冀北山地不同密度华北落叶松林生长状况分析

Growth Analysis of Larix principis -rupprechtii Plantation with Different Densities in the Mountainous Area of Northern Hebei Province

为了研究不同密度华北落叶松人工林胸径与树高增长情况,以北沟林场东沟作业区3种密度华北落叶松人工林作为研究对象,利用树木解析的方法对3种林分进行生长分析,从而确定该林龄的林分适宜的密度。结果表明:林分密度越大的,其胸径平均生长量越小;密度越小,其胸径平均生长量越大。不同的林分密度,其树高的平均生长量有一定的差异,3个林分密度树高平均生长量的大小排序为975株hm^-2>750株hm-^2>1200株hm^-2。

In order to study the growth of DBH and height of Larix principis-rupprechtii plantation with different densities,three densities of Larix principis-rupprechtii plantation in Donggou operation area of Beigou Forest Farm were taken as the research object,and the growth analysis of three kinds of stands was conducted by using the analytical wood method,so as to determine the appropriate stand density for the age of the stand.Result shows that the bigger the stand density is,the smaller the average growth of DBH is,the smaller the density of stand is,the larger the average growth of DBH is;the average growth of tree height with different stand density is different;among three stand densities the descending order of size of the average growth is:975 plantshm^-2>750 plantshm^-2>1200 plantshm^-2.