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Abstract

The recently developed technique for determining the water stress of a plant by measuring the pressure necessary to force water back to the cut surface of a severed twig is adaptable to both field and laboratory experiments. We have designed and operated an efficient portable system weighing less than 18 kilograms. Sampling variation within and among Douglas fir trees varies from less than ± 1 atmosphere under low stress conditions to ± 10 atmospheres under high stress conditions. In the measurement of plants of comparable height and similar exposure, the variation is reduced to a minimum. Values in internal water stress of Douglas fir vary from 3 to more than 40 atmospheres. Both duration and magnitude of stress are important ecologically. Pressure-bomb measurements are used to demonstrate a relation between plant distribution and internal water stress.

References

PHILIP, J.R., PLANT WATER RELATIONS - SOME PHYSICAL ASPECTS, ANNUAL REVIEW OF PLANT PHYSIOLOGY 17: 245 (1966).
SCHOLANDER, P.F., SAP PRESSURE IN VASCULAR PLANTS - NEGATIVE HYDROSTATIC PRESSURE CAN BE MEASURED IN PLANTS, SCIENCE 148: 339 (1965).
SLATYER, R.O., INTERNAL WATER RELATIONS OF HIGHER PLANTS, ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY 13: 351 (1962).
SLATYER, R.O., AUSTRALIAN JOURNAL OF BIOLOGICAL SCIENCES 11: 349 (1958).
Slatyer, R. O., The State and Movement of Water in Living Organisms: 113 (1965).
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Science
Volume 155Issue 376710 March 1967
Pages: 1248 - 1254

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Published online: 10 March 1967

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Richard H. Waring
Forest Research Laboratory, Oregon State University, Corvallis
Brian D. Cleary
Forest Research Laboratory, Oregon State University, Corvallis

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Science
Volume 155|Issue 3767
10 March 1967
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Published in print:10 March 1967
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