Transpiration as a Function of Soil Temperature and Soil Water Stress | Zendy

Lloyd M. Cox | Zendy; L. Boersma | Zendy

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Transpiration as a Function of Soil Temperature and Soil Water Stress

Author(s) -

Lloyd M. Cox,

L. Boersma

Publication year - 1967

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.42.4.550

Subject(s) - transpiration , environmental science , water potential , soil water , humidity , relative humidity , water stress , water content , air temperature , air humidity , agronomy , soil science , chemistry , photosynthesis , atmospheric sciences , biology , geology , physics , geotechnical engineering , thermodynamics , biochemistry

An apparatus was developed for the measurement of transpiration rates of Trifolium repens. The transpiration rates were measured under controlled conditions of soil water stress and soil temperature. Other environmental parameters such as air temperature, relative humidity, light intensity and air speed were held constant. Diffusive resistances were calculated and stomatal aperture changes were recorded for all treatment combinations. A significant interaction between soil water stress and soil temperature was observed for stomatal closures. Stomatal closure was observed even in the so-called wet range of soil water stress. An increase in mesophyll resistance or incipient drying was observed for several treatment combinations. The mesophyll resistance was shown to increase as soil water stress increased.

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