植物气孔扩散传导率的研究

本文对生长在可控环境温室中的花生气孔扩散传导率进行了实验研究，揭示了单个植株之间、上下表面之间、叶片不同部位以及冠层垂直方向上气孔扩散传导率的变异性。同时以气孔扩散传导率与环境条件的测定值为基础，对传导率对环境因子的反应进行了分析，植株顶部叶片气孔扩散传导率与太阳总辐射和空气饱和差有关系；冠层传导率与冠层截留辐射和空气饱和差有相关关系。

A Study of Stomatal Behaviour of Groundnut

Observations were made of stomatal behaviour of groundnut growing in glasshouses. Stomatal resistance or its reciprocal, conductance, varies throughout a canopy: between different parts of a leaf, between upper and lower surfaces, between leaves and between plants. The response of stomatal behaviour to environmental factors was analysed. Fig. 4 shows an example of responses of conductance to environmental factors such as air temperature, irradiance and vapour pressure deficit. It is also seen that leaf conductance increases with soil moisture. Under full cover of plants and with wet soil, the following relation between canopy conductance and environmental variables has been found:gc = 0.299 (IR/VPD) - 0.089, (r = 0.94) where gc—canopy conductance (cm/s), IR—intercepted radiation (W/m2), VPD—vapour pressure deficit (mba), r—correlation coefficient.