疏伐强度对马尾松套种阔叶树林分生长的影响

Effects of Different Thinning Intensities on Stand Transformation of Pinus massoniana Interplanting Broad-leaved

1994年在福建省尤溪国有林场,采用不同强度疏伐(20%疏伐改造、35%疏伐改造、50%疏伐改造,以不改造的林分为对照)后套种细柄阿丁枫的方法,对22年生的马尾松纯林进行改造试验,探讨改造后10 a、20 a林分生长情况。结果表明:马尾松的胸径生长量随疏伐强度的增大而显著增大;细柄阿丁枫的胸径生长量在第1个10 a随疏伐强度的增大而显著增大,在第2个10 a则随疏伐强度的增大而减少。在树高生长量方面,马尾松在第1个10 a随疏伐强度增大逐渐增大,在第2个10 a则是35%疏伐的林分生长量最大(2.88±0.24)m;细柄阿丁枫无论第1个10 a还是第2个10 a均随疏伐强度增大而增大。林分蓄积量也是随着疏伐强度的增大而显著增大。说明高强度的疏伐利于改造后的林分蓄积生长。

Aimed to understand the growth of Pinus massoniana thinning and interplanting Altingia gracilipes. In this paper, by analy- zing the change of stand growth between control stand and improved stand with the thinning intensity of about 20% ,35% ,50% were conducted in 22 year old P. massoniana forest of Youxi forestry farm of Fujian Province. The results showed that whether P. massoniana or A. gracilipes, DBH growth was significantly increased with thinning intensity （ P 〈 0. 05 ）. The DBH amount of growth of P. massoniana increased significantly with the increase of thinning intensity （P 〈0. 05 ）. In the first 10 years ,the DBH a- mount of growth of A. gracilipes was significantly increased with the thinning intensity （P 〈 0. 05 ）, and decreased with the increase of thinning intensity in the second 10 years. The height amount of growth of P. Massoniana was increased with the thinning intensity in the first 10 years. In the second 10 years. The maximum value of the height amount of growth of P. Massoniana was （2. 88 ＋0. 24） m,which appeared in the stand of the 35% intensity thinning in the second 10 years. Whether in the first 10 years or in the second 10 years, the height amount of growth of A. gracilipes was increased with thinning intensity. Stand volume increased significantly with the increase of thinning intensity（P 〈 0. 05 ）. These results implicated that high intensity thinning was beneficial to the growth of transformed stand.