武夷山天然米槠林优势种群结构与分布格局

The Structure and Distribution Pattern of Dominant Populations in Castanopsis carlesii Community

摘要:

在武夷山国家级自然保护区以米槠、杨梅叶蚊母树、罗浮栲和黄瑞木为优势的群落内,应用相邻格子法设置3600 m²样地获得野外调查资料,进行优势种种群结构和空间格局的研究。结果表明: 1)米槠、杨梅叶蚊母树、罗浮栲和黄瑞木种群结构呈金字塔型。2)在分布格局上,四种优势种群都呈集群分布,但聚集强度不同,K值为0.2661-1.2877；在不同发育阶段米槠种群的空间分布格局都呈集群分布;杨梅叶蚊母树、罗浮栲种群,大树呈随机分布,幼树、中树均为集群分布；黄瑞木种群幼树为集群分布,中树则为随机分布；这种差异与其生物生态学特性及与物种的竞争排斥作用有密切联系。3)不同区组对种群空间分布格局产生影响。

Abstract:

Population structure and spatial distribution pattern were investigated in a 3 600 m plot of forest community dominated by Castanopsis carlesii,C. fabri, Distylium myricoides and Adinandra millettii in Wuyishan State Nature Reserve．Fujian，China．Method ofTally with contiguous grid quadrats was used to analyze field data obtained．The results indicated that the populations ofth e four species had a great amount ofreserve seedlings． Spatial distribution pattern ofthese dominant populations appeared to have clumping distribution，but the clumping intensity showed diferences with K values (negative binomiaI distribution index) from O.2661 to 1.2877 Costanopsis carlesii population at different developmental stages all showed clumping distribution while D myricoides and C. fabri exhibited random distribution for large trees，and clumping distribution for saplings and median trees. As for A dimmdro millettii，population random distribution was shown in median trees,and clumping distribution in saplings． Such differences are due to the biological and ecological characteristics of the species and the competitive exclusion principle Varies plot sizes had also an effect on spatial distribution pattern.