X2 test with 2 2 contingency table and ochiai indices were used to analyze the interspecific association of 12 dominant species of meadow community and 20 dominant species of scrub community and 18 dominant species of tree community . pearson ' s correlation coefficient and spearman ' s rank correlation coefficient were also applied to calculate correlations between species 在该地区植被的优势种的种间关系的研究方面，运用2 2列联表、 x ~ 2检验方法对群落优势种进行总体相关性和种对间的联结性检验，利用共同出现百分率jaccord指数测定种对间的关联度，应用pearson相关系数和spearman秩相关系数刻画种对间的数量变化关系。
