豆科根瘤内气体交换和气体扩散模型研究

摘要/Abstract

摘要： 近年来的研究表明根瘤皮层内存在着可调节的气体扩散屏障,它是由根瘤皮层内的一层细胞及填充在胞间隙的水层构成的,而根瘤是通过改变填充该层胞间隙的水层厚度来调节对气体扩散的阻力。本文概述了关于模拟豆科根瘤内气体交换和气体扩散的数学模型研究,阐明调节根瘤内含类菌体细胞维持低氧分压的有关问题。模型研究使我们获得了对共生固氮根瘤内极为复杂的微生态环境的初步认识,有待于通过改进试验和借助其他理论进一步探索根瘤气体交换和气体扩散的本质。

关键词: 豆科根瘤, 气体交换, 扩散屏障, Fick定律, 胞间隙

Abstract: Amodel is introduced to simulate the gas exchange and dirrusion in legume nodules with the aim of elucidating some aspects of regulating low O₂ concentration in the infected cells of nodules. Both of Layzell-Hunt and Bergersen-Sheehy Models suggested that the diffusion barrier is aqueous and may ccnsist of a layer cf cells in the nodule cortex,in which,the intercellular spaces are filled with water. The resistance of such a barrier could be regulated by altering the depth of water occupying the intercellular spaces. The advantage of the model is an inherent flexibility,so that having obtained a first approximation to this extreme complex symbiotie association,and evaluated this approximation in the light of empirical or theoretical consideration. The model should be modified in lectifying in its assumption.

Key words: Legume nodule, Gas exchange, Diffusion barrier, Fick's1st and2nd laws, Intercellular spaces

蔺继尚, 王书锦, 胡济生. 豆科根瘤内气体交换和气体扩散模型研究[J]. 应用生态学报, 1990, 1(4): 364-372.

Lin Jishang, Wang Shujin, Hu Jisheng. Model study on gas exchange and diffusion in legume nodules[J]. Chinese Journal of Applied Ecology, 1990, 1(4): 364-372.

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