缙云山常绿阔叶林优势乔木树种间协变研究

采用Pearson积矩系数、Spearman秩相关系数和方差分析.对缙云山常绿阔叶林14个优势乔木树种间的协变进行了研究,并以星座图表达测定结果.研究结果表明,种间协变不仅能够反映出物种间共存的机率,而且能够反映出其相对数量变化的趋势和程度.运用方差分析可揭示多物种间协变的性质和显著性,Pearson积矩系数和Spearman秩相关系数能表明种对间协变的性质和显著程度.结果表明,缙云山常绿阔叶林优势乔木树种间协变较复杂,其中栲树与光叶灰木、润楠间表现出极显著的正协变,而与大头茶、银木荷、虎皮楠间存在极显著的负协变,对环境要求相同的种,其联结性高,但因相互竞争而协变为负,在实际运应时,Spearman秩相关指数相对较精确.

STUDIES ON THE INTERSPECIFIC COVARIATION OF THE 14 DOMINANT SPECIES IN THE EVERGREEN BRODLEAVED FOREST OF MOUNTAIN JINYUN

With the help of the Pearson product-moment correlation coefficient and the Spearman rank correlation coefficient as well as the analysis of variance, the interspecific covariation of the 14 dominant species in the subtropical evergreen broadleaved forest of Mt. Jinyun is analyzed and the results are expressed in the form of constellation figures. It reveals that the interspecific covariation can not only display the probability of species coexistence but also indicate the direction and extent to which the quantity of species changed. The result shows that the interspecific covariation is sophistcated , the covariations between Ca&lanopsis fargesii vs. Syiitplocos landfolia and MacMus pmgu are extremely positive, while that between Caslajuipsm fargesit vs. Gardunia at-unattata, Scluitia argeitifa and Daplmiphyllum ghuceacens are extremely negative. It should be noted that the high interspecific association does not mean the remarkably positive covariation. The species that have very similar demands for habitats have high association, but their covariation is negative because of competition. The Spearman rank correlation coefficient can indicate the interspecific covariation accurately than Pearson product-moment correlation coefficient.