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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．
The quantitative analysis of the natural regeneration broad-leaved forest under old Chinese fir (Cunninghamia lanceolata) shows that the species diversity of the complex is higher, and the Shannon-Wiener diversity index (H) is up to 4.1642, the dominant species are not very prominent, and their ecological dominance (C) is only 0.1271. The species diversity indices of different habitats are higher on the northwestern slope; the soil factors affecting species diversity are mainly organic matter, total nitrogen and A layer thickness; Huangrui wood, fine teeth carry wood, Chestnut chair and other natural broad-leaved trees of 6 kinds of broad niche species, niche breadth index above 0.8; Shanhuangpi, Liquidambar 4 kinds of narrow ecology Among the 24 natural broad-leaved trees, there are 16 tree species with niche similarity of 0.8-1.0. This study has important guiding significance for establishing a new type of fir cultivation mode and the configuration of mixed tree species.