北京地区刺五加(Acanthopanax senticosus)群落优势种种间关联性分析

Interspecific Association among Dominant Species in Acanthopanax senticosus Communities in Beijing,China

为了探讨北京地区刺五加(Acanthopanax senticosus)群落的物种组成、群落结构和种间关联性,在典型抽样法调查的基础上,基于2×2列联表,采用方差比率法、χ2检验、Pearson相关系数和Spearman秩相关系数检验等数量分析方法,对北京百花山和雾灵山自然保护区刺五加群落中的27个优势物种、351个种对间的种间关联性进行了研究。结果显示,刺五加群落中27个优势物种总体呈极显著正关联,表明该群落处于相对稳定的演替阶段;χ2检验表明,正关联种对有191对,负关联种对有160对,正、负关联种对比值为1.19;Pearson相关检验发现,正关联的种对有112对,负关联的种对有239对,正、负关联种对比值为0.47;Spearman秩相关检验结果显示,正关联的种对有170对,负关联的种对有181对,正、负关联种对比值为0.94。将优势物种对环境的适应方式和主导生态因素相结合进行PCA排序发现,27个优势物种可被划分为4个生态种组。本研究结果表明北京地区刺五加群落物种组成相对稳定且群落结构正处于发展阶段。

To clarify the species composition and interspecific association of Acanthopanax senticosus communities in Beijing,we carried out a series of typical sampling investigations.Based on the 2 × 2 contingency table,we used variance ratio（VR）,χ2-test,Pearson＇s correlation and Spearman＇s rank correlation to analyze the interspecific association among 27 dominant species in A.senticosus communities.Results showed that 27 dominant species were significantly positively correlated,indicating a relatively stable succession status in the communities.Theχ2-test,Pearson＇s correlation and Spearman＇s rank correlation analyses among the 351 species-pairs of the 27 dominant species showed that 191,112 and170 species-pairs were positively correlated,160,239 and 181 species-pairs were negatively correlated,and the positive and negative ratios were 1.19,0.47 and 0.94,respectively.According to the species adaptations to the environment and the leading ecological factors,in combination with principal components analysis,the 27 dominant species were divided into four ecological species groups.The results showed high interspecific association among the A.senticosus communities.The communities also showed relative stability in species composition and development of community structure.