塔克尔莫乎尔沙漠银沙槐群落主要植物的种间关系

Interspecific relationships of major species in Ammoden-dron argenteum communities of Takeermohuer Desert

关键词:  塔克尔莫乎尔沙漠  银沙槐群落  Fisher精确检验  Pearson相关系数  Spearman秩相关系数

Key words:  Takeermohuer Desert   Ammodendron argenteum communities  Fisher's exact test  Pearson's correlation coefficient  Spearman's rank correlation coefficient

摘要:

根据野外调查的样地数据资料,运用2×2列联表的Fisher精确检验、Pearson相关系数和Spearman秩相关系数检验,并结合DCA排序,分析塔克尔莫乎尔沙漠银沙槐群落主要植物种群之间的种间关系。结果表明:Fisher精确检验有3个种对呈显著正关联,3个种对呈显著负关联; Pearson相关系数检验有1个种对呈显著正相关,12个种对呈显著负相关; Spearman秩相关系数检验,有14个种对存在显著相关,其中负相关13对,占所有种对数的14.29%,正相关1对,占所有种对数的1.1% 。银沙槐群落种间关系相对松散,反映出植物群落随着环境变化其物种组成也发生相应变化,正向着相对稳定独立的无关联方向发展。

Abstract:

Based on the data from the field,the interspecific relationships of the major species in Ammodendron argenteum communities of Takeermohuer Desert were studied by Fisher's exact test for 2×2 contingency table, Pearson's correlation coefficient and Spearman's rank correlation coefficient test,coupled with DCA ordinatio. The results indicated that positive association coefficients of 3 species-pairs and negative association coefficients of 3 species-pairs for the Fisher's exact test were significant. In the Pearson's correlation coefficient test,the number of species-pairs being significantly positive was 1,while the negative was 12. According to Spearman's rank correlation coefficient,14 species-pairs had significant(P<0.05 or P<0.01)correlation,including 13 negative correlation species-pairs and 1 positive correlation species-pairs,accounting for 14.29% and 1.1% respectively in the total 91 species-pairs. The interspecific relationships of A. argenteum communities were incompact,the element of communities would change while the environment condition alter,the A. argenteum communities were evolving into steady and independent phase.