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Effects of shoot water potential (Ψ) and leaf-to-atmosphere vapor pressure difference (VPD) on gas exchange of jack pine ( Pinus banksiana Lamb.), black spruce ( Picea mariana (Mill.) B.S.P.), and aspen ( Populus tremuloides Michx.) were investigated at the northern edge of the boreal forest in Manitoba, Canada. Laboratory measurements on cut branches showed that net photosynthesis ( A n ) and mesophyll conductance ( g m ) of jack pine and g m of black spruce did not respond to Ψ until a threshold Ψ was reached below which they decreased linearly. Photosynthesis of black spruce decreased slowly with decreasing Ψ above the threshold and declined more rapidly thereafter. The threshold Ψ was lower in black spruce than in jack pine. However, stomatal conductance ( g s ) of black spruce decreased continuously with decreasing Ψ, whereas g s of jack pine showed a threshold response. Mesophyll limitations were primarily responsible for the decline in A n at low Ψ for jack pine and black spruce in the middle of the growing season, but stomatal limitations became more important later in the season. Field measurements on in situ branches on warm sunny days showed that both conifer species maintained Ψ above the corresponding threshold and there was no evidence of Ψ limitation on A n of jack pine, black spruce or aspen. Vapor pressure difference was important in regulating gas exchange in all three species. An empirical model was used to quantify the g s response to VPD. When parameterized with laboratory data for the conifers, the model also fit the corresponding field data. When parameterized with field data, the model showed that stomata of aspen were the most sensitive of the three species to VPD, and stomata of black spruce were the least sensitive. For jack pine and aspen, stomata of foliage in the upper canopy were significantly more sensitive than stomata of foliage in the lower canopy. Vapor pressure difference had a greater impact on A n of aspen than on A n of the conifers as a result of aspen's greater stomatal sensitivity to VPD and greater slope of the relationship between A n and intercellular CO 2 concentration ( C i ). During the 1994 growing season, VPD averaged 1.0 kPa, corresponding to ratios of C i to ambient CO 2 of 0.77, 0.71 and 0.81 for jack pine, black spruce and aspen, respectively. We conclude that increases in VPD at the leaf surface in response to climate change should affect the absolute CO 2 and H 2 O fluxes per unit leaf area of the aspen component of a boreal forest landscape more than those of the conifer component. Key words aspen black spruce jack pine photosynthesis stomatal conductance © 1997 Heron Publishing—Victoria Canada « Previous | Next Article » Table of Contents This Article Tree Physiol (1997) 17 (8-9): 521-535. doi: 10.1093/treephys/17.8-9.521 » Abstract Free Full Text (PDF) Free Classifications Original Article Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Similar articles in PubMed Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by Dang, Q. L. Articles by Collatz, G. J. Search for related content PubMed PubMed citation Articles by Dang, Q. L. Articles by Margolis, H. A. Articles by Coyea, M. R. Articles by Sy, M. Articles by Collatz, G. J. 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Tree Physiology – Oxford University Press
Published: Aug 1, 1997
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