山西五鹿山自然保护区木贼麻黄群落优势种的种间关联性分析

Interspecific Association Analysis of Dominant Species in Ephedra equisetina Communities in Wulu Mountain Nature Reserve,Shanxi Province of China

为了探讨山西五鹿山自然保护区木贼麻黄群落的物种组成、群落结构和种间关联性,该研究基于2×2联列表,采用方差比率法、χ2检验、Pearson相关系数及Spearman秩相关系数检验等数量分析方法,对山西五鹿山自然保护区木贼麻黄群落中25个优势种、300个种对间进行了种间关联性分析。结果显示:(1)木贼麻黄群落优势种群间总体上呈正关联,表明该群落处于稳定的演替阶段。(2)χ2检验结果表明,正关联种对数有141对,负关联种对数有132对,正负关联比为1.07;Pearson相关系数检验中,正关联种对数有128对,负关联种对数有151对,正负关联比为0.85;Spearman秩相关系数检验中,正关联种对数有129对,负关联种对数有134对,正负关联比为0.96。(3)根据研究区25个优势种群对环境的适应方式和主导生态因素并结合PCA排序,可将25个优势种群划分为4个生态种组。研究表明,山西五鹿山自然保护区木贼麻黄群落物种组成相对稳定且群落结构处于发展阶段。

To clarity the species composition and interspecific association of Ephedra equisetinacommunities in Wulu Mountain Nature Reserve,we carried out a series of typical sampling investigations.Based on the2×2contingency table,we used variance ratio（VR）,χ2-test,Pearson＇s correlation and Spearman＇s rank correlation to analyze the interspecific association among 25 dominant species in Ephedra equisetina communities.Results showed that：（1）25dominant species were significantly positively correlated,indicating a relatively stable succession status in the communities.（2）Theχ2-test,Pearson＇s correlation and Spearman＇s rank correlation analyses among the 300species-pairs of the 25 dominant species showed that141,128 and 129species-pairs were positively correlated,132,151 and 134species-pairs were negatively correlated,and the positive and negative ratios were 1.07,0.85 and 0.96,respectively.（3）According to the species adaptations to the environment and the leading ecological factors,in combination with principal components analysis,the 25 dominant species were divided into four ecological species groups.The resultshowed high interspecific association among the E.equisetinacommunities.The communities also showed relative stability in species composition and development of community structure.