长江源区高寒湿地植物群落主要种群种间关系分析

Interspecific Relationships of Dominant Populations in the Alpine Wetlands in the Source Region of Yangtze River

在样方调查的基础上,采用χ2检验、Pearson相关分析和Spearman秩相关分析方法,研究了长江源区高寒湿地植物群落26个主要物种,共325个种对间关联和相关关系。结果表明,χ2检验有26个种对为正关联(p<0.05),22个种对为负关联(p<0.05);Pearson相关系数检验有37个种对为正相关(p<0.05),15个种对为负相关(p<0.05);Spearman秩相关系数检验有46个种对为正相关(p<0.05),34个种对为负相关(p<0.05)。长江源区高寒湿地植物群落具有相关性(p<0.05)的种对数占总种对数的比例较低,为24.6%,这说明大多数种间关系松散,种对间的独立性较强。χ2检验与Pearson相关系数检验、Spearman秩相关系数检验结果用来刻划种间相关性具有相似之处,但仍存在一定差异;与Pearson相关系数检验相比,Spearman秩相关系数检验更具灵敏性;3种方法结合使用效果更好。26个主要物种可以划分为3个生态种组,各生态种组内的种有相似的资源利用方式和生态要求。

Based on the datasets from sampling plots, the interspecific relationships among 26 main plant species of alpine wetlands in the source region of Yangtze River were studied by using methods of χ2-test, Pearson＇ s correlation and Spearman＇ s rank correlation analysis. The results indicated that there were positive associations for 26 pair-species and negative associations for 22 pair-species by χ2-test, positive correlations for 37 pair-species and no negative correlations for 15 pair-species by Pearson＇ s correlation coefficient, and positive correlations for 46 pair-species and negative correlations for 34 pair-species by Spearman＇ s rank correlation coefficient; the proportion of significant pairs-species was few, which mean most species were independently distributed and not closely related with each other; compared with Pearson＇ s correlation coefficient, Spearman＇ s correlation coefficient was more sensitive and could make up the defect of Pearson＇ s correlation coefficient. It was better to investigate the interspecific correlation by combining χ2-test with Pearson＇ s correlation coefficient and Spearman＇ s rank correlation coefficient; the dominant species were divided into 3 ecological groups and the species in the same ecological groups had the same way of utilizing resources.