屏边杉木林分适宜密度变化规律及其应用的研究

A Study on the Suitable Density Changing Patterns and Their2]Application of China Fir Forest Stand in Pinbian

以杉木林分自然稀疏线、立地指数等上层树高线数学模型及参数值，计算杉木不同初始密度、立地指数、林龄（上层树高）生长阶段的林分适宜密度．初始密度、立地指数愈高，其适宜密度愈高，反之，则愈低．这是杉木林分适宜密度的基本变化规律，由此看出，一定立地条件下的适宜密度是随林分生长阶段的不同而变化的一个动态过程，因此，林分适宜密度不是某定值．

This article has calculated China Fir 's different starting and ending density,stand index,suitable tree age(the height of the top layer)density during its growing stage based on the natural thinning line,stand index,the mathematical model and parameter of its isotoplayer line.It can be concluded that the higher the starting and ending density and stand index are,the higher the suitable density will be,and vice versa.This is the fundamental changing rule of China Fir stand ' s suitable density.It can be seen clearly from the above that the suitable stand density under certain forest site conditions,changes along with the different stages of the stand.Therefore,the suitable density of stand is not definite.