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 15 of 15 for “"organic matter dynamics"”.
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Organic Matter Dynamics and Trophic Structure in Karst Groundwater
… had little effect on respiring cells. Dissolved organic carbon was more abundant at the base of the aquifer, probably because of patchy distribution of particulate organic matter in upper aquifer zones that leached dissolved organic carbon. The temporal sequence of flooding and drying in the …
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Capturing and Characterizing Soluble Organic Matter Dynamics in Soil Formation Processes
Dissolved organic matter (DOM) is a highly complex, heterogeneous mix of compounds with diverse functional groups that contribute to several environmental processes such as organo-mineral complexation, nutrient bioavailability, and mineral dissolution. Because of these contributions of DOM to …
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Soil Organic Matter Dynamics in Cropping Systems of Virginia's Valley Region
Soil organic matter (SOM) is a well known indicator of soil quality due to its direct influence on soil properties such as structure, soil stability, water availability, cation exchange capacity, nutrient cycling, and pH buffering and amelioration. Study sites were selected in the Valley region of …
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Soil organic matter dynamics in a temperate forest influenced by extreme weather events
… on the region with effects on C cycling and soil organic matter (SOM). We investigated the influence of extreme weather events (frost/drought) on the quality and quantity of SOM in a Haplic Podzol under a 140 years old Norway spruce forest in the Fichtelgebirge mountains (Bavaria, German) within …
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Soil Structure and Organic Matter Dynamics: Influence of Tillage and Soil Physical Properties
Understanding structural controls over soil organic carbon (SOC) dynamics might improve our ability to predict inconsistent tillage influences on SOC sequestration. This research investigated the influence of soil structure on SOC mineralization and SOC fraction dynamics. A laboratory incubation …
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The Role of Floods in Particulate Organic Matter Dynamics of a Southern Appalachian River/Floodplain Ecosystem
I investigated the role of a flood in particulate organic matter (POM) dynamics of the Little Tennessee river/floodplain ecosystem in western North Carolina, USA. I measured litter inputs, leaf breakdown, floodplain litter, and aboveground herbaceous net primary production at 12 sites. Annual …
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Dissolved organic matter dynamics in diverse freshwater ecosystems across Canada: long-term trends, transformations, and explanatory factors
Dissolved organic matter (DOM) is a key variable in freshwater ecosystems that influences numerous limnological properties and ecosystem services. While DOM dynamics have received considerable attention in certain parts of Canada, many regions remain underexplored or require updated analysis. This …
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Spatial and Temporal Variability of In-Stream Functioning within a Forested, Headwater Piedmont Watershed
… particularly temperature, shading, and dissolved organic matter dynamics. This study therefore attempts to elucidate the effects of these environmental variables on nitrogen cycling within the Fair Hill Natural Resources Management Area (Fair Hill), a forested watershed within the Piedmont …
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Livestock Exclusion Effects on the Structure and Function of Headwater Streams
… riparian plant characteristics along with stream organic matter dynamics, benthic macroinvertebrates, algal biomass, and leaf breakdown in non-fenced, fenced, and forested streams. Increased growth of non-woody vegetation and the pre-existence of woody plants had a significant influence on stream …
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The hydroecology of groundwater-fed streams in a glacierised catchment
… determined the influence of groundwater flow dynamics upon benthic and hyporheic macroinvertebrate assemblages. During periods of resource depletion benthic macroinvertebrate abundance was dependent upon contributions from specific flow pathways (DFSdeep), which supplied fine particulate …
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Consequences of nitrogen fertilization and soil acidification from acid rain on dissolved carbon and nitrogen stability in the unglaciated Appalachian Mountains
… and nutrient recycling, the formation of soil organic matter (SOM), and the translation of elements through the biogeochemical continuum from atmospheric to soil to water. Results suggest that N deposition led to reduced organic matter C/N, enhanced net nitrification, and greater DON …
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Carbon and nitrogen cycling in watersheds of contrasting vegetation types in the Fernow Experimental Forest, West Virginia
… N stores, increased soil acidity, and altered organic matter dynamics, thus leading to low net nitrification rates. Carbon and N properties and processes in the soil profile should be taken into consideration in forests managed for ecosystem services including C sequestration and improvement or …
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An ephemeral perspective of fluvial ecosystems: Viewing ephemeral rivers in the context of current lotic ecology
Hydrologic and material dynamics of ephemeral rivers were investigated in the Namib Desert to assess how hydrologic regimes shape the physical habitat template of these river ecosystems. An analysis of long-term hydrologic records revealed that the variation in mean annual runoff and peak discharge …
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Biogeochemical Consequences of Hydrologic Conditions in a Tropical Montane Rain Forest in Ecuador
… (2) to quantify concentrations of dissolved organic C and organic and inorganic forms of N, P, and S, and (3) to identify the major controls of the dissolved C, N, P, and S dynamics in a tropical montane forest in south Ecuador. Three 8-13 ha large microcatchments (MCs) under montane forest …
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Influence of Agricultural Land Use on Allochthonous Input and Leaf Breakdown in Southern Appalachian Streams
… ecosystems are linked through allochthonous organic matter inputs from streamside vegetation. This allochthonous material makes up the energy base for forested aquatic food webs. Therefore, removal of riparian vegetation associated with agricultural land use affects stream ecosystem structure …