Relationships Between Species Diversity of Plant Communities and Soil Factors in Alpine-cold Grassland

The plant communities' species diversity of alpine-cold grassland in different elevation gradients was studied.Regression analysis was used to study the relationships between 4 diversity indexes and 14 soil factors.Results indicated that total salt content,HCO-3,Ca2+,available nitrogen,pH,and soil moisture content were correlative to species diversity significantly(P0.05).The relationship among diversity,total salt content,HCO-3,Ca2+,available nitrogen,and soil moisture content was best fitted by binomial model.The relationship between pH and richness index was best fitted by linear model.The relationship among Shannon—Wiener index,the total salt content,Ca2+,and pH was best fitted by binomial model.The relationship between soil moisture content and Shannon—Wiener index was best fitted by linear model.The results showed that diversity did not have a simple negative or positive relationship with the soil factors.