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 “"terrestrial organic matter"”.
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The temporal dynamics of terrestrial organic matter transfer to the oceans : initial assessment and application
… carbon and radiocarbon isotopic analysis of organic biomarkers to (a) resolve petrogenic from pre-aged vascular plant organic carbon (OC) in continental margin sediments, (b) investigate the underlying mechanisms controlling the anomalously old ages that are often observed for the terrestrial …
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The temporal dynamics of terrestrial organic matter transfer to the oceans : initial assessment and application
… carbon and radiocarbon isotopic analysis of organic biomarkers to (a) resolve petrogenic from pre-aged vascular plant organic carbon (OC) in continental margin sediments, (b) investigate the underlying mechanisms controlling the anomalously old ages that are often observed for the terrestrial …
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An Assessment of the Contribution of Terrestrial Organic Matter to Total Organic Matter in Sediments in Scottish Sea Lochs
… by using lignin as the biomarker for terrestrial organic matter. The oxygen uptake rate, percentage organic matter due to loss on ignition, Rp index, total carbon, total organic carbon (TOC), total nitrogen, C/N<br/>ratio, and phosphate content were used as the proxies to determine the …
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Assembly and functioning of microbial communities along terrestrial resource gradients in boreal lake sediments
Terrestrial inputs of organic matter contribute greatly to the functioning of aquatic ecosystems, subsidizing between 30-70% of secondary production. This contribution of terrestrial resources is especially important in boreal lakes that are largely nutrient-poor and thus more responsive to these …
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Comprehensive Analysis of Effluent Organic Matter from Five Wastewater Treatment Plants in Connecticut and Comparison to Natural Organic Matter
<p>Natural organic matter is an important driver of biotic and abiotic processes in aquatic environments. Wastewater treatment plants discharge a substantial amount of organic matter into the environment; however effluent organic matter has not been well studied. In this study, traditional organic …
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Transport and decomposition of allochthonous litter in Icelandic headwater streams: Effects of forest cover
… ecosystems, especially through transport of terrestrial organic matter into them. The objectives of the present study were to compare non-forested and forested catchments in Iceland in terms of litter transport into streams and litter decomposition within them. This was the first study made …
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Linking Carbon Dynamics in Stream Ecosystems to Dissolved Organic Matter Quality
… form of CO2 from groundwater, streams receive organic matter from aquatic and terrestrial origins which is partly mineralized to inorganic nutrients and CO2. Future predictions suggest enhanced input of terrestrial organic matter into streams. As such, surrounding land use may highly influence …
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Uncovering the Potential of Utilising Terrestrial Biogenic Markers in Ice Cores as Proxies to Past Environmental Conditions
… rings) do not. Limited research has focussed on terrestrial organic matter within ice cores. However, given the known relationships between terrestrial organic matter and the environment, there is a potential that investigating these compounds within ice cores could uncover a wealth of …
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From land to water: the impacts of forest disturbances on carbon cycling in northern catchments
Boreal forests hold 32% of the world’s terrestrial organic matter and are continually disturbed by biotic and abiotic events. These disturbances are especially important since they facilitate the redistribution of nutrients within and between ecosystems, which can alter resource use and …
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Advances in Amino Acid Analysis for Marine Related Matrices and Its Application to Coastal Shelf Settings in The Canadian Arctic
<p>Amino acids comprise up to 50% of organic matter in cellular material and are a major fraction of oceanic organic carbon. Amino acids are also considered highly labile during organic matter recycling, making them useful proxies for organic carbon cycling. Nevertheless, analysis of individual …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… marine derived nutrients (MDN) to freshwater and terrestrial ecosystems through multiple trophic pathways. Sockeye salmon (O. nerka) rear extensively in lakes and recent studies of sockeye nursery lake sediments in Alaska have used indicators of spawner density (ä15N) and algal production (fossil …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… marine derived nutrients (MDN) to freshwater and terrestrial ecosystems through multiple trophic pathways. Sockeye salmon (O. nerka) rear extensively in lakes and recent studies of sockeye nursery lake sediments in Alaska have used indicators of spawner density (ä15N) and algal production (fossil …
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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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Biogeochemistry and inorganic geochemistry as indicators of the paleoenvironment and paleohydrology of the Al-Azraq Basin, Jordan
This study investigates the biogeochemical and inorganic geochemical indicators for past environments and paleohydrology of a high resolution sediment record from the Al-Azraq Basin, Jordan. The second largest basin in Jordan, it is an important aquifer for a majority of the population in this arid …
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Mechanisms of terrestrial organic carbon export and preservation in the marine environment
Export of terrestrial carbon from land to sea is a globally important carbon flux that is poorly constrained and has implication for atmospheric carbon levels over modern and geologic timescales. Many factors control the fate of exported carbon and the subsequent impact on carbon budgets, including …
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A multi-scale assessment of aquatic ecosystem processes across the land-ocean-atmosphere continuum: from headlands to the sea
… unique cross-section of earth processes, linking terrestrial, aquatic, marine, and atmospheric reservoirs. Once thought to be passive pipes connecting land to sea, rivers are increasingly recognized as dynamic players in global carbon cycling. Rainfall mobilizes terrestrially-derived components …
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Mechanisms of terrestrial organic carbon export and preservation in the marine environment
Export of terrestrial carbon from land to sea is a globally important carbon flux that is poorly constrained and has implication for atmospheric carbon levels over modern and geologic timescales. Many factors control the fate of exported carbon and the subsequent impact on carbon budgets, including …
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Ecophysiology and Food Web Dynamics of Spring Ecotone Communities in the Edwards Aquifer, USA
Spring orifices serve as ecotones between groundwater and surface water habitats. It is thought that organisms living in physicochemically stable spring ecotones should exhibit small tolerance ranges; however, previous experiments examining this prediction are equivocal. I examined this hypothesis …
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Food webs in the lower Waikato River and the role of hydrogeomorphic complexity
… carbon flow in large river food webs where organic matter from floodplains (Flood Pulse Concept), local aquatic sources (Riverine Productivity Model), or leakage from upstream processing of terrestrial organic matter (River Continuum Concept) can fuel secondary production. Recent empirical …
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Mineralogy and geochemistry of the carbonaceous mudstones and coal petrogenesis of the Grootgeluk formation in the Waterberg coalfield, South Africa
… The maceral variation of the coal seams and the organic matter in the mudstones reveal that conditions for the preservation of organic matter were more suitable during the deposition of the sediments in the upper (vitrinite-rich) rather than the lower (inertinite-rich) Grootegeluk Formation. At …
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