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Permanent link (DOI): https://doi.org/10.7939/R3PH9N

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Through they Eyes of a Tree: Monitoring Environmental Change Using Stable Isotope Dendrochemistry Open Access

Descriptions

Other title
Subject/Keyword
environmental change
dendrochronology
stable isotope
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Mosher, Heather Mary Ruth
Supervisor and department
Wolfe, Alexander P. (Earth and Atmospheric Sciences)
Examining committee member and department
MacKenzie, M. Derek (Renewable Resources)
Wolfe, Alexander P. (Earth and Atmospheric Sciences)
Gamon, John (Earth and Atmospheric Sciences and Biological Sciences)
Department
Department of Earth and Atmospheric Sciences
Specialization

Date accepted
2013-01-08T14:30:17Z
Graduation date
2013-06
Degree
Master of Science
Degree level
Master's
Abstract
Stable isotope dendrochemistry of needles, twigs, and tree rings were used to identify the impacts of a changing global atmosphere in two separate environments with different anthropogenic loads: the boreal forest surrounding the Athabasca Oil Sands region (AOSR), Alberta, Canada, subject to a large point source of anthropogenic emissions, and the relatively isolated alpine environment of Grand Teton National Park (GTNP), Wyoming, USA. In the AOSR, neither δ13C, δ15N, or the C/N ratio in needles and twigs identified the spatial extent of emissions, but tree ring chronologies did highlight shifts in the nitrogen cycle due to increased anthropogenic nitrogen deposition since the beginning of economic development. Alternately, stable isotope geochemistry of tree ring chronologies in the GTNP indicated a greater impact on ecosystem dynamics from increased levels of CO2 and climate change, reflecting water constraints and increased intrinsic water-use efficiency in trees. The ability of stable isotope dendrochemistry to record both nutrient cycle dynamics and physiological responses to the atmosphere makes it a valuable tool in monitoring the long-term effects of increasing anthropogenic emissions which will result in more pronounced impacts in the future.
Language
English
DOI
doi:10.7939/R3PH9N
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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