【摘要】 应用物种多样性和生态位特征等测定方法，着重对老龄杉木林下天然更新阔叶林进行定量分析的结果表明：该复合群落具有较高物种多样性，Shannon－Wiener多样性指数（H）达4．1642，优势种并不十分突出，其生态优势度（C）仅为0．1271；不同生境物种多样性指数以西北坡较高；影响物种多样性的土壤因子主要是有机质，全氮和A层厚度；黄瑞木、细齿拎木、丝栗椅等6种天然阔叶树为广生态位的物种，生态位宽度指数均在0．8以上；山黄皮、枫香等4种为狭生态位物种；24个天然阔叶树的生态位相似性比例在0．8～1．0之间的有16个树种对．本研究对建立新型的杉木栽培模式和混交林树种配置具有重要的指导意义．更多还原

【Abstract】 By applying quantitative methods. we measured the species diversity indices of the regenerated undergrowth in the Chinese fir plantation. The results show that its Shannan-Wiener diversity index (H) is 4.1641; the ecological dominance is only 0.1271; the diversity index of north-west slope is the highest among different habitats; the major soil factors affecting species diversity are organic material, total nitrogen and the thickness of A-layer soil. Six species of broad-leaved trees, including Adinandra millettii, Evrya loquaina, Castanopsis fargesii and so on. have broad niche species. their breadth index of niche are all more than 0.8; other four species. including Randia cochinchinensis, Liquidambar formosana and so on. have narrow niche. Among the 24 tree species, there are 16 tree species couples whose niche similarity proportions are between 0.8- 1.0. The research will show great significance in constructing new cultivation model of Chinese fir plantation.更多还原