种间联结性是指不同物种在空间分布上的相互关联性,是植物群落重要的数量和结构特征之一(邓贤兰等,2003),是群落形成、维持和演替的基础(王文进等,2007).种间联结能有效量化群落中物种相互作用和物种在环境中的配置情况(周先叶等,2000),对于正确认识群落的结构组成、功能和群落演替动态具有重要意义,能为森林经营、森林植被恢复和生物多样性保护提供理论依据(张金屯等,2003).当前对群落种间关联性的研究主要集中在2方面:有无关联和关联程度.形成种间联结性的因素有很多,国内外研究认为种间联结性与下列4个因素有关:1)相似与不相似的环境需求;2)一个种为另外一个种创造了定居条件或者前者对后者施加了压力;3)2者在资源竞争中互相排斥;4)2者通过物理或化学作用互相影响( Greig-Smith,1983;Kershaw et al.,1985;周先叶等,2000).%Based on the 2×2 contingency tables of species presence/absence data collected from a 42 hm2 permanent plot in the coniferous and board-leaved mixed forest in Jiaohe, the VR analysis, χ2 -test, Pearson correlation coefficient test and Spearman rank correlation coefficient test were used in quantitative analysis of the interspecific correlations of 18 dominant species. The results indicated that there was a significantly positive correlation of overall association in the broad-leaved mixed forest community, but most species were insignificant positive correlation. The result of χ2 -test showed that there was a positive association for 85 species-pairs and a negative association for 65 species-pairs. The Spearman rank correlation coefficient test produced more positive correlation species-pairs than the Pearson correlation coefficient test. The positive associations were presented among overall tree species of the community, which suggested the adaptability of species to similar habitats and the niche overlapped. The interspecific correlations were probably associated with ecological habitats. According to the semi-matrix figure correlation coefficients and the ecological characteristics, the 18 dominant species divided into three ecological species groups.
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