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dc.contributor.supervisor Flanagan, Larry B. Andrews, Shilo F. University of Lethbridge. Faculty of Arts and Science 2011-07-18T22:21:11Z 2011-07-18T22:21:11Z 2009
dc.description x, 91 leaves : ill. ; 29 cm en_US
dc.description.abstract Douglas-fir (Pseudotsuga menziesii) and lodgepole pine (Pinus contorta) in southwestern Alberta were studied to determine the water sources used and the effect of changing soil moisture on tree ecophysiological function. The hydrogen stable isotope ratios of water from local groundwater and precipitation were compared to tree stem water to determine the amount of stem water coming from those two sources. There were no significant differences between species in the portion of summer precipitation taken up. However, Douglas-fir shifted towards using more groundwater as shallow soil moisture declined. In addition, Douglas-fir showed large changes in shoot water potential, but maintained relatively constant rates of oxygen evolution, whereas lodgepole pine exhibited smaller changes in shoot water potential and had severely reduced rates of oxygen evolution during mid-summer drought. Lower leaf-area to sap-wood area and higher leaf δ13C (carbon isotope composition) suggested a less efficient hydraulic system in Douglas-fir compared to lodgepole pine. en_US
dc.language.iso en_US en_US
dc.publisher Lethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences, c2009 en_US
dc.relation.ispartofseries Thesis (University of Lethbridge. Faculty of Arts and Science) en_US
dc.subject Douglas fir -- Climatic factors -- Alberta, Southwest en_US
dc.subject Douglas fir -- Effect of soil moisture on -- Alberta, Southwest en_US
dc.subject Lodgepole pine -- Climatic factors -- Alberta, Southwest en_US
dc.subject Lodgepole pine -- Effect of soil moisture on -- Alberta, Southwest en_US
dc.subject Climatic changes -- Research -- Alberta, Southwest en_US
dc.subject Upland ecology -- Alberta, Southwest en_US
dc.subject Dissertations, Academic en_US
dc.title Tracing changes in uptake of precipitation and groundwater and associated consequences for physiology of Douglas-fir and lodgepole pine trees in montane forests of SW Alberta en_US
dc.type Thesis en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Biological Sciences en_US Masters

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