缙云山草珊瑚群落植物物种多样性研究

A Study of Plant Species Deversity of Sarcandra Glabra Communities in the Jinyun Mountains

采用双向指示种分析法,将缙云山草珊瑚生存群落分为7个群丛,并论述了各类型的特征.采用样方法统计分析其多样性,应用丰富度指数(R1)、Shannaon-Wiener指数(H′)和均匀度指数(E1)研究7个群丛的植物物种多样性.结果表明:1)群丛植物物种多样性指数的大小受立地生境和人为活动的综合影响,群丛间植物种多样性的变化表明7个群丛对缙云山亚热带季风气候具有相似的适应性;2)依据草珊瑚生存群落物种多样性的大小对7个群丛进行排序后发现立地条件好,人为干扰小的群丛其物种多样性相对较高.3)用H′指数、λ指数和E1指数描述群丛性质时存在较好的一致性,λ指数和H′指数可较好地测度优势种在群丛中作用的大小.

Forty-four plots of Sarcandra glabra communities in the Jinyun Mountains （Mt. Jinyun） were classified into 7 associations by two-way indicator species analysis （TWINSPAN）, and the diversity of species composition of these communities was examined. Their plant species diversity, studied with the help of richness indices （R1）, Simpson＇s indices （λ） Shannaon-Wiener＇s indices （H′） and evenness indices （E1）was shown to vary with habitats and human interferences. The diversity indices showed a mild inclined change, suggesting that these associations were well adapted to the local subtropical seasonal climatic conditions. The species diversity of associations with better stand habitats and fewer human interferences was higher. The indices of H＇, λ and E1 demonstrated a relatively high consistency in the present study and H＇ and λ can be used to measure the role of dominant species in the communities as well.