修枝强度对杉木生长的影响

在杉木林分生长过程中,8年生、14年生、20年生时,对目标树进行三次5种不同强度的修枝,研究修枝对立木生长的影响。结果表明,至30年生时,修枝后树高、胸径、材积均不存在显著差异,FH=0.761,SigH=0.576>0.05,FD=0.772,SigD=0.570>0.05,FV=0.741,SigV=0.587>0.05。以各处理目标株材积增量相对值比较,最佳的修枝处理为8年生、14年生、20年生时分别修至5.5、6.5、7.5m,相对不修枝材积增益6.7%~7.7%;重度修枝对材积生长有负面影响,增益-2.9%^-1.1%。

The effect of pruning intensity on growth of Chinese fir

In the process of the growth of Chinese fir forest,which in 8 year-old,14 year-old,and 20 year-old, there was 3 times pruning of 5 kinds different strength to the target tree to study the effect of pruning for wood growth.The results of variance analysis show that,by the time of 30 year-old,there was no significant difference in tree height, chest diameter and volume after pruning, F H =0.761, Sig H =0.576>0.05, F D =0.772, Sig D =0.570>0.05, F V =0.741, Sig V =0.587>0.05.By comparing the incremental relative values of each treatment target plant,the best pruning treatment for 8 year-old,14 year-old,20 year-old to repair to 5.5 m、6.5 m、7.5 m tree height, respectively,the relative non-pruning wood volume gain 6.7%~7.7%.Severe pruning has a negative effect on the growth of wood volume, and the gain -2.9%^-1.1%.