民勤绿洲退耕地植物群落多样性研究  

Diversity of Plant Communities of Rehabilitated Land on Minqin Oasis

作　　者：王多泽[1,2] 金红喜 

机构地区：[1]甘肃农业大学,甘肃兰州730070 [2]甘肃民勤荒漠草地生态系统国家野外科学观测研究站

出　　处：《防护林科技》2010年第6期1-4,43,共5页Protection Forest Science and Technology

基　　金：国家科技支撑计划课题(2007BAD46B04)

摘　　要：通过对民勤绿洲内部退耕地植被恢复系列不同阶段的群落取样,研究了植被恢复过程中群落物种的组成、多样性变化过程。结果显示:在50 a自然恢复过程中,群落可大致划分为1年生草本植物群落阶段、多年生草本植物群落阶段、草本灌木植物过渡阶段和灌木植物阶段。所有调查群落的物种组成简单,单科单属植物种所占的比重很大。随恢复年限的延长,群落中物种丰富度指数S和Margalef指数呈下降趋势;物种多样性指数Simpson和Shannon-Wiener指数在退耕初期和退耕30、40 a的植被群落中最高;退耕地群落中的均匀度指数Pielou和Alatalo指数都高于原始自然群落,说明经过50 a的自然恢复,绿洲退耕地仍然没有达到相对稳定的状态,群落仍然在发展。Diversity change process composition of species during the recovery process of vegetation were studied through community samplings at different stages with vegetation restoration series of rehabilitated lands on Minqin oasis.Result shows that： in the 50 years of natural recovery process,the community can be broadly divided into an annual herb community stage,community stage of perennial herbs,shrubs,herbaceous shrubs transition.The species compositions of all investigated communities are simply,and more species belong to single family genus.With the extended recovery period,indices of species richness S and Margalef index decreased among vegetation communities;Simpson species diversity index Shannon-Wiener index are the highest in early stage 30-40 years of rehabilitated farmland among vegetation communities;Pielou evenness index Alatalo index of rehabilitated farmland in the community are higher than that of the original natural communities;it shows that,after 50 years of natural recovery,oasis rehabilitated farmland is still not reached a relatively stable state,the community is still in development.

关 键 词：民勤绿洲 退耕地 自然恢复 物种多样性 

分 类 号：S718[农业科学—林学]