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 “"labile organic matter"”.
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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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The role of denitrification in the nitrogen cycle of New England salt marshes
… these sediments was driven by the degradation of labile organic matter pools which are depleted during long incubations. Sediment thickness was the most important parameter controlling the required incubation time. Errors of up to 13% with gas headspaces and 80% with water headspaces resulted from …
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Import and decomposition of dissolved organic carbon in pre-dams of drinking water reservoirs
Dissolved organic carbon (DOC) depicts a key component in the aquatic carbon cycle as well as for drinking water production from surface waters. DOC concentrations increased in water bodies of the northern hemisphere in the last decades, posing ecological consequences and water quality problems. …
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Spatial and Temporal Transitions in the Composition and Transport of Carbon under Variable Flow
Recent studies have focused on dissolved organic matter (DOM) cycling throughout river corridors or in reservoirs, but few have explored DOM cycling in commonplace but understudied run-of-river (ROR) reservoir systems. Impoundments disrupt river flow patterns, as they increase hydraulic residence …
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Hydrological and biogeochemical cycling along the Greenland ice sheet margin
… to interpret and quantify glacially-derived organic carbon and iron fluxes. I combine bulk- and molecular-level studies of subglacial organic carbon to show that GrIS discharge exports old (radiocarbon depleted), labile organic matter. Similar investigations of dissolved and particulate iron …
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Hydrological and biogeochemical cycling along the Greenland ice sheet margin
… to interpret and quantify glacially-derived organic carbon and iron fluxes. I combine bulk- and molecular-level studies of subglacial organic carbon to show that GrIS discharge exports old (radiocarbon depleted), labile organic matter. Similar investigations of dissolved and particulate iron …
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The role of denitrification in the nitrogen cycle of New England salt marshes
… these sediments was driven by the degradation of labile organic matter pools which are depleted during long incubations. Sediment thickness was the most important parameter controlling the required incubation time. Errors of up to 13% with gas headspaces and 80% with water headspaces resulted from …
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Biogenic Tracers Through the Holocene on the Alaskan Shelf
… (2) identify the major sources of biogenic matter into the system over the Holocene, and (3) assemble the history of depositional events that have occurred in the Alaskan shelf over the Holocene.</p> <p>The C/N and δ<sup>13</sup>C in the very earliest record at Station 5, 12,000 ybp, suggest …
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Effects of anthropogenic land use on temperate mangrove forests
… chapter investigates environmental controls on organic matter degradation in mangrove forests. Results from this study emphasize the importance of considering multiple factors influencing degradation processes, that vary with the quality of the decaying organic matter. Furthermore, using the …
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CHARACTERIZATION OF OYSTER-ASSOCIATED BIOGEOCHEMICAL PROCESSES IN OYSTER RESTORATION AND AQUACULTURE
… and positive relationships for dissolved inorganic carbon (DIC) and N2, and no significant relationship for NOx or soluble reactive phosphorus (SRP). Above a restored oyster reef, time series and ensemble-averaged normalized profiles from in situ methods reveal that oxygen was removed, …
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Effect of rotation, organic inputs and tillage on crop performance and soil quality in conventional and low-input rotations in central Iowa
… to be driven by the amount and placement of organic residues and to fluctuate with tillage and cropping phase. On a system basis, particulate organic carbon (POM-C) and potentially mineralizable nitrogen (PMN) were increased in both LEI rotations relative to a two year (2-yr) corn (Zea mays …
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Effects Of Calcium Addition On Structure And Bioavailability Of Soil Organic Matter
… to study the effects of these amendments on soil organic matter and soil microbes, I characterized the structural chemistry of soil organic matter (SOM) and its hot-water extractable organic matter (HWEOM) fraction for Hubbard Brook soils and studied the changes in the structure of SOM and HWEOM …
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Lipid profiles of deep-sea organisms
… with a reliance on phototrophically derived organic matter. This result supports previous molecular evidence that Rimicaris exoculata travels between hydrothermal vents on the Mid-Atlantic Ridge. The branchial area of Rimicaris exoculata has been reported to be colonised with bacteria and …
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El papel ecológico de los materiales orgánicos alóctonos en las comunidades de macroinvertebrados en playas atlánticas arenosas: patrones espaciales y temporales
Accumulations of seagrass, macroalgae and other organic materials, collectively known as wrack, commonly occur on sandy beaches worldwide, and are critical to the functioning of these ecosystems. On the upper beach, the deposition of wrack debris provides habitat and food for rich supralittoral …
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Do Roots Bind Soil? Comparing the Physical and Biological Role of Plant Roots in Streambank Fluvial Erosion
… were also created to represent unamended and organic matter (OM) amended soil either without roots (bare soil), with synthetic roots, or with living roots (Panicum virgatum). Median soil erosion rates along the simulated rooted boundaries were two to ten times higher compared to the …