半干旱区锦鸡儿群落优势种种间关系

Interspecific relationships of dominant species in Caragana communities in semi-arid regions of China

根据58个样方的调查资料,采用χ～2检验和Spearman秩相关系数研究了中国半干旱地区锦鸡儿群落优势种的种间关系。结果表明:在所有种对中,呈极显著和显著关联的种对数所占比率较低,且大部分种对呈现负关联趋势,表明锦鸡儿群落仍处于动态演替状态,受外界干扰易发生波动甚至退化。根据种间关联和种间相关分析结果,将20个优势种划分为3个生态种组,同一生态种组内,种组成员之间具有较强的正联结,表明其资源利用方式和生态要求相似,有一定的群落依存关系,而不同种组间联结较为松散,表现出明显的地域分布差异。

Based on the investigation data of 58 quadrats, and by using Х^2-test and Spearman rank correlation coefficient, this paper studied the interspecific relationships of dominant species in Caragana communities in semi-arid regions of China. Among all the dominant species pairs, most of them had negative correlations, and only a few had significant correlations, which sugges- ted that the Caragana communities were under dynamic succession, and tended to fluctuation or even degradation by external disturbances. Based on the interspecifie association and correlation analyses, the 20 dominant species were classified into 3 ecological groups. In the same ecological groups, the members all showed stronger positive association, suggesting their inter-dependent relationships with similar resource utilization and ciations between the ecological groups were loose entlatlon ecological demands. On the contrary, the asso- and scattered, showing a distinct regional differentiation.