天台山木荷种群分布格局研究

A Study on Distribution of Schima Superba in Tiantai Mountain

采用相邻格子法取样的数据,应用方差/均值比的t检验法、负二项参数、扩散型指数、Cassie指标、丛生指标、平均拥挤指数和聚块性指数等方法,分析了天台山木荷种群在不同群落中的空间分布格局。结果表明:木荷种群在木荷纯林、常绿阔叶林中呈集群分布,而在针阔混交林中为集群趋向随机分布。其集群强度表现为常绿阔叶林最大,木荷纯林次之,针阔混交林最小。此外,还分大小级对木荷种群的分布格局进行了测定,从幼苗到中树,种群从集群分布到随机分布甚至均匀分布,集群强度逐渐降低,总体上种群呈扩散趋势。

The contiguous grid quadrats have been applied to sampling for field data. V/m ratio test, negative binomialparameter, index of dispersion Cassie' index of clumping and idex of patchiness have been used to analyes thedistribution apttern of Schima superba population in different Plant community. The results show that the Schima superbapopulation is clumping in the Schima superba pure forest and in the evergreen broad-leaved forest, while it is form clumpto possion in the mixed need-lebroad leaved forest. The intensity of the evergreen broad-leaved forest is the highest,and the intensity of Schima superba pure forest is higher than the mixed needle-broad leaved forest. In addition, thedistribution of Schima superba population has been tested according to size class. The results show that from saplings togrown-up trees, the population is in poisson from average, and that the degrees of intensity is decreasing from high tolow. The population is extending in whole.