鄱阳湖砂山地区地表环境结构与其植物多样性的变化  

Environment structure of earth surface and its diversification of plant species diversity in sandy hill area,Poyang Lake,southern China.

作　　者：胡胜华[1] 常旭[2] 

机构地区：[1]中国地质大学环境学院 [2]北京师范大学地理学院

出　　处：《北京林业大学学报》2007年第6期86-92,共7页Journal of Beijing Forestry University

基　　金：鄱阳湖综合地理教学基地首期建设研究项目(200329);中国地质大学研究生学术创新与探索基金项目(200501)

摘　　要：该文对鄱阳湖砂山地区地表环境结构和土地风沙化过程中物种多样性的变化特征进行了分析,依据植物种在各类型风沙化土地出现的频率与不同风沙化阶段各生活型植物种的组成,探讨了风沙化过程中植物种绝灭与定居的特点.物种多样性指数分析表明:风沙化过程是物种多样性衰减的过程,风沙化首先导致特有种的灭绝,其次为稀有种.从植物的生活型来看,多年生草本与乔木类植物受风沙化影响最大,而灌木类植物可存活风沙化过程各个阶段,在风沙化过程中植物种的绝灭速率大于定居速率.要建立有恢复力的砂山景观生态系统,进行生态重组,既需要在砂山地区内也需要在砂山地区外的生态存储,现实情况也需要这种双重存储的生态学准备.This paper analyses the environment structure of earth surface and the changing characteristics of species diversity during the process of desertification in the sandy hill area of Poyang Lake,southern China.Based on the frequency of plant species occurrence at different types of desertificated lands and the life-form composition of plant species at different stages of desertification,the characteristics of plant species＇ colonization and extinction were discussed.The indices of species diversity showed that the process of desertification was a process of biodiversity losing.Especially,the desertification will result in the extinction of endemic species first,then the rare species.In terms of the plant life-form,perennial herbaceous and arbor plants were severely affected by the process of desertification,whereas shrub species survived at all stages of the process of desertification.During the process,the extinction rate of plants was higher than the colonization rate.To construct recuperative ecosystem of sandy hill,conducting ecology recombination required ecostorage in the sandy hill area and outside of it as well.Ecological preparation of this dual storage is also required considering the realistic conditions.

关 键 词：鄱阳湖砂山地区 物种多样性 物种多样性指数 种丰富度 风沙化过程 生态存储 

分 类 号：Q948.1[生物学—植物学]