摘要
应用2×2列联表的Fisher精确检验,研究了太白红杉群落中44种植物 共946个种对 的种间关系.结果有33个种对正关联,12个种对负关联 P<0.05或P<0.01 .另外,用Pearson积矩相关系数和Spearman秩相关系数检验刻划了种对间的数量变化关系.Pearson相关系数显示有31个种对呈显著正协变,5个种对呈显著负协变;Spearman秩相关系数显示有30个种对呈显著正协变,5个种对呈显著负协变,并分别计算出了其相关系数.研究结果表明,太白红杉群落种间关系较为简单,但草本层物种间连接相对较为复杂,灌木层次之.乔木层中,太白红杉和巴山冷杉呈显著的负协变效应.
Fortyfour plant species in communities of Larix chinensis in Qinling Mountain and their interspecific relationship are studied by using Fishers exact test for a 2×2 contingency table.The positive association coefficients of 33 speciespairs for the exact test are either significant or highly significant and negative association coefficients of 12 other speciespairs are significant or highly significant.In addition,Pearsons correlation coefficient and Spearmans rank correlation coefficient are applied to test for correlation between species.The correlation coefficients are calculated.Pearsons correlation coefficient shows that 31 species pairs are very significant positive covariant and 5 species pairs are very significant negative covariant.Spearmans rank correlation coefficient shows that 30 species pairs are very significant positive covariant and 5 species pairs are very significant negative covariant.The results show that the interspecific relationships of communities of Larix chinensis are simpler,but more abundant in herb layer and less in shrub layer.In arbor layer,Larix chinensis and Abies fargesii obviously show their significant negative covariation.
出处
《西北植物学报》
CAS
CSCD
2003年第6期906-910,共5页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金资助项目 (30070083)
陕西师范大学重点科研项目 (200024 )