川西亚高山针叶林林窗边界木特征的研究

为探讨川西亚高山针叶林边界木树冠对林窗干扰的响应,对王朗自然保护区的这一植被类型进行了调查,分析了该类型森林中边界木的数量、树高、胸径和偏冠率的分布。结果表明：一些林窗的个别边界木个体较小,但大多数边界木个体与群落乔木层中主要树木的个体大小相一致,一个林窗中边界木的平均高度可以用来表示林窗的高度;约1／5的边界木未出现偏冠现象,绝大多数边界木的偏冠率在0．5～0．7之间(占61．72％),不同树种间的偏冠有显著差异;单个林窗的边界木最少为5株,最多为17株,平均每个林窗拥有9．51株边界木。

Studies on the Characteristics of Gap Border Trees in the Subalpine Coniferous Forest in Western Sichuan

In order to explore the responses of gap border trees(GBT)to gap disturbance in subalpine primary conifer forests in the western Sichuan Province,the GBTs in the typical primary conifer forest at Dawodang within Wanglang Nature Reserve were surveyed and analyzed according to species, height, diameter at breast height (DBH), crow inclination and so on. The results showed that the size of GBTs accorded well with the one of the canopy trees in general stand while a few were smaller;it's feasible to regard the averaging heights of GBTs as the heights of their gaps;the ratio of crow inclination (RCI) of most GBTs were in the range of 0.5 and 0.7 while about 1/5 GBTs' crows were regular, and the RCIs difference of species were significant; the maximum number of GBTs in one gap was 17 while the minimum was 5, and averaging 9.51 GBTs per gap.