湖北宜昌大老岭桦、栎、栗林优势种群的分布格局动态研究

运用方差与平均密度的比值、以Ｌｌｏｙｄ的平均拥挤度为指标、Ｍｏｒｉｓｉｔａ的两个个体落入同一样方的概率与随机分布的比值等多种格局的分析方法，研究了位于湖北宜昌大老岭的桦、栎、栗林演替过程中，优势种群格局的动态过程。结果表明，在植物群落演替过程中的各个时期，无主化是先锋种还是顶级种，都是以群集分布主侵样地，然后向均匀分布格局方向发展。

SUCCESSIONAL TREND OF DISTRIBUTIONAL PATTERN FOR POPULATION IN DALAO RIDGE,YICHANG, HUBEI PROVINCE

Several measures, which included variance/mean ratio, Lloyd test,and Morisita, M test,were used to analyze the trend of pattern over successional pathway at Dalao Ridge,Yichang, western Hubei Province. Results showed that population rarely distributed in poisson pattern at real communities,instead it was commonly from contagious to even pattern as communities developed. After then, pioneer species disappeared,while climax species cycled from contagious to even pattern and kept stable self-regeneration.