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 24 for “"organic matter decomposition"”.
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Experimental litterfall manipulation effects on soil bacterial community structure and soil carbon cycling in a wet tropical forest
… from differences in C availability affect organic matter decomposition and how soil C pools and fluxes respond to shifts in C inputs, I utilized an in situ litter manipulation experiment in a tropical rain forest in Costa Rica. In one study, I assessed whether changes in bacterial community …
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Experimental litterfall manipulation effects on soil bacterial community structure and soil carbon cycling in a wet tropical forest
… from differences in C availability affect organic matter decomposition and how soil C pools and fluxes respond to shifts in C inputs, I utilized an in situ litter manipulation experiment in a tropical rain forest in Costa Rica. In one study, I assessed whether changes in bacterial community …
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Automated Plant Morphological Assessment and Microbial Community Monitoring in Simulated Lunar Regolith
… regolith lacks essential nutrients, requiring organic amendments to support continuous plant cultivation. This study examined the impact of manure-amended lunar regolith simulant on Mizuna mustard growth while assessing microbial community diversity and functionality. To support this effort, a …
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Hierarchical Variation in Cellulose Decomposition Across Southern Ontario Reference Streams
… into standardized river assessments by study of organic-matter decomposition. However, operationalization of the CSA as an indicator requires testing the spatial and temporal controls of variance associated with decomposition of cotton strips at regional reference sites. I conducted a …
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Towards a paradigm shift in the modeling of soil organic carbon decomposition for earth system models
… and enzyme kinetics that catalyze soil carbon decomposition produce notably different results and provide a closer match to recent observations. However, a systematic evaluation of the advantages and disadvantages of the microbial models and how they differ from empirical, first-order …
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Impacts of the Deepwater Horizon Oil Spill on Microbial-Mediated Cellulose Decomposition in Mississippi Gulf Coast Salt Marshes
… Deepwater Horizon oil spill on rates of marsh organic matter decomposition.<em> </em>Decomposition in surface and subsurface marsh sediments was assessed in stands of <em>Spartina alterniflora</em> and <em>Juncus roemerianus</em> in 9 Mississippi Gulf Coast marshes exposed to differing oiling …
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Environmental and developmental regulation of carbon cycling in a warm-temperate forest
… of C belowground, accelerated the rate of soil organic matter decomposition and increased nitrogen uptake from the soil through a priming mechanism. As a consequence of accelerated rates of soil organic matter decomposition, the aboveground C sink in biomass was maintained, but no additional C …
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Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude
… waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been fully explained yet. As causes reduced microbial activity and nitrogen turnover in soils of …
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Microbial Communities Colonizing Leaves during Early Decomposition Stages
… bacteria and fungi are main drivers of organic matter decomposition and thus partly responsible for facilitating the cycling of nutrients from leaves that fall into the stream. The main objective of this study was to compare microbial community composition between different leaf types …
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Tradeoffs among ecosystem services in restored wetlands
… We measured denitrification potential, soil organic matter decomposition, aboveground herbaceous biomass, and soil organic content as proxies for nutrient-storage and removal services. Additionally, flood water storage potential was calculated using detailed LiDAR and topographic data. Since …
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Impact of extreme hydrological conditions on belowground carbon cycling and redox dynamics in peat soils from a northern temperate fen
… term carbon accumulation is the relative low decomposition of organic matter in these predominantly water logged ecosystems. Hydrological conditions play thus a fundamental role in peatlands and the feedback of carbon cycling in these ecosystems in response to climate change is under debate. …
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Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed
… bank stability, biological communities and organic matter processing in response to habitat enhancing structures; 2-relate changes in structural and functional attributes of the Little Coal River mainstem to losses resulting from mining impacts to headwater catchments; and 3-develop a long …
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Nutrient constraints on plant community production and organic matter accumulation of subtropical floating marshes
… nutrient cycling controls plant productivity and organic matter accumulation. An interesting question is whether increased external nutrient loading can affect the basic processes that lead to peat formation—plant production and organic matter decomposition. I conducted several field studies to …
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Microbial and metazoan effects on nutrient dynamics during leaf decomposition in streams
… cycling by heterotrophic microbes during leaf decomposition in streams. My research addressed two overarching questions: 1) how do exogenous and endogenous factors interact to drive microbial nitrogen (N) cycling during organic matter decomposition in stream ecosystems, and 2) what affect will …
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Effects of experimentally-altered hydrology on ecosystem function in headwater streams
… questions that I addressed included: 1) How is organic matter decomposition regulated by changes to the availability of water? and 2) How does the relationship between nutrient uptake and metabolism change under conditions of varying water availability? The availability of water (as discharge) …
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Changes in soil properties under experimental tree plots on the Isle of Rum
… mineral soils at Harris and the less fertile, organic soils at Kilmory Fank. Significant changes in soil characteristics were identified beneath all three species growing on both soil types. These changes were complex in nature. The effects of oak and birch growth could not uniformly be said to …
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Methane-cycling microbial communities in permafrost affected soils on Herschel Island and the Yukon Coast, Western Canadian Arctic
… regions in which current microbial controls on organic matter decomposition are likely to change as a result of global warming. Wet tundra ecosystems in particular are ideal sites for increased methane production because of the waterlogged, anoxic conditions that prevail in seasonally increasing …
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Dynamics and Characterization of Soil Organic Matter on Mine Soils 16 Years after Amendment with Topsoil, Sawdust, and Sewage Sludge
… using the following key soil quality variables: organic matter content, aggregate stability, and mineralizable nitrogen, (ii) to determine the effects of these key soil quality variables on plant productivity, and (iii) to determine the comparative ability of trees and herbaceous plants to …
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Effect of mass wasting on soil organic carbon storage and coastal erosion in permafrost environments
… by permafrost store high amounts of soil organic carbon (SOC). Permafrost disturbances may contribute to increased release of carbon dioxide and methane to the atmosphere. Coastal erosion, amplified through a decrease in Arctic sea-ice extent, may also mobilise SOC from permafrost. Large …
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