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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/24617

Title: Climate Change Impacts on the Molecular-level Carbon Biogeochemistry in Arctic Ecosystems
Authors: Pautler, Brent Gregory
Advisor: Simpson, Myrna J.
Department: Chemistry
Keywords: biogeochemistry
soil organic matter
sedimentary organic matter
biomarkers
gas chromatography-mass spectrometry
nuclear magnetic resoances spectroscopy
Issue Date: 27-Jul-2010
Abstract: The goal of this thesis was to characterize and quantify changes to Canadian Arctic organic matter (OM) induced by a physical disruption to the permafrost active layer by employing molecular-level techniques such as biomarker extraction and NMR to help elucidate its contribution to carbon turnover and global climate change. The initial biomarker characterization study determined that the extractable plant lipids were unaltered originating from the deposition of new vascular material or permafrost melt where a high alteration of lignin-derived OM was observed suggesting a long residence time in the ecosystem. Analysis of samples where there was a new and historical physical disruption to the permafrost landscape showed an initial increase in bacterial biomass biomarkers, and was corroborated with increased bacterial protein contributions and peptidoglycan signals in the NMR spectra. It is hypothesized that this increase in bacterial biomass resulted in a faster rate of degradation, possibly leading to OM priming.
URI: http://hdl.handle.net/1807/24617
Appears in Collections:Master
Department of Chemistry - Master theses

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