桥山林区麻栎群落主要乔木种群的种间联结性

Interspecific association of the main tree populations of the Quercus acutissima community in the Qiaoshan forest area

采用方差比率法(VR),基于2×2联列表的χ2检验、联结系数(AC)、共同出现百分率(PC)和点相关系数Ф,对桥山林区麻栎(Quercus acutissima)群落中重要值前17位的乔木种群进行种间联结测定与分析。结果表明:桥山林区麻栎群落17个主要乔木种群总体表现为不显著负关联,各物种趋于独立,群落整体不稳定;χ2检验结果显示17个主要种136个种对中,正联结占44.85%,负联结占55.15%,绝大多数呈不显著关联,说明群落种间关联较弱,群落处于不稳定演替阶段;联结系数AC与共同出现百分率PC分析结果都表明17个主要种总体上对生境的需求不同,各种对同时出现几率小;点相关系数Ф测定结果显示正联结种对62个,占总对数45.59%,负联结种对74个,占总对数54.41%;根据种群的聚类分析和种间联结测定结果及生态习性,把17个主要种群划分为3个生态种组。

Through adaptation of the variance ratio（ VR） method and the χ^2 test,the association coefficient（ AC）,percentage co-occurrence coefficient（ PC） and point correlation coefficients（ Ф）,which are all based on 2×2 contingency tables,were analyzed for the 17 most important tree populations of the Quercus acutissima community in the Qiaoshan forest area. The results showed no significant negative correlations among these 17 tree populations,as the species tended to be distributed independently and the community was unstable. The χ^2 test results showed that among the 136 species pairs of the 17 dominant populations,44.85% had a positive association and 55.15% had a negative one,and the vast majority of these associations was not significant. This indicated that the association among the tree populations was weak,and the community was in an unstable succession stage. Analysis of the AC and PC results revealed that the 17 main populations had different habitat demands, and the probability of simultaneous emergence of each species pair was small. The Фmeasurement results showed that 62（ 45.59%） species pairs had a positive association and 74（ 54.41%） species pairs had a negative association. Based on the cluster analysis and interspecific association results,the habitats of the 17 main populations were divided into three ecological groups.