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environmental change, dendrochronology, stable isotope

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.





Autor: Mosher, Heather Mary Ruth

Fuente: https://era.library.ualberta.ca/


Introducción



University of Alberta Through the Eyes of a Tree: Monitoring Environmental Change Using Stable Isotope Dendrochemistry by Heather Mary Ruth Mosher A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science Department of Earth and Atmospheric Sciences © Heather Mary Ruth Mosher Spring 2013 Edmonton, Alberta Permissions 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 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 permissions. 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, re...





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