珙桐群落种间关系的研究

用方差比率法(VR)和在2×2联列表基础上应用Jaccard指数、Dice指数和Pearson相关系数、Spearman秩相关系数对卧龙自然保护区三江珙桐群落种间关系进行了分析,结果表明珙桐群落中主要种群在总体上表现出正关联,群落中种间联结的显著度较低,仅有7对联结显著,珙桐与总状山矾呈显著负联结,与稠李呈极显著负联结。大多数种对间关联程度较低,存在极大排斥性的种对较少,暗示目前珙桐群落处于较成熟阶段。研究种间关系时,种间关联性测定指标结合相关系数分析得出的结果较好,最后对珙桐的保护提出了一些建议。

Studies on the relationship of species in Davidia involucrata community

The relationship of species in Davidia involucrata community in Sanjiang,Wolong Nature Reserve were studied by using veriance ratio(VR)and interspecific Jaccard,interspecific Dice for the 2×2 contigency table and Pearson correlation coefficient,Spearman’s rank correlation coefficient. The results indicated that there was positive correlation among main populations in general in D.involucrata community,but the interspecific association was at little significant level. Only seven pairs of species of interspecific association were significant. Correlation coefficient between D.involucrata and Symplocos botryantha Franch was negative significant,and highly negative significant between D.involucrata and Prunus branchypoda. There was a low association degree between most pairs of species. Meanwhile,few pairs of species were extremely exclusive to each other,which indicated that D.involucrata community was mature in present. Indicators of interspecific association adding to correlation coefficient was an effective method to study the relationship between species. Finally,the article proposed the protective measures for the rare and endangered plants.