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。
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.
大德方便和尚塔在寺东山腰，贞元十一年(795年)，平面六角形，通高4米，西向辟门。
Dade facilitate the monks in the temple tower east mountain, 11 years Zhenyuan (795), flat hexagonal, and 4 m-high, open the door to the West, Tasha residues bad.
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