南岭山地天然杉木林树种组成及主要种群间联结性研究

Species Composition and Interspecific Association of Dominant Species of Cunninghamia lanceolata Natural Forests in Nanling Mountain Region

采用重要值方法分析判别各物种在群落中的地位和作用,根据2×2联列表、综合应用方差、IO指数、X2统计量检验等方法,测度了九连山自然保护区天然杉木林乔木层中30个主要树种的总体联结关系、种间联结系数及其X2值。结果表明:天然杉木林乔木层树种间总体上呈不显著的无相关性;从435种对看,共有187对正联结,135对负联结,113对完全独立,其中9对显著正联结,1对显著负联结,2对显著独立分布。这说明九连山保护区天然杉木林群落仍处在尚未稳定的杉阔混交林阶段。

The status and function of these species in the community were analyzed and discriminated by Important Value （Ⅳ）, and the overall association relationship, interspecific coefficient and χ^2 value of 30 major woody species in the arborous layer in Cunninghamia lanceolata natural forests of Jiulianshan Nature Reserve were analyzed by a series of approaches including 2×2 contingency table, comprehensive application of variance analysis, association coefficient（IO）, χ^2- test. The results showed there was not significant correlation among trees species in the arborous layer in C. lanceolata natural forests on the whole. Therer are 435 species pairs in all, the positive association coefficients of 9 species pairs from 187 species pairs are either significant or highly significant, and the negative association coefficients of 1 species pairs from 135 species pairs are significant or highly significant, the full independence of 2 species pairs from 113 species pairs are significant or highly significant. The community of C. lanceolata natural forests in Jiulianshan Nature Reserve are still in the no-stable stage of mixed forest of fir and broad-leaves trees.