重庆缙云山四川大头茶群落组成结构及其数量特征研究

Study on the Structure and the Quantitative Features Of Gordonia acuminata Communities in Jinyun Mountain, Chongqing

分析了重庆缙云山自然保护区四川大头茶３类群落组成、外貌及结构特征，同时，用丰富度指数．均匀性指数及多样性指数比较分析了其结构的数量特征．结果表明，缙云山四川大头茶林以热带亚热带成分为主．３类群落中，热带成分表现为常绿阔叶林（Ａ）＞纯林（Ｃ）＞针阔混交林（Ｂ）；而温带成分则为Ｂ＞Ｃ＞Ａ．３类群落生活型都以常绿高位芽占优势；叶型谱中，Ａ和Ｃ以中型叶为主，Ｂ以小叶为主．３群落结构都以乔木层、灌木层及草本层为基本层，而物种多样性及均匀性表现为Ａ＞Ｂ＞Ｃ．

The composition, physiognomy and structure features of the three Gordonia acuminata communities in Jinyun Mountain Natural Sanctuary were analysed.Meanwhile,the quantitative characteristics of the communities structure were also analysed with the three indices of richness, evenness and diversity. The results shows as flows: the geographic composition is mainly composed of the tropic and subtropic element in G. acuminata communities in Jinyun Mountain among the three communities ,the tropic and subtropic element shows that evengreen broad-leaved community (A)>pure community (C)>coniferous and broad-leaved mixed community (B); and the temperate composition is that B>C>A. Evergreen phanerophytes. Dominate in the life form spectrum. The mesophyll dominates in leaf-size classes of A and C;and microphyll does in B. The vertical structure layers of the three communities are chiefly composed of tree statum,shrub stratum and herb stratum. The species richness,evenness and diversity in them ordered according to B>C>A.