采用典型样地调查法对福建大嵛山岛常绿阔叶林木本植物进行群落调查，采用Levins指数、Shannon-Wiener指数、Pianka指数、Schoener指数对木本植物优势种（重要值大于1.5%）的生态位宽度、生态位重叠、生态位相似性进行分析，并采用方差比率、χ²检验、种间联结系数、Jaccard指数分析联结性特征。结果显示：在福建大嵛山岛常绿阔叶林木本植物中筛选出16个优势种，其中，樟（Camphora officinarum Nees）的重要值和生态位宽度最大。木本植物优势种的120个种对中，Pianka指数和Schoener指数在［0.0，0.5）范围内的种对分别有78和91对，占总种对数的65.0%和75.8%，表明多数种对生态位重叠程度和生态位相似性较低，即优势种分布相对独立，种间关系较稳定。优势种间的方差比率为2.37，统计量为37.89，表明总体联结性为显著正联结。χ²检验结果显示：75个种对呈正联结，41个种对呈负联结，4个种对无联结。联结系数分析结果显示：79个种对呈正联结，42个种对呈负联结。80个种对的Jaccard指数在［0.43,1.00］范围内，表明多数种对的联结性较强。回归分析结果显示：联结系数和Jaccard指数与Pianka指数和Schoener指数均在0.001水平上显著正相关。综上所述，福建大嵛山岛常绿阔叶林木本植物优势种间的生态位重叠程度和生态位相似性较低，多数种对呈正联结，且联结性较强；目前大嵛山岛常绿阔叶林接近群落演替发展的中后期阶段，物种组成和群落结构较为稳定。

  A community investigation was conducted for the woody plants in evergreen broadleaved forest in Dayushan Island of Fujian Province by using the typical plot survey method, the niche breadth, niche overlap, and niche similarity of the dominant species (importance value greater than 1.5%) of woody plants were analyzed by using Levins index, Shannon-Wiener index, Pianka index, and Schoener index, and the associative characteristics were analyzed by using variance ratio, χ² test, interspecific association coefficient, and Jaccard index. The results show that 16 dominant species are screened out from the woody plants in the evergreen broad-leaved forest in Dayushan Island of Fujian Province, among which, Camphora officinarum Nees has the highest importance value and niche breadth. Among the 120  pairs of dominant species of woody plants, there are 78 and 91 species pairs with the Pianka index and Schoener index within the range of ［0.0, 0.5), accounting for 65.0% and 75.8% of the total species pairs respectively, indicating that most species pairs have a low degree of niche overlap and niche similarity, namely the distribution of dominant species is relatively independent, and the interspecies relationship is relatively stable. The variance ratio among the dominant species is 2.37, and the statistic is 37.89, indicating that the overall association is significant positive association. The χ² test result shows that 75 species pairs show positive associations, 41 species pairs show negative associations, and 4 species pairs show no associations. The association coefficient analysis result shows that 79 species pairs show positive associations, and 42 species pairs show negative associations. The Jaccard index of 80 species pairs are within the range of ［0.43, 1.00］, indicating that the associations of most species pairs are relatively strong. The regression analysis result shows that association coefficient and Jaccard index have significant positive correlations with Pianka index and Schoener index at 0.001 level. In conclusion, the niche overlap degree and niche similarity between the dominant species of woody plants in the evergreen broad-leaved forest in Dayushan Island of Fujian Province are relatively low, most species pairs show positive associations, and these associations are relatively strong; the evergreen broad-leaved forest of Dayushan Island is approaching the middle to late stage of community succession at present, with relatively stable species composition and community structure.