塔克尔莫乎尔沙漠银沙槐群落主要植物的种间关系

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。

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

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.