Difference of community characteristics and niche of dominant species in different grassland types of alpine meadow
This investigation aimed to explore the plant community characteristics and niche of dominant species in different grassland types (Fords meadow,Kobresia humilis meadow,K.pygmaea meadow,K.tibetica swamp meadow) of alpine meadow.The results showed that the plant community species composition,Shannon-Wiener and Simpson diversity was in the order of Fords meadow ＞ K.humilis meadow ＞ K.pygmaea meadow ＞ K.tibetica swamp meadow.There were obvious discrepancies in the above-ground biomasses of different vegetation (P ＜ 0.05).On the plant functional group levels,sedges biomass was the highest in K.tibetica swamp meadow;grass biomass was the highest in K.humilis meadow;ford and legume biomasses were the highest in Fords meadow.There were significant difference between the niche breadth and niche overlaps of main dominant species in the different vegetation;Elymus nutans showed the largest niche breadth in Fords meadow and K.humilis meadow,but K.pygmaea and K.tibetica was the largest in K.pygmaea meadow and K.tibetica swamp meadow,with high niche overlaps with other plant species.The same plant species showed different niche bread and niche overlap in different vegetation types,with those plant species with large niche breadth exhibiting a high degree of niche overlap.The results showed a high difference in the resource utilization ability or ecological adaptability of the dominant species in the different grassland types of alpine meadow.The mainly factor causing such different plant community composition was the heterogeneity of environmental resources.
alpine meadowniche breadthniche overlapplant community characteristics
NETL
NSTL
万方数据
维普
