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Title
Environmental control of leaf water conductance in conifers
Document Type
Article
Publication Title
Canadian Journal of Forest Research
Publication Date
1976
Volume
6
Issue
1
First Page
104
Last Page
112
Abstract
Diurnal measurements of leaf conductance, xylem water potential, temperature, humidity, and radiation were taken on six sites throughout Oregon. Xylem water potential was hypothesized to influence leaf conductance in two ways. First, predawn xylem water potential controlled the early-morning maximum leaf conductance of Pseudotsugamenziesii (Mirb.) Franco. Second, irrespective of predawn water potential, a threshold diurnal water potential was found. Whenever water potential of Pseudotsugamenziesii dropped below −20 bars (−20 × 105 Pa) during the day, a significant decrease in leaf conductance resulted. If the water potential threshold was not reached during the day, leaf conductance stayed at the morning maximum or decreased slightly in response to decreasing humidity.
DOI
http://dx.doi.org/10.1139/x76-013
Rights
© 1976 NRC Research Press
Recommended Citation
Running, S.W. Environmental control of leaf water conductance in conifers. Canadian Journal of Forest Research, 1976, 6:104-112, 10.1139/x76-013