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 138 for “"carbon cycling"”.
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Cryogenic carbon cycling at an Icelandic glacier
… as an important component of the global carbon cycle. Carbon within glacial systems exists in organic and inorganic forms, across supraglacial, englacial and subglacial realms. It is often difficult to detach cryospheric carbon cycling from hydrology, with the transfer of carbon between …
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Carbon cycling and functional redundancy in closed microbial ecosystems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Restoration of nitrogen and carbon cycling in an Appalachian mine spoil
… restoration of forests by increasing the N cycling capacity of the developing mine-soil system.
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine sediment cores to …
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Organic Carbon Cycling in East China Sea Shelf Sediments: Linkages with Hypoxia
… of sediment and terrestrial derived organic carbon (OC) to the Changjiang large delta-front estuary (LDE) in the East China Sea (ECS). This study analyzed bulk OC, biomarkers including lignin and plant pigment, black carbon (BC) on ECS sediments sampled in winter 2009 and 2010 in order to …
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Carbon cycling in secondary tropical dry forest from species to global scales.
Tropical forests are important in the global carbon cycle but questions remain about the distribution of carbon stocks and the controls over carbon cycle processes in these forests. This is especially true with tropical dry forests which comprise as much as 43% of global tropical forests, but have …
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Environmental and developmental regulation of carbon cycling in a warm-temperate forest
… twelve years of research on belowground C and N cycling at Duke FACE in an attempt to mechanistically explain two phenomena: (1) there has been no increase in soil C despite 12 years of increased C inputs to soils under elevated CO2, and (2) the trees have increased soil N acquisition under …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine sediment cores to …
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Elevation Effects on Key Processes of Carbon Cycling in South Ecuadorian Mountain Forests
Diese Studie über Wälder Süd-Ecuadors hat das Ziel große Wissenslücken zu füllen, den Kohlenstoffkreislauf montaner Regenwälder in einer Meereshöhe von 1000 bis 3000 m betreffend. Besondere Aufmerksamkeit wurde dabei auf den bisher unbekannten Kohlenstoffumsatz durch Feinwurzeln, Stammholzzuwachs …
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Relative Role of Uncertainty for Predictions of Future Southeastern U.S. Pine Carbon Cycling
Predictions of how forest productivity and carbon sequestration will respond to climate change are essential for making forest management decisions and adapting to future climate. However, current predictions can include considerable uncertainty that is not well quantified. To address the need for …
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The response of grassland carbon cycling to drought events and changes in nutrient availability
… services, including agricultural production, carbon (C) storage and nutrient cycling. In particular, climate change is likely to increase the frequency and severity of extreme climate events, such as drought and the subsequent rewetting event. Yet the effect of drought events will not be …
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Carbon Cycling Dynamics Inferred from Carbon Isotope Sourcing in a Mid-Latitude Karst-Influenced River
<p>As ever-increasing levels of carbon dioxide alter the chemistry of the Earth’s atmosphere, understanding the global carbon cycle becomes increasingly important. A particularly important component is the riverine carbon cycle, as rivers are the primary conduits for dissolved inorganic carbon from …
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Carbon cycling: The role of Methane and Copper in an early ocean analogue Lake Matano
This dissertation examines the carbon cycle of a modern ferruginous environment (Lake Matano, Indonesia), with a primary focus on the critical role of methane in carbon redistribution in this system. In addition, the mobility and availability of copper (Cu) (an essential component of microbial …
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Stable isotopic insight into pelagic carbon cycling in Loch Lomond: a large, temperate latitude lake.
Lakes play an important role in biosphere carbon dynamics. Though proportionally they constitute a small surface feature on the planet, in many cases lakes are subject to significant subsidies of organic material from their catchments. This input of allochthonous organic material, in addition to …
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From land to water: the impacts of forest disturbances on carbon cycling in northern catchments
… resource balances, primarily through shifts in carbon, to better facilitate management of forests under climate change. Chapter 1 reviews current knowledge on forest disturbances and cross- ecosystem linkages. It also provides a summary of current gaps in our understanding of disturbances as …
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Assessing the role of soil chemoautotrophs in carbon cycling: An investigation into isotopically labelled soil microorganisms
… atmospheric CO2 have created great interest in carbon capture technologies and natural sinks of this major component of the carbon cycle. Humic substances are a large, operationally defined fraction of soil organic matter. It was thought that humic substances consist of cross-linked …
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Evaluating the interactions of crop management, carbon cycling, and climate using Earth system modeling and remote sensing
… activities with potentially large impacts on carbon (C) cycling and climate at the global scale. Improvements in crop management practices, such as conservation tillage or 'no-till' (NT), have been proposed as climate change mitigation measures because such practices may alter C cycles through …
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