叶片内水传输的模拟

根据水在介质中的流动规律和能量守恒原理,在植物叶片内建立了一个稳态的水传输模型。该模型考虑了气孔复合体内外、共质体与质外体、原生质与细胞壁在水传输上的不同,应用计算机详细地分析和计算了叶内(特别是气孔复合体内)水的传输,得到水势在叶片内近似分布的关系式。应用这些关系式对叶内的水势和水势差作了估计,并对不同解剖特征叶片内的水势差作了比较。

The Simulation of Water Transport in Leaf

A detailed steady state model describingwater transport in leaf has been developed.In this model, different treatments were adop-ted for the tissue outside and those withinthe stomatal complex. In the latter case,each cell was divided into seven compart-ments or units (one protoplast compartmentand six cell wall compartments). Based onthe law of water transport in liquid mediumand the principle of conservation of mass,a series of equations were set up to describethe water transport through the compart-ments in the stomatal complex and other cellsor tissues in leaf.The computer program ofthe model was run on a Burroughs ComputerB6900. The formulas of the water potentialand the resistances to water transport in thecompartments in the stomatal complex andother tissue in leaf were derived and usedto calculate the water potential and differencesof it in stomatal complex cells, epidermistissues and other tissues in the leaf.Theeffect of guard cell volume, the thickness ofcell wall in the stomatal complex and the linksbetween stomatal complex cells and mcsophyllon the parameters in the formulas mentionedabove was calculated. It is shown that theinfluence of changes of guard cell volume dur-ing water transport in leaf on the parametersis negligible, but that of anatomical charac-teristics of the. stomatal complex cells on theresistances to water transport in the tissues orthe distribution of water potential in it is ob-vious. The formulas obtained in the paper canbe used to study the behavior of stomata andthe water transport in plant and water balancebetween it and environment.