青海湖北岸山地干草原植物群落多样性分析

Analysis on plant community diversity of mountainous steppe on northern bank of Qinghai Lake

通过对青海湖北岸山地干草原群落特征及物种多样性的分析,结果表明:可将青海湖北岸芨芨草Achnatherum splendens草地、弃耕地、山坡草地和零星分布芨芨草的草地划分为4种群落类型:芨芨草+早熟禾Poasp.群落、早熟禾+垂穗披碱草Elymusnutans群落、艹洽草Koeleria cristatum+西北针茅Stipakrylovii群落和西北针茅+垂穗披碱草群落。植物多样性指数变化为:Shannon-Weiner指数和Simpson指数变化的大小顺序是滩地>山坡草地>弃耕地>芨芨草草地,Pielou均匀度指数变化的大小顺序为山坡草地>弃耕地>滩地>芨芨草草地,丰富度指数大小顺序为滩地>弃耕地>山坡草地>芨芨草草地。生境条件的差异导致了物种多样性的形成。

Through the analysis of community characteristic and species diversity of mountainous steppe in Qinghai Lake, this paper concluded that Achnatherum splendens grassland, abandoned land, mountain slope grassland and scattered A . splendens grassland were divided into four community types such as A. splendens＋ Poa sp. , Poa sp. -b Elymus nutans , Koeleria cristaturn ＋ Stipa krylowii and S. krylowii＋E, nutans, respectively. The change orders of plant diversity indices such as Shannon-Weiner index and Simpson index were bottomland〉mountain slope grassland〉 abandoned land〉 splendens grassland, the Pielou evenness index ranked as mountain slope grassland 〉abandoned land〉bottomland〉A, splendens, and the richness indices were bottomland〉abandoned land〉mountain slope grassland〉A, splendens grassland. The difference of habitat conditions resulted in the formation of species diversity.