不同抚育强度对华北落叶松生长量的影响

为了探求不同密度株数对华北落叶松的影响，通过抚育管理提高华北落叶松年生长量，采用标准地平均生长量对比的方法研究了不同抚育强度对24年生华北落叶松胸径、树高和材积年生长量的影响。结果表明，不同抚育强度对华北落叶松胸径与材积的年生长量有显著影响，随着抚育强度的增大，胸径、材积年生长量逐渐增加，当抚育强度为450株/hm2时，胸径和材积年生长量达到最大值；而抚育强度对其树高无显著影响。

The Effect of Different Tending Thinning Intensity on the Growth of Larix principis-rupprechtii

In order to explore the effects of different density on Larix principis-rupprechtii,the author used the method of standard average growth comparison to study different thinning intensity on the diameter at breast height,tree height and volume year growth of 24 years Larix principis-rupprechtii by tending management to improve the growth of Larix principis-rupprechtii.The results showed that the different thinning intensity on the larch diameter and volume of annual growth had a significant effect,with thinning intensity increased,DBH,volume growth quantity increased gradually,when the thinning intensity was 450/hm 2 when the left and right sides,diameter at breast height and volume of annual growth reached the maximum value;and thinning intensity had no significant effect on the tree height.