松嫩平原南部主要群落植物多样性的比较研究

Species diversity of main communities in South Songnen Plain

应用Ｍａｒｇａｌｅｆ（Ｒ１）和Ｍｅｎｈｉｎｉｃｋ（Ｒ２）丰富度指数、Ｈｉｌｌ多样性指数（Ｎ１，Ｎ２）和Ｐｉｅｌｏｕ均匀度指数（Ｅ）比较研究了松嫩平原南部１４个主要群落的植物多样性、生活型多样性及植物多样性与群落演替的关系结果表明，分布于低平原的羊草－蔓萎陵菜群落的植物多样性和丰富度指数最大，Ｒ１为１１．９６，Ｒ２为５．２４，Ｎ１为１３．９２，Ｎ２为８．７６，分布于固定砂丘的榆树疏林和贝加尔针茅等４个群落有较高的植物多样性，而分布于碱化草甸的角碱蓬等群落植物多样性最小，Ｒ１为１．３１，Ｒ２为０７１，Ｎ１为１．８４，Ｎ２为１．４６．具有较高植物多样性的群落其植物生活型多样性指数也较高．在演替系列中，羊草群落的植物多样性指数介于演替初期和中期阶段之间．

In this paper, the species and life form diversities of fourteen main communities in South Songnen Plain and the relationship between species diversity and community succession are analysed by using Margalef and Menhinick richness indices(R1, R2 ), Hill cliversity indices(N1,ac) and Pie1Ou evenness index(E). The results show that the species diversity and richness index of ferns ohly￣Potentallta jhadtaris community distributed on lOwland are thehighest, those of Ulmus Pn mile, Stick IAllkalensis, Stick fohalensic + Filifolium sderiCUm and Stipa grabing communities distributed on dunes are the second. while the corTununities distributed on alkalized meadow, such as Suaeda corniculata, are the lowest. Communities with higher speCies diversity have a higher life form diversity. The species diversity index of Anenrolepidium chinense community is situated at the stage between initial and middle successional series,