摘要
在影响草原植被的诸多自然因子中，水分是决定生境差异的主导因子．研究显示：在草甸草原－典型草原－荒漠草原这一区域尺度上，物种数目及群落的物种多样性指数都逐渐减小；群落尺度上，受局部立地条件和微域环境的影响，多样性指数的变化不同于区域模式，表现出各自的特点．通过巢式样方的物种调查，建立了种－面积关系模型，各群落的物种数目Ｓ与取样面积Ａ之间符合Ｓ＝ｂ０＋ｂ１ｌｏｇＡ对数相关形式，相关系数在０．９以上（Ｐ＜０．００１）．
Among lots of factors that affects steppe vegetation,water is the main factor that determines habitats′ difference.The research results are as follows:The species number and the biodiversity index of communities decrease in the regional scale from wetness to dry through meadow,typical steppe to deserta steppe.In the local scale,the variation of biodiversity index is no consistent with the regional module as the results of local conditions and microsites.According to the species investigation by nested quadrats,there is species areas model between species number and sample areas among different communities,and the model is S=b 0+b 1 log A. The correlation coefficient is above 0.9 totally ( P<0.001).
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
1998年第3期407-413,共7页
Journal of Inner Mongolia University：Natural Science Edition
基金
内蒙古自治区教育厅基金
