为探究山西省文冠果(Xanthoceras sorbifolia)群落的结构、物种组成及种间关联性,在典型抽样调查的基础上,根据2×2列联表,采用方差比率法、χ²检验、Pearson相关系数及Spearman秩相关系数检验等方法,对山西省文冠果群落的22个优势种、231个种对的种间关联性进行了定量研究。方差分析结果表明,22个优势种的总体种间关联性呈显著负关联,物种之间相对独立。χ²检验结果表明,有78个种对呈正相关,153个种对呈负相关,正负关联比为0.51。Pearson相关系数检验64个种对呈正相关,有167个种对呈负相关,正负关联比为0.38。Spearman秩相关系数检验79个种对呈正相关,有152个种对呈负相关,正负关联比为0.52。绝大多数种对的联结关系未达到显著水平,种对间联结性较弱。根据物种的生态特性,应用TWINSPAN分类和DCA排序方法,把22个优势物种划分为4个生态种组。结果表明,山西省文冠果群落整体结构不稳定,优势物种处于演替变化过程中。

To clarify the species composition and inter-specific association of Xanthoceras sorbifolia communities in Shanxi Province,we carried out a series of typical sampling investigations.Based on the 2×2 contingency table,we used variance ratio(VR),χ ² test,Pearson’s correlation and Spearmen’s rank correlation to analyze the inter-specific association among the 231 species-pairs of the 22 dominant species in X.sorbifolia communities.Variance analysis showed that the whole of inter-specific associations of the 22 dominant species were significant negatively correlated,and the distribution of the species was relatively independent.The χ² test,Pearson’s correlation and Spearmen’s rank correlation analysis among the 231 species-pairs of the 22 dominant species showed that 78,64 and 79 species-pairs were positively correlated,153,167 and 152 species-pairs were negatively correlated,and the positive and negative ratios were 0.51,0.38 and 0.52,respectively.The conclusion showed that there were no significant or only low correlations among the most of 231 species-pairs.According to the ecological characteristics of species,and by using the TWINSPAN and DCA methods,the 22 dominant species were divided into four ecological species groups.The results showed that the plants of X.sorbifolia communities are not very stable and in a stage of succession change.