土地利用变化对洞庭湖区生态系统服务价值的影响

土地利用变化对区域生态系统服务价值动态变化研究具有重要意义，为区域土地利用规划、生态环境保护和生态恢复提供了科学依据。近年来洞庭湖区土地利用状况波动频繁,研究其生态系统服务价值的变化情况,可以为该区正在进行的生态重建提供依据。参照中国陆地生态系统单位面积服务价值表， 在土地利用类型划分的基础上将洞庭湖区生态资产划分为7类，利用洞庭湖区两期土地利用数据,估算了土地利用变化引起的生态系统服务价值的变化，结果表明：①20世纪80年代末为中点，前10年湖区生态系统服务价值亏损，后10年生态价值回升并有所提高，表明湖区生态建设出现一定成效；②虽然水域生态系统服务价值是湖区生态系统价值的主要构成部分，但湿地生态系统价值变化决定湖区生态系统总价值的变化趋势。

EFFECTS OF LAND USE CHANGE ON THE ECOSYSTEM SERVICES VALUE IN THE DONGTING LAKE AREA

It is of great significance to conduct some research on the change of ecosystem services value,via the reseach on the change of the land use,in order to provide reference on land use layout,eco-environment protection and ecological recovery.Recently,the status of land use in Dongting Lake Area fluctuates frequently.The research on the dynamic ecosystem services value may provide suggestions on the eco-rehabilitation in this area.Based on table of Chinese ecosystem service value per unit area of different ecosystem types and on the land use change data of Dongting Lake Area,the ecological assets were divided into 7 types;the ecological value coefficients were set and the research on the change of ecosystem services value(ESV) was carried out during the time from 1980 to 2000s.The result shows that:(1) If defining the 1980 as the midpoint,the former decade had a decline of ESV,while the latter an increase,indicating the achievement of ecosystem construction of the area.(2)The change of wetland's ESV determined the change of the whole ESV of the Dongting Lake; the water area ESV dominated the main portion of ESV in the whole area.