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 21 for “"Agro-Ecosystem"”.
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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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Productivity, physiology, community dynamics, and ecological impacts of a grassland agro-ecosystem: integrating field studies and ecosystem modeling
Grasslands are among the largest ecosystems in the world and provide numerous ecosystem services. These services include the ecosystem benefits important in an agricultural context such as biomass production and benefits from an ecological perspective such as mitigation of greenhouse gas emissions. …
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The impact of land-use and global change on water-related agro-ecosystem services in the midwest US
… landscape through the conversion of natural ecosystems into agriculture, and the atmosphere through the combustion of biomass and fossil fuels to meet the need for food and energy. Associated with these land use and global changes are major alterations in the biogeochemical cycles of carbon, …
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Modeling and analysis of management for an agro-ecosystem using an agent-based model interface for the soil and water assessment tool (SWAT)
… the Gulf of Mexico, is undermining the health of ecosystems, economies, and public health. Agricultural production in the watershed has been identified as the dominant factor contributing to poor water quality. Substantial investment by communities, governments, and research is dedicated to …
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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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Some observations on the population dynamics of the Australian soldier fly Inopus Rubriceps Macquart (Diptera: Stratiomyidae)
… management programme to be used in a pasture agro-ecosystem. At that time, there was an almost complete lack of knowledge about any aspect of the insect’s biology and ecology under N.Z. pasture conditions. The above, together with the failure to find a suitable chemical control from several …
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Advancing detection, genomics, and secretome analysis of oomycete pathogens Phytophthora capsici and Phytopythium vexans to explore mechanisms of pathogenesis and biocontrol solutions
… a niche adaptation to a specific Canadian agro-ecosystem. The final component of this thesis focuses on the development of an amplitude-based multiplex droplet digital PCR (ddPCR) assay. Designed for simultaneous quantification of P. capsici, Trichoderma asperellum, and Trichoderma gamsii …
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Incidence, Distribution and Characteristics of Major Tomato Leaf Curl and Mosaic Virus Diseases in Uganda
… tomato yields (10 ton/ ha) are low due to poor agronomic practices, lack of high yielding and disease resistant varieties, and pests (Varela, 1995; Hansen, 1990; Defrancq, 1989). Viral diseases are the third major cause of low tomato productivity in Uganda. Therefore, a survey was conducted; …
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Sustainable natural resource management in regional ecosystems : case studies in semi-arid and humid regions
… resource utilization in semiarid and humid ecosystems in short and long term. To achieve this goal, two studies were implemented. First, sustainable land use management was evaluated in a newly reclaimed, semiarid region in the Bustan 3 area (341.27 km2), Egypt. To achieve sustainable …
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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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Essays on Water Policy and Coupled Human and Natural Systems
Human and freshwater ecosystems are intrinsically interconnected. To better design effective policies, modeling tools and valuation methods are necessary to help understanding the complex reciprocal linkages between ecosystem processes and human actions, and coupled human and natural systems (CNHS) …
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Impacts of global warming and rising atmospheric CO2 concentrations on physiology, development and productivity of Midwestern crops
… life on Earth. The impact of these changes on agro-ecosystem is particularly important as we rely on agriculture for food, fiber, and renewable energy, the demand for which is increasing as human population rises. Photosynthesis is the primary means by which plants sense rising atmospheric …
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Indigenous approaches to forecasting rainfall for adaptation of Bambara nuts (vigna subterranea) production practices in selected villages of Vhembe District
… insecurity with V. subterranea being part of the agro-ecosystem deserve attention in scientific investigation and policymaking.
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The colonisation of canola crops by the diamondback moth, Plutella xylostella L., in southern Australia
… of P. xylostella in the Australian canola agro-ecosystem, or the contribution of movement to seasonal outbreaks and the spread of insecticide resistance. The recent discovery of an endemic cryptic species, Plutella australiana Landry & Hebert, raised questions about the relative pest status …
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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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An Impact Assessment of Agro-Ecology on Climate Change Mitigation and Economic Sustainabilty: A Case of Mopani District
See the atttached abstract below
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Plant communities in field margins of agricultural landscapes: species distributions, functional traits, and contributions to landscape function
… as they are contributing positively to ecosystem functions by supporting biodiversity, preventing soil erosion, contributing in nutrient cycling and improving soil stability. This thesis is aiming to further our understanding of the processes governing plant community structure and …
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A multifarious comparative ecotoxicological approach on a catchment scale from three mine wastelands for improved environmental management and risk assessment: integrating abiotic, biotic and agroecosystem approaches
… from sulphidic ores, the impacts on the aquatic ecosystem, the agro-ecosystem and potential ecological restoration using phytomining technologies. The study is focused on the Kafue River basin on the Zambian Copperbelt and seeks to identify impacts and potential benefits through studying a …
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Characterization of Hessian fly from Israel
… with micropopulation differences due to agro-ecosystem parameters such as cultivation of regionally adapted wheat varieties, deployment of resistance genes, and variation in climatic conditions. Hf larvae produce a large number of secreted salivary effector proteins involved in effector …
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Dichlorodiphenyltricholorethane (DDT) resistance mechanisms in Drosophila melanogaster and applications for the cowpea pest Clavigralla tomentosicollis
… patterns of this species in the West African agro-ecosystem. The ultimate aim will be the ability to improve pest management choices through an increased understanding of population dynamics and migration patterns for a pest of a crop that is an important food source across sub-Saharan Africa.
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