Parabolic curve function, power function, Richards equation and single molecular equation, related tree height to diameter at breast height and widely used in forest gap model, were analysed.
为了更准确地描述树高与直径的关系，文章综合分析了广泛应用于林窗模型中的四个数学方程，即二次曲线、幂函数方程、理查德方程和单分子方程。
Based on the mixed-form of the Richards equation and a finite difference scheme, a VBA program is developed to perform the numerical simulation of the saturated-unsaturated flow drainage experiment.
基于混合形式的Richards方程以及一种质量守恒的有限差分格式，编写了一个VBA程序以对饱和-非饱和流排水实验进行数值模拟。
Based on the mixed-form of the Richards equation and a finite difference scheme, a VBA program is developed to perform the numerical simulation of the saturated-unsaturated flow drainage experiment.
基于混合形式的Richards方程以及一种质量守恒的有限差分格式，编写了一个VBA程序以对饱和-非饱和流排水实验进行数值模拟。
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