Species diversity of pasture community at different altitude levels in Qilian Mountains

Abstract

Abstract: According to the occurring frequency and life form of plant species at different altitude levels,this paper studied the changing characteristics of the species α diversity of pasture community at the altitude from 2 500 m to 3 000 m in Qilian Mountains.The results showed that with increasing altitude,the Shannon-Wiener species diversity index increased from 1.432 to 1.832,and the variety of Simpson index was very complicated.An altitude of 2 701～2 800 m was an important turning point for species diversity.In pasture community of Qilian Mountains,the percentage of the poisonous and the less edible species exceeded 50%,and their biomass was more than 60% of the total biomass of the community.The biodiversity showed a degraded trend.

Key words: Species diversity, Biodiversity index, Species richness, Altitude level, Qilian Mountains

CLC Number:

S812

CHANG Xuexiang, ZHAO Wenzhi, ZHAO Aifen. Species diversity of pasture community at different altitude levels in Qilian Mountains[J]. Chinese Journal of Applied Ecology, 2004, (9): 1599-1603.

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