采用2×2 列联表的Fisher 精确检验、Pearson 相关系数和Spearman 秩相关系数检验研究山西省历山自然保护区猪尾沟森林群落树种种间关系。结果表明：1）秩相关检验的正负相关种对数均高于相关系数检验的种对数，说明秩相关系数比相关系数灵敏度要高。2）物种之间正相关，主要是由于它们对生境具有相似的生态适应性，而物种之间负相关，则主要是由于它们对生境具有不同的生态适应性，种间关系的环境解释很好地验证了这一点。3）依据测定结果，将该区乔木层树种划分为4 个生态种组，生态种组的划分为进一步研究群落的结构、功能、动态、演替提供了重要的理论依据。
Abstract The interspecific relationships of the main tree species in the forest communities were studied using Fisher’s exact test for a 2 × 2 contingency table, Pearson’s correlation coefficient, Spearman’s rank correlation coefficient. 1) The number of species-pairs having positive or negative correlation for Spearman’s rank correlation coefficient test was higher than that of Pearson’s correlation coefficient. Compared with Pearson’s correlation coefficient, Spearman’s rank correlation coefficient test was more sensitive. 2) Similar ecological adaptability to habitats led to positive correlation between species, and different ecological adaptability resulted in negative correlation, which was proved with environmental interpretation of interspecific relationships. 3) Based on the results, 18 tree species in the communities were divided into four ecological groups, serving as an important theory basis for studying forest structure, function, dynamics and succession.