Population structure and distribution pattern of Cyclobalanopsis glauca at different topographic sites in Maolan karst forest
Cyclobalanopsis glauca is one of the constructive species and dominant species in subtropical evergreen broad?leaved forest. C. glauca is also the dominant species in karst forest of Maolan National Reserve and plays an important role in the ecosystem. In order to reveal population dynamics of C. glauca,different topography sites(funnel,hillside, valley)in Maolan National Reserve were selected as the objects of research.The population structure was studied by the method of tree class structure instead of age structure,and survival curves of C.glauca was drawn.The distribution pat?terns of the population were measured by applying aggregate indices, including variance/mean ration(deviation index CX),negative binomial parameter(K),clumping index(I),mean crowding index(m?), patchiness index(PAI)and aggregation index(Ca). The population structure and renewal potential of C. glauca in Maolan National Reserve was evaluate. The results showed that ClassⅡsaplings of C. glauca were absolute predominance, the seedlings were the second,and there were some adult individuals,the population had strong self?renewal capacity,characterized by a grow?ing population. The survival curve tended to be type DeeveyⅢ.Among three topography sites,there was complete diam?eter class structure of C. glauca in valley,but the diameter class structures were not complete in hillside and funnel. It showed that the number of seedlings were less than saplings,the number of saplings was the largest,the number of mid?dle and large trees were the least,the diameter structure of C.glauca was high in the middle and low in both ends.The distribution pattern of C. glauca population showed random distribution at different topography sites,and changed from clump to random with the development of the population. It showed that seedlings and saplings were clump distribution, but middle size and large trees were random distribution. The population structure and distribution pattern of C. glauca among three topography sites are different.This study will provide scientific support for C.glauca protection and manage?ment in Maolan karst forest.
国家科技期刊平台
NSTL
万方数据
维普
