Species diversity distribution pattern of alpine grasslands communities along a precipitation gradient across Northern Tibetan Plateau

作者：Jianshuang Wu, Xiaojia Li, Zhenxi Shen, Xianzhou Zhang, Peili Shi, Chengqun Yu, Jingsheng Wang, Zhou YuTing · 发表于：Acta Pratacultural Science · 年份：2012 · 被引用次数：8 · 研究领域：Rangeland Management and Livestock Ecology、Ecology and Vegetation Dynamics Studies、Pasture and Agricultural Systems

Aboveground biomass and community stricture at 40 sites with grazing exclusion were surveyed on a west-east alpine grassland transect along precipitation gradient in Northern Tibetan Plateau to evaluate effect of growing season rainfall on both aboveground biomass and species diversity and to discuss the relationship between aboveground biomass and species diversity indexes.The precipitation pattern significantly affected species richness,Shannon-Wiener diversity and Pielou evenness indexes of the alpine communities in inner Northern Tibetan Plateau and that community structure related closely with primary productivity.All of aboveground biomass,species richness,Shannon-Wiener diversity index and Pielou evenness index exponentially increased with growing season precipitation addition.In the relationship between species richness and aboveground biomass of alpine grasslands,the discriminant coefficient of the hump-shaped model(R2=0.754) was slightly higher than linear regression(R2=0.743),however,species richness monotonically increased with aboveground biomass of alpine grasslands along Northern Tibetan Plateau Transect without any monotonic decreasing interval in the hump-shaped model.Moreover,hump-shaped model in our results indicated that species richness more likely showed a monotonic decreasing with aboveground biomass when it was more than 121.17 g/m2 and to make this humped relationship to be standard.Hump-shaped models described both Shannon-Wiener biodiversity and Pie...