祁连山区不同海拔草地群落的物种多样性

摘要/Abstract

摘要： 依据植物在各海拔带出现的频率和不同海拔带植物种的生活型,对祁连山区草地群落海拔25 00～3000 m的物种α多样性变化特征进行了研究.结果表明,随海拔升高,Shannon-Wiener指数从1.432上升到1.832,Smpson指数的变化较为复杂.海拔2 701～2 800 m带是物种多样性的一个重要转折点,是物种多样性较丰富的地带.在祁连山草地群落中,有毒的与食性较差的物种在各海拔带所占比例均超过50%,生物量占到整个样地生物量的60%以上,物种多样性已呈现衰退.

关键词: 物种多样性, 物种多样性指数, 物种丰富度, 海拔带, 祁连山区

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

中图分类号:

S812

常学向, 赵文智, 赵爱芬. 祁连山区不同海拔草地群落的物种多样性[J]. 应用生态学报, 2004, (9): 1599-1603.

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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