广东石门台自然保护区山顶矮林优势种群分布格局及动态

Distribution patterns and dynamics of dominant mountaintop elfin forest populations in Shimentai Nature Reserve in Guangdong.

运用方差/均值比率法、χ2检验、负二项参数及聚集强度的一些指数研究了山顶矮林优势种群的分布格局和动态,采用大小级代替年龄级分析,发现疏齿木荷、五列木、红锥、木荷和密花树均呈集群分布,其聚集强度由高到低依次为密花树、疏齿木荷、木荷、红锥和五列木。格局动态分析表明,幼苗至幼树,五列木、木荷、密花树、红锥和疏齿木荷均呈集群分布,密花树种群表现为聚集,而其它种群均呈扩散趋势;五列木、木荷和密花树的大树缺失,五列木和木荷的小树和中树均呈集群分布,密花树的小树呈集群分布,中树呈均匀分布;红锥的小树、中树和大树均呈集群分布,种群呈聚集趋势;而疏齿木荷的小树、中树均呈集群分布,大树呈随机分布。

Employing variance/mean ratio,χ^2 test, negative binomial parameter, and some indices of aggregate intensity, this paper studied the spatial distribution patterns and dynamics of dominant mountain elfin forest populations in Shimentai Nature Reserve in Guangdong. The analysis of size structure in place of age structure showed that the five dominant populations in the Reserve were distributed aggregately, and their aggregation intensity from high to low was Rapanea neriifolia, Schima remotiserrata, S. superba , Castanopsis hystrix, and Pentaphylax euryoides. Dynamic analysis suggested that in the series from seedling to sapling, the distribution patterns of these five dominant populations were of aggregate type. R. neriifolia showed an aggregative trend, while the others showed a scattered one. The big trees of R. neriifolia, S. superba and P. euryoides were missing, the saplings and mid-size trees of S. superba and P. euryoides were aggregative, while the saplings and mid- size trees of R. neriifolia were aggregative and uniformly aggregative. The distribution of C. hystrix saplings, mid-size trees and big trees showed an aggregative trend, while S. remotiserrata was aggregative in sapling and mid-size tree stages but random in big tree stage.