抚育间伐强度对华北落叶松中幼林林分生长的影响

The influence of intensity of thinning and tending on the growth of half-mature and young forest of Larix principis-rupprechtii

以河北省木兰围场国有林场管理局克勒沟林场华北落叶松中幼林为研究对象,通过在林场选择样本区域和对照区域,对不同间伐强度下华北落叶松中幼林林分的生长状况进行分析,得到不同间伐强度下森林生长情况的具体参数,结果表明:通过对保留密度分别为400株/hm2、500株/hm2、600株/hm2、700株/hm2的8块样地和2块对照样地中林分的生长情况进行分析,得出各样地中林分的胸径、冠幅、树高、材积的大小除了树高外,都随着抚育强度的增加而呈现显著递增的趋势;通过与对照地做对比得出,在保留密度为500株/hm2时,材积增长率和蓄积增长率最大,但各样地中林分蓄积量小于对照样地中的蓄积量。

In this paper, based on the administration of Mulanweichang National Forestry Farm about Larix principis-rupprechtii, we chose the sample area and control area in the forest to research the forest growth under different thinning intensity, and obtained the specific parameters of the forest growth under different thinning intensity. The stand growth of 8 plots of sample forest in the density of 400, 500, 600, and 700 plants/hm^2 and 2 plots of CK were analyzed respectively. It was concluded that the stand DBH, crown breadth, tree height, and volume size increased with the increase of intensity of tending, presenting an increasing trend except for tree height; Compared with contrasts, the volume growth rate and the stand volume growth rate were the highest in the density of 500 plants/hm^2 , but the accumulation of the stand volume is obvious higher than that of reference sample.