短花针茅群落主要物种种间关系的研究

Study on Interspecific Relationships among Main Species of Stipa breviflora Communities

应用2×2列联表的χ2检验和Spearman秩相关分析方法对短花针茅群落21个主要物种的种间关系进行了分析。结果表明:呈不显著相关的种对多于呈显著和极显著相关的种对,呈正相关和负相关的种对在所有种对中几乎各占一半;短花针茅群落21个主要物种可划分为三个生态种组,即冷蒿组、狭叶锦鸡儿组和短花针茅组;研究物种种间关系时,Spearman秩相关系数检验具有较高的灵敏度。

The relationship between 21 main species of Stipa breviflora communities were studied by using 2 test for the 2 x 2 contingency table and Spearman＇s rank correlation analysis. The results indicated that：The pairs that present no significant correlation were more than pairs that present significant and extremely significant correlation. In all of the species pairs, each of the positive correlation coefficients and negative correlation coefficients were almost hold the half. The 21 main species of Stipa breviflora communities could be divided into three ecological groups, viz. Artemisia frigida group, Caragana stenophylla group and Stipa breviflora group. Spearman＇s rank correlation coefficient test was more sensitive to study relationship between species.