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《植物学报(英文版)》 1989-01
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Yang Shu-dong Wang Tian-duo (Shanghai Institute of Plant Physiology,Academia Sinica)  
In this paper stomatal pore and substomatal cavity are considered to be elliptie cylinders. A three-dimensional diffusion model is presented,which describes the diffusion of vapour from the surfaces of the cells surrounding the cavity to the cuter end of the pore.Equations describing vapour diffusion in the model are set up,based on Fick's law and the law of con- servation of mass,and are solved by using computer.Quantitative relation between the cavity resistance to water vapour diffusion and stomatal aperture is obtained and is given more general theoretical explanation.Comparing the formula obtained in this paper with those Of Brown and Escombe and of Cooke et al.,it is found that the cavity resistance calculated by the latter two formulas are 0.5—1 times higher in a large range of stomatal aperture values.Besides,it is shown by calculating that the rates of loss from guard cells and subsidiary cells account for 88— 93% and 7—12% respectively of that from epidermic cells,and the Ltter amounts to 86—96% of that from all the cells in the cavity in the large range of stomatal change.
【Fund】: 中国科学院科学基金资助的课题
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1 YANG Shu-Dong;WANG Tian-Duo Shanghai Institute of Plant Physiology, Academia Sinica, Shanghai 200032;A Refined Calculation of the Boundary Layer Resistance Outside the Leaf Stomata[J];;1988-01
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