缙云山亚热带栲树林优势种群间联结性研究

 本文根据2×2联列表，应用方差分析、X2统计量度量、Ochiai指数、Dice指数和Jaccard指数等系列技术，测定了四川缙云山栲树林的13个优势种群间的联结性。并以半矩阵、全矩阵和星座图等形式表达测定结果。研究表明，缙云山栲树林的种间联结测定使用上述系列技术效果很佳。运用方差分析可揭示出多物种整体间联结性，X2检验表示出各种对联结的显著性程度和性质，Ochiai指数、Dice指数和Jaccard指数标量出种对的联结程度和相伴随出现的机率。同时表明，缙云山栲树林种间联结较复杂，栲树(Castanopsis fargesii)与杜英(Elaeocarpus decipiens )间为极显著正联结，而与大头茶(Gordonia acuminata)间为极显著负联结，与小叶栲(Castanopsis carlesii var.spinulosa)间为显著负联结。表明亲缘关系较近、对环境要求相同、对环境反应相似的种群相伴随出现的机率较大，其联结的性质却不因此而定。

STUDIES ON THE INTERSPECIFIC ASSOCIATION OF DOMINANT SPECIES IN A SUBTROPICAL C ATANOPSIS FARGESII FOREST OF JINYUN MOUNTAIN, CHINA

A series of techniques including the analysis of variance, X2-test, Ochiai, Dice and Jaccard indices were used based upon a 2×2 contingency table to determine the interspecific association of the 13 dominant species in a subtropical Castanopsis fargesii forest in the Jinyun Mountain of China. We expressed the results in the forms of semi-matrix, complete-matrix and constellation figures. Our results indicate that the interspecific association of the dominant species in the subtropical Castanopsis fargesii can be adequately interpreted by using the techniques mentioned above. To be specific, the analysis of variance can be used to explain the overall association of all species; the X2-test can be used to describe the statistical significance and the property of the interspecific association; and the Ochiai, Dice and Jaccard indices can be employed to show to what degree a pair of species is associated. The result shows that the interspecific association is very complicated. The relationship between Castanopsis fargesii and Elaeocarpus decipiens is significantly positive. Castanopsis fargesii is significantly negatively related with Gordonia acuminata or Castanopsis carlesii var. spinulosa. The probability of the presence of a specific accompanying species will be high if all the constituent species in a community are closely evolutionarily related, have similar environmental requirements, and respond to the environmental factors with a similar manner. However, the species association properties can not be determined based on the above analysis.