Comments on the psychrometric determination of leaf water potentialsin situ |
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Authors: | P. E. Zanstra F. Hagenzieker |
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Affiliation: | (1) Centre of Biology, University of Groningen, Haren (Gr.), The Netherlands |
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Abstract: | Summary Leaf diffusion resistances may lower the values of leaf water potentials found byin situ measurements with silver-foil psychrometers. With the instrumentation used, the bias ranges from zero to increasing negative deviations as leaf diffusion resistances become larger than 3.5 cm-1 sec.Water potentials determined with the dewpoint technique are unaffected by diffusion resistances.In situ measurements by this method may also be carried out with the silver-foil sensor.Hence, one and the same sensor may serve to trace both leaf water potentials and leaf diffusion resistance through dewpoint and psychrometric measurements. re]19760720 |
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