福建三明莘口青钩栲种群结构和空间分布格局动态初步研究

在福建三明莘口格氏栲自然保护区设置１６００ｍ＾２样地５个，应用相邻格子法进行每木调查获取野外资料，通过对青钩栲种群结构和空间格局动态分析，结果表明：福建三明莘口格氏栲自然保护区青钩栲种群结构呈中部缢缩两端大的形状，幼苗贮备十分丰富，约３５２３株／ｈｍ＾２，大树较多，约１４５株／ｈｍ＾２，但小树和中树株数明显偏少，合计约７３株／ｈｍ＾２，这种现象经１０余年发育变化不大。种群结构片断化明显出现于演替到

PRELIMINARY STUDY ON THE STRUCTURE AND SPATIAL PATTERN DYNAMICS OF CASTANOPSIS KAWAKAMII POPULATION IN XINKOU NATURE RESERVE, SANMING OF FUJIAN

m\ 2 plots were established in Fujian Sanming Nature Reserve of \?stanopsis kawakamii\% for the obtaining of sampling data by tally in the contiguous quadrats. Analysis of the structure and spatial patterns of \?stanopsis kawakamii\% population indicates that the population structure of \?stanopsis kawakamii\% has abundant seedlings, 3523 stems/hm\ 2, and big trees, 145 stems/hm\ 2, but relatively few young trees, 73 stems/hm\ 2, which is similar to that of 1981, and that the fragmentation of population structure is easily found in certain successional communities. Generally speaking, the \?stanopsis kawakamii\% forest has not reached a climatic climax while \?stanopsis kawakamii\% population exhibits recession. Spatial patterns of population varies with different developmental stage, with an overall trend from aggregated to random distribution, for example, \%K\% varies averagely from 1.643 to -5.990. Aggregated pattern is prevalent at different successional stages of communities. Different size of blocks has been found to have an effect on the spatial patterns. As for the endangerment of \?stanopsis kawakamii\%, fragmentation of habitats, barries to population regeneration, decreased population nummber due to human disturbance and unstable community environment due to ecotonal locality are the main causes. Conservational strategies should be focussed on ex situ conservation as well as in situ conservation, reducing human disturbance and enhancing inter\|population genetic exchange.