浙江宁海钩栲群落结构及更新类型

Community Structure and Regeneration Types of Castanopsis tibetanain Ninghai,Zhejiang Provice

栲属植物是我国东部常绿阔叶林的主要组成树种。在进行宁波市森林资源调查中发现宁海南溪村有钩栲(Castanopsis tibetana)天然分布,采用标准样地法进行群落学调查,分析了钩栲群落结构及其主要组成树种的更新类型。结果表明:钩栲是群落最大优势种,林木层中出现木本植物23科45种;5种种群结构类型:单峰型、单柱型、间歇型、L字型和逆J字型。逆J字型的钩栲和甜槠(C.eyrei)通过幼苗和萌枝2种更新方式维持其在群落中的优势地位。群落已进入常绿阔叶林演替阶段,但还处于前期。由于地理位置和群落结构的差异,现有钩栲群落种类组成存在差异。

Castanopsis is the main tree species of evergreen broadleaved forest （BEF） in east China. In Nanxi village,northwest of Ninghai,the natural distribution of Castanopsis tibetana was found during forest re- source survey. To determine the structure and regeneration types of the main species of C. tibetana commu- nity,all wood species within standard sampling plots were identified and measured. The results indicated that C. tibetana was the dominant species in the community. Forty-five species of plants,belonging to 23 families,were recorded in the wood layer. The regeneration of woody species was categorized into five types： unimodal, unibar, sporadic, L and inverse-J types. C. tibetana and C. eyrei were within the category of inverse-J type, which regenerated through new stems and sprouts, and were long-lived dominant wood species in the community. The succession stage of this forest was classified as late seral community stage which would develop into a climax community. For the geographical location and community structure,the species composition was different between this C. tibetana community and others.