摘要
在福建三明莘口格氏栲自然保护区设置 1 6 0 0m2 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1) 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 35 2 3株 /hm2 ,大树较多 ,约 1 4 5株 /hm2 ,但小树和中树株数明显偏少 ,合计约 73株 /hm2 ,这种现象经 1 0余年发育变化不大。种群结构片断化明显出现于演替到一定程度的群落中。总体而言 ,保护区内青钩栲林尚未演替至气候顶极群落 ,但青钩栲种群已表现出衰退现象。不同发育阶段种群空间分布格局有差异 ,总体趋势由集群向随机分布转变 ,由聚集度高向聚集度低转变 ,例如 ,在 5个样地中 ,除样地 1缺少大树外 ,由Ⅰ级幼苗向大树发育过程中 ,平均K值变化由 1 6 43降至- 5 990。不同演替群落中种群空间分布格局总体上仍是集群分布。不同区组大小对空间分布格局产生影响。青钩栲种群濒危原因包括分布区局限使生境破碎 ,种群更新障碍使种群结构缢缩 ,人为干扰使种群数目减少和地处交错带使群落不稳定等原因。以迁地保护为主 ,加强就地保护研究工作 ,减少人为干扰 。
m\+2 plots were established in Fujian Sanming Nature Reserve of \%Castanopsis kawakamii\% for the obtaining of sampling data by tally in the contiguous quadrats. Analysis of the structure and spatial patterns of \%Castanopsis kawakamii\% population indicates that the population structure of \%Castanopsis 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 \%Castanopsis kawakamii\% forest has not reached a climatic climax while \%Castanopsis 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 \%Castanopsis 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.
出处
《林业科学》
CAS
CSCD
北大核心
2000年第3期27-32,共6页
Scientia Silvae Sinicae
基金
GEF中国自然保护区管理项目小型科研鼓励基金
关键词
青钩栲
种群结构
空间分布格局
种群生态
Castanopsis kawakamii\%, Population structure, Spatial pattern, Dynamics
