragmentation and degradation due to the expansion and intensification of agricultural activities to produce food and other commodities to satisfy the needs of an increasing population. Therefore, the sustainability of agro-ecosystems is an urgent …
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Food foraging in adult parasitoid Cotesia rubecula : how sugar sources contribute to survival and reproduction / by Gitta Siekmann.
… This has implications for flower propagation in agro-ecosystems with a view to supporting natural enemies of insect pests.
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Land Cover Land Use Change and Soil Organic Carbon Under Climate Variability in the Semi-Arid West African Sahel (1960-2050)
… carbon is a key component for the functioning of agro-ecosystems and has a direct effect on the physical, chemical and biological characteristics of the soil. The capacity to model and project LCLU change is of considerable interest for mitigation and adaptation measures in response to climate …
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Multi-scale analysis of carbon stocks and process indicators in the agro-ecosystem of Canterbury, New Zealand
… available about carbon stocks and processes in agro-ecosystems. Better understanding of carbon stocks and processes is of particular importance in New Zealand, where farmland occupies large areas across the country and ongoing change in farming practices, land management and intensification are …
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Interactive effects of elevated carbon dioxide concentration with nutrient availability and leaf development on plant carbon metabolism
… crop yields, and the ability of terrestrial ecosystems to offset ~2-3 Gt CO2 yr -1 of anthropogenic emissions. Rising atmospheric CO2 concentration ([CO2]) this century will impact plant photosynthesis and respiration with consequences for plant productivity in natural and agro-ecosystems. …
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A polymerase chain reaction and denaturing gradient gel electrophoresis procedure for analysis of arbuscular mycorrhizal fungi in soil
… fungi (AMF) are important components of agro-ecosystems and are especially significant for productive low-input agriculture. Traditional spore morphology-based identification of AMF in biodiversity studies is subjective and requires expertise and time. Researchers have used molecular …
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Evaluation and Application of the Community Land Model for Simulating Energy and Carbon Exchange in Agricultural Ecosystems
… the interactions between the atmosphere and ecosystems, understanding biophysical feedback processes, and predicting future climate. Most state-of-the-art LSMs assessed in the fifth phase of the Coupled Model Inter-comparison project (CMIP5), however, did not include process-based crop models …
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Enhancing the benefits to biodiversity and ecosystem services within arable field margins
… of additional ecosystem services of societal and agronomic importance, but this has yet to be established. Furthermore, the ability of forb-rich field margins to deliver multiple benefits (i.e. ecosystem multifunctionality), including pest control and pollination, is likely to be contingent on a …
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On farms and in laboratories: maize seed technologies and the unravelling of relational agroecological knowledge in South Africa
… and disconnected from the specificities of local agroecosystems. Like all technologies, maize seed technologies are not neutral but are rather deeply entangled in the history and politics of knowledge production. Commercial technologies such as hybrid and GM seeds are products of a particular …
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How vertebrate communities affect quality and yield of macadamia farms in Levubu, South Africa
… and disservices are important features in agro-ecosystems and both can have relevant economic impacts on farmers. While there has been much research on the value of ecosystem services, especially that of pest control by bats and birds, ecosystem disservices are often overlooked or estimated …
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Natural zeolitites in combination with struvite precipitation technology for the recovery of nutrients from agricultural wastewaters
… “how to improve the recycling of nutrients in agro-ecosystems”, remains thus a crucial topic for the sustainability of human activities. A promising technology consists in the precipitation of struvite crystals for the recovery of both nitrogen (N) and phosphorous (P). But, even if these …
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Regulatory mechanisms underlying C3 carbon and nitrogen metabolism under elevated CO2
… turn impacting plant productivity in natural and agro-ecosystems in the future. Several interacting environmental and genetic factors affect species-specific response to C gain under elevated atmospheric CO2 concentration (eCO2). One of the many challenges faced in understanding these interaction …
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Agroecosystem management strategies and trophic interactions among herbivores, pathogens and predators
… the restoration of vegetation diversity in agroecosystems and the adoption of management strategies aiming to reduce impacts on natural enemy populations are practices that can be employed in different types of farming systems. Much of the conservative biological control efforts are focused …
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Understanding the relationship between agricultural nutrients NPS, land management, and climate using distributed hydrologic models
… to public health and critical stress to the agroecosystem because of the high fertilizer loss. To mitigate the excessive nutrient loading in our water bodies, different land management schemes have been developed and implemented to reduce N and P NPS in the agroecosystem, but the …
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THE ROLE OF ADAPTATION AND INFORMATION IN AGRICULTURAL SUSTAINABILITY AND RESILIENCE
… These can result in severe damage to watersheds, ecosystems, and communities. Climate change adaptations are vital to the maintenance of both sustainability and resilience of agro-ecosystems during severe weather events. They can allow agricultural producers to maintain the many functions of these …
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Modelling impacts of climate variability and change on wheat cropping across New South Wales
… it is essential to link spatial information of agro-resources and crop simulation model to assess crop growth in response to agricultural management and environmental variation. The outcomes of this project will enhance the capability of farmers and policy makers to adapt and manage farm …