摘要
本文讨论用土壤水的相对偏摩尔自由能((■))描述其能态。通过热力学方法推导!给出土壤水各分势的方程表达式与物理涵义。从分析土壤基模(matrix)吸力对土壤水的作用机理得出的基模势(ψm)方程表达式,说明ψm是在土壤基模一定点位上土壤水的摩尔势能,是体系的强度性质;同时说明表征土壤水分特征曲线的ψm与θw的函数关系,是表示在土壤基模不同点位上的ψm与θw的关系。
This paper deals with the energy state of soil-water expressed by Relative Partial Molar Free-energy of soil-water((■)_w^s).Through the strict thermodynamic eduction,it has given more precise physical definition and eq- uation for the soil-water potential. By analysing the mechanism of the Soil Matrix attraction for soil-water,it has given equation of the Matric Potential(ψm).The equation explains that ψm is the molar potential energy of soil-water on the definite place in Soil Matrix and is the Intensive Property of the soil-water system;at the same time it expresses the function relation between ψm and θw on the Charaterisitic Curve of soil-water,that ψm is the Matric Potential of different place in soil matrix.
