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Field Measurements of Photosynthesis, Stomatal Conductance, Leaf Nitrogen and δ13C Along Altitudinal Gradients in Scotland

A. D. Friend, F. I. Woodward and V. R. Switsur
Functional Ecology
Vol. 3, No. 1 (1989), pp. 117-122
DOI: 10.2307/2389682
Stable URL: http://www.jstor.org/stable/2389682
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Field Measurements of Photosynthesis, Stomatal Conductance, Leaf Nitrogen and δ13C Along Altitudinal Gradients in Scotland
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Abstract

Field measurements were made of altitudinal variation in photosynthesis and stomatal conductance in Vaccinium myrtillus L. and Nardus stricta L., between 200 and 1100m in central Scotland during July 1986 and June 1987. Under saturating irradiance and similar vapour pressure deficits (0.9-1.2 kPa) both species showed either constant or increasing rates of photosynthesis and increasing stomatal conductance and leaf nitrogen per unit leaf area with altitude. Leaf δ13C values for both Nardus and Vaccinium increased (though not significantly) with altitude in 1986 but decreased in 1987. It is suggested that the change in slope between years is related to marked differences in annual climate. The short-term measurements of gas exchange were better predictors of δ13C in 1986 than in 1987.

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