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以由能量平衡原理及边界层水汽扩散理论而导出的Ｐｅｎｍａｎ－Ｍｏｎｔｅｉｔｈ公式为基础，确立了棵间潜在蒸发及潜在植株蒸腾的计算模式．建立了以作物根量分布为基础的根系吸水模型．结合实测资料，导出了棵间实际蒸发的经验模式．应用上述经验与半经验模型，结合非饱和土壤水份运移方程，对田间土壤水份动态进行了模拟与预测，其结果与实测结果拟合较好．
Based on the Penman-Monteith formula derived from the theory of energy balance and the diffusion theory of boundary layer water vapor, the calculation model of latent evaporation and potential plant transpiration was established. A root water absorption model based on the distribution of crop root volume was established. Combined with the measured data, the empirical model of actual evaporation between trees was derived. Based on the above empirical and semi-empirical models, combined with the unsaturated soil moisture transport equation, the dynamic of soil moisture in the field was simulated and predicted. The result was in good agreement with the measured data.