过刊浏览

对一个气孔经验模型的电学类比分析和模拟检验

傅伟, 王天铎

中科院植物生理研究所.上海 200032

摘要

对Ball等人提出的气孔经验模型进行了分析和模拟检验,分析是通过电学类比实现的,在引进叶片边界层导度很大等假设后可以从气孔内外CO_(2)浓度之比保持恒定的实验事实推导出这个经验模型的表达式;在其它类似的实验事实的基础上已可作同样的推导。模拟检验中采用的是由作者建立的、较为完整的气孔对环境响应的机理性定态数学模型。两种方法得出的结论是一致的:Ball等人的经验模型有一定的局限性,因为它不能模拟边界层阻力和叶温对气孔导度的影响。由此我们指出叶片表面的风速是影响气孔导度的重要环境因子之一。一个完整的气孔模型必须包括它的影响。

关键词： 气孔; 气孔导度; 边界层导度; 数学模型; 电学类比; 光合作用

The electrical analogy analysis and simmulation testing of a stomatal empirical model

Fu Wei, Wang Tianduo

Shanghai Institute of Plant Physiology,The Chinese Acakemy of Sciences. Shanghai 200032

Abstract

The empirical model of stomatal responses proposed by Ball et al.has been tested by analysis and simulation.A mechanistic model of stomatal conductance developed by the authors was adopted to test the empircal model.The two approaches have led to the same conclusions:(1) the radiation flux or ambient CO_(2) concentration should not be too small as has been pointed out by some authors;(2)the boundary layer resistance of leaf had significant influence on the results of regression i.e.,when the data measured with different boundary layer resistances were fitted by linear regression,(3)the model did not simulate the influence of leaf temperature successfully, and hence can be used only at fixed leaf temperatures;and(4)the influence of soil water potential was not significant.From the second point,it is concluded that wind speed over the leaf surface plays an important role in regulating stomatal movement and that a comprehensive model of stomatal behaviors must incorporate wind speed over the leaf surface.

Key words: Stomata;Stomatal conductance;Boundary layer conductance;Mathematical model;Electrical analogy;Photosynthesis

收稿日期：　　录用日期：

通讯作者：　　E-mail:

引用本文：

傅伟, 王天铎. 对一个气孔经验模型的电学类比分析和模拟检验[J]. 生理学报 1996; 48 (2): .

Fu Wei, Wang Tianduo. The electrical analogy analysis and simmulation testing of a stomatal empirical model. Acta Physiol Sin 1996; 48 (2): (in Chinese with English abstract).