四季竹新造林林分结构演替规律

Stand structure of new Oligostachyum lubricum plantation and its succession

通过对初植密度相同分别于2008年4月、2009年4月营造的四季竹林主要林分结构因子的调查及其变化规律、相互关系的研究,结果表明,随着造林后年限的延长,林分密度、新竹胸径极显著地增大,新竹相对全高极显著地减小,新竹全高、枝下高逐渐增大,新竹相对枝下高逐渐减小,四季竹幼林林分结构向着占据更多环境资源的方向演替。林分密度与造林后年限呈二次多项式关系(Y=4 037.5t2+887.5t+400(Radj2=0.843 8,F=52.32,P<0.000 1)),立竹全高、立竹枝下高分别与立竹胸径呈极显著线性关系(TH=17.751 1D+16.058 4(Radj2=0.586 4,F=374.34,P<0.000 1))和二次多项式关系(BH=0.347 6D2-2.534D+41.861 6(Radj2=0.486 4,F=149.37,P<0.000 1))。

The stand structure of new Oligostachyum lubricum plantations planted in the April 2008 and 2009 and its dynamics were studied.The results showed that the stand density,the diameter at breast height（DBH）,the total height,and the under-branch height of the plantations were significantly increased with the increase of stand ages,while the relative total height and the relative under-branch height decreased significantly.This indicated that the new bamboo plantations were under the succession way to capture and utilize more resources.There was a quadratic relationship between the stand density and the stand ages,Y=4 037.5 t2＋887.5 t＋400（Radj2=0.843 8,F=52.32,P0.000 1）,and the relationship between the total height,the under-branch height and the DBH of stand was presented as the linear equation TH=17.751 1 D＋16.058 4（Radj2=0.586 4,F=374.34,P0.000 1）,and the quadratic polynomial model BH=0.347 6 D2-2.534 D＋41.861 6（Radj2=0.486 4,F=149.37,P0.000 1）respectively.