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 18 of 18 for “"Agricultural ecosystems"”.
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Remote sensing-based assessment of Gross Primary Production (GPP) in agricultural ecosystems
Productivity in agricultural ecosystems is important to understand in terms of their role as a strong modifier of regional carbon balance, but also in their intended role of capturing carbon (energy) in the form of food products, e.g. agricultural yield. Gross primary production (GPP) of …
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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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Variabilité de la respiration hétérotrophe du sol dans des écosystèmes agricoles: Analyse à différentes échelles spatiales et temporelles.
… at different spatial and temporal scales in agricultural ecosystems in Belgium (loamy region). Results from both laboratory and field experiments conducted at short and long timescales were analysed with the aim to better understand the influence of driving variables such as temperature, …
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The Effects of dairy cattle antibiotics on soil microbial community cycling and antibiotic resistance
Antibiotic use in agricultural ecosystems has the potential to increase resistance to antibiotics in soil microbial communities since 40-95% of an antibiotic dose administered to livestock is excreted intact or as metabolites. Exposure to antibiotics is also known to alter microbial community …
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Development of an Autonomous Unmanned Aerial Vehicle for Aerobiological Sampling
… the movement of airborne plant pathogens in agricultural ecosystems is essential for developing rational approaches to managing these habitats. We developed an autonomous (self-controlling) unmanned aerial vehicle (UAV) platform for aerobiological sampling tens to hundreds of meters above …
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Efeito do extrato aquoso das folhas de Nim indiano (Azadirachta indica) sobre o crescimento inicial de plantas daninhas.
… plant species and has potential application in agricultural ecosystems. The aim of the study was to evaluate the occurrence of allelopathic action of Neem on weeds using experiments conducted in the Laboratory of Plant Ecology at the Center for Agricultural Sciences, Federal University of …
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Efeito do extrato aquoso das folhas de nim indiano (Azadirachta indica) sobre o crescimento inicial de plantas daninhas.
… plant species and has potential application in agricultural ecosystems. The aim of the study was to evaluate the occurrence of allelopathic action of Neem on weeds using experiments conducted in the Laboratory of Plant Ecology at the Center for Agricultural Sciences, Federal University of …
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Optimality and resilience in patterns of carbon allocation and growth in vegetation under acclimation response to climate change
… the consequences of this acclimation on agricultural ecosystems is critical in tackling future food security issues. In this study we investigate the acclimation response of an agricultural ecosystem and its impact on the hydrologic cycle. We further explore the effects of plant …
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Molecular Characterization of Stress Response in Western Honey Bee (Apis mellifera)
… of flowering plants and the sustainability of agricultural ecosystems. However, they face various stressors such as pesticides, pathogens, habitat loss, and climate change. Extensive research has been conducted to understand how bees respond to these stressors. Scientists have discovered that …
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Interactive effects of climate change and management on grassland greenhouse gas emissions
… particularly important for the sustainability of agricultural ecosystems due to its role in global food security and soil C sequestration. The interaction between climate warming and grassland management is highly important and needs to be addressed as it may change the direction and strength of …
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Effects of Organic and Conventional Agricultural Practices on Soil Microbial Communities and Molecular Detection of Soil Borne Disease
<p>Agricultural practices affect soil microbial communities and health through the input of pesticides, herbicides, fertilizers, and cycling of crop rotation. By examining the microbial community structure, we analyzed how microbial species respond to the environment that individual farms create. …
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Natural and Anthropogenic Drivers of Variation in Bumble Bee Gut Microbiotas
Bumble bees are key pollinators in natural and agricultural ecosystems. Like all social bees, their health is supported by a core gut microbiota consisting of a few, specialized bacterial phylotypes. The composition and community structure of bumble bee gut microbiotas can vary in response to …
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Implementation of genetic and untargeted metabolomics to study the role of the terpene synthase vir4 from Trichoderma virens in plant-microbe interactions : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
… interacts with plants roots in natural and agricultural ecosystems. Its ability to persist in the rhizosphere and to internally colonise plants roots is driven among others by the production of a wide diversity of specialised metabolites that encompass a complex bouquet of volatile organic …
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Ecosystem services provided by agricultural land as modeled by broad scale geospatial analysis
Agricultural ecosystems provide multiple services including food and fiber provision, nutrient cycling, soil retention and water regulation. Objectives of the study were to identify and quantify a selection of ecosystem services provided by agricultural land, using existing geospatial tools and …
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The effect of water stress and storage conditions on seed quality of chickpea genotypes characterized by differences in seed size and coat colour
… excellent utilizer of residual soil moisture in agricultural ecosystems. However, its seed quality and hence reproduction is constrained by water stress, seed size and storage conditions. This study was carried out at the University of KwaZulu- Natal (UKZN), Pietermaritzburg Campus. It was …
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Regenerative agriculture and landscape architecture: a promising partnership
… focused on biodiversity. Regeneration of our agricultural ecosystems, involves attention to four fundamental principles: 1. Rebuilding close relationships with both domestic and free-living species as critical to our community 2. Design which is not overly deterministic, and allows the site to …
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Soil microbial community dynamics associated with agricultural crops
… and manage the interactions that occur between agricultural crops and microbial communities that reside in the soil. Soil microbes regulate the decomposition of organic matter, the cycling of nutrients to crops and can induce systemic resistance. They also drive global biogeochemical cycles that …
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Impact of Oxygen and Pesticides on Microbial Cellulose Degradation in Aerated Agricultural Soils: A Microscaled Analysis of Processes and Prokaryotic Populations
… major component of organic matter in terrestrial ecosystems and its mineralization drives carbon fluxes in soil. The degradation of plant-derived saccharides (e.g., cellulose, cellobiose, and glucose) is catalysed by a huge diversity of aerobic and anaerobic microorganisms (including Bacteria, …