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不同演替阶段鼢鼠土丘群落植物多样性变化研究
引用本文:江小雷,张卫国,杨振宇,杜国祯.不同演替阶段鼢鼠土丘群落植物多样性变化研究[J].应用生态学报,2004,15(5):814-818.
作者姓名:江小雷  张卫国  杨振宇  杜国祯
作者单位:1. 兰州大学,兰州,730020
2. 甘肃省玛曲县畜牧局,玛曲,747300
基金项目:国家自然科学基金重大研究计划资助项目 ( 90 2 0 2 0 0 9)
摘    要:用空间序列代替时间序列的方法对高寒草甸不同演替阶段高原鼢鼠土丘植物群落的物种组成和多样性变化进行了研究.结果表明,不同演替阶段鼠丘植物群落的物种组成及外貌特征与原生植被(对照)之间存在较大差异.在演替的早期阶段,r对策者如萼果香薷、灰绿藜、鹅绒委陵菜、细叶亚菊等演替先锋种在群落中占相对重要地位.随着演替的进展,k对策者如长毛风毛菊、垂穗披碱草、甘肃嵩草、线叶嵩草等在群落中的比例增加.α多样性分析表明,随着演替的进展,群落物种丰富度指数(O)显著增加,其排列顺序为:阶段1<阶段2<阶段3<阶段4<原生植被;均匀度指数(Pielou均匀度指数)的变化趋势与丰富度指数相同;多样性指数(Simpson指数D和Shannon-.Wiener指数H’)按群落的演替梯度呈增加趋势.卢多样性分析表明,阶段1与原生植被及阶段1与阶段4植物群落物种组成的相似系数最小,为0.18;阶段1与阶段2植物群落物种组成的相似系数最大,为0.62.同时,群落生活型功能群组成也随鼠丘的演替进展而发生变化,反映出不同演替阶段的鼠丘植物群落和微生境都发生了改变.

关 键 词:高寒草甸  鼠丘  演替阶段  多样性  功能群
文章编号:1001-9332(2004)05-0814-05
修稿时间:2002年10月12

Plant diversity variations in zokor-mound communities along a successional stage
JIANG Xiaolei ,ZHANG Weiguo ,Yang Zhenyu ,DU Guozhen.Plant diversity variations in zokor-mound communities along a successional stage[J].Chinese Journal of Applied Ecology,2004,15(5):814-818.
Authors:JIANG Xiaolei  ZHANG Weiguo  Yang Zhenyu  DU Guozhen
Institution:Lanzhou University, Lanzhou 730020, China.
Abstract:Using an approach of spatial sequence instead of temporal sequence, this paper studied the composition and diversity of plant species on zokor-mound along a successional gradient in alpine meadow. The results indicated that the species composition and structure of vegetations on zoker-mound along different successional stages were quite different from those of original vegetations. During the early stage of succession, the pioneer species with numerous widely dispersed seeds or spores (r strategy), such as Elsholtzia ciliata, Chenopodium glaucum, Potentilla anserina, and Ajania tenuifolia, dominated in the community. As the progression of succession, the proportion of species with vegetative expansion (k strategy), such as Saussurea hieracioides, Elymus nutans, Kobresia kansuensis, and Kobersia capillifolia, increased in the community. The analysis of Alpha diversity indicated that both species richness and evenness, in increasing order, changes as stage 1 < stage 2 < stage 3 < stage 4 < original vegetation, while Simpson index (D) and Shannon-Wiener index (H') increased significantly as the progression of succession. The analysis of Beta diversity showed that the similarity coefficient of species composition of community between stage 1 and stage 4 and between stage 1 and original vegetation was the lowest (0.18), while that of community between stage 1 and stage 2 was the highest (0.62). The functional diversity of lif form also manifested some obvious changes along the successional gradient, showing that plant community and mini-habitat changed along a successional gradient on zokor-mound.
Keywords:Alpine meadow    Zoker-mound    Successional stage    Diversity  Functional group  
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