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Transpiration of Helxine solierolii and the Effect of Drought

J. V. Lake, J. D. Postlethwaite and G. Slack
Journal of Applied Ecology
Vol. 6, No. 2 (Aug., 1969), pp. 277-291
DOI: 10.2307/2401542
Stable URL: http://www.jstor.org/stable/2401542
Page Count: 15
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Transpiration of Helxine solierolii and the Effect of Drought
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Abstract

Two experiments are described in which the influence of withholding irrigation upon transpiration was investigated, using a continuous cover of a herbaceous perennial, Helxine solierolii. The results are interpreted as showing that the resistance to water transport between the near-surface soil layers and the transpiring leaves was negligible when the daily transpiration rate of irrigated plants was in the range 0-4 mm. For plants well supplied with water, the stomatal resistance to water vapour transport was not negligible. Changes in the transpiration rate of plants in drying soil, relative to that of irrigated ones, were attributed to changes in the water vapour conductance of the stomata resulting from changes in soil water potential, these two factors being linearly related over a range of potentials from -1 bar to less than -20 bars. Published data for cotton and saltbush, with daily transpiration rates in the range 0-12 mm, were shown to lead to similar conclusions.

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