Spatial differentiation of grassland vegetation and species diversity in Qinghai Lake basin
[Objective]To reveal the spatial differentiation of grassland vegetation and species diversity in Qing-hai Lake Basin.[Method]The Patrick richness index,Shannon-wiener diversity index,Pielou evenness index and Simpson dominance index were used to analyze the species diversity and importance values of the grassland based on field survey and remote sensing.[Result]1) Grasses,Compositae and sedges were dominant in the grassland of Qin-ghai Lake Basin. The dominant species in warm steppe are mainly Achnatherum splendens,Stipa breviflorum and Stipa Splendens.. In the middle altitude alpine grassland,the dominant species of the grassland were grass,artemisia frigida and Stipa purple.The alpine meadow was mainly composed of kobresia,kobresia alba,Kobresia alba,Kobresia borealis and Kobresia alba.2) In the low coverage area,Stipa purple and Kobresia boreal were the dominant species,which had the characteristics of cold tolerance,salt and alkali tolerance.In the middle coverage area,the dominant spe-cies were kobresiaaltifolia,Kobresiaaltifolia and Kobresiaaltifolia. In the high coverage area,the dominant species of Achnatherum Splendens,Stipa clari and Fescue purple were mainly found,and the hierarchy of community structure was obvious. 3) In different coverage regions,richness index,diversity index and evenness index showed low cover-age (VFC＜0.3),medium coverage (VFC0.3～0.6) and high coverage (VFC＞0.6),while dominance index showed opposite trend.4)The richness index and diversity index of different grassland types formed a unimodal curve of "low,high and low",which was higher in the alpine grassland area,ranging from(0.659～2.897)and(5～26),re-spectively.The evenness index of alpine meadow was higher (0.146～0.919).[Conclusion]The results showed that the coverage had little effect on grassland species diversity,and the grassland species diversity of different grassland types was mainly affected by altitude. Therefore,altitude was the main factor affecting the grassland vegetation and species diversity in Qinghai Lake Basin.
species diversityspatial differentiationvegetation communitiesQinghai Lake basin
万方数据
维普
