三峡水库建设前后库区10年土地覆盖变化

介绍利用定量遥感监测手段，开展10年间三峡库区土地覆盖监测，采用联合国粮农组织土地覆盖分类系统在150 000尺度下划分38类土地覆盖类型，利用面向对象的信息提取方法，通过多尺度分割和模糊判别的手段开展土地覆盖的信息提取。通过监测分析，三峡库区在2002年耕地总量占总面积43.93%，森林面积占29.03%，与1992年对比，耕地面积减少1.13%，森林面积减少0.13%，灌木林增加了0.58%。影响土地覆盖变化的主要是城市扩展、库区移民、生态环境政策等原因。

LAND COVER CHANGE BEFORE AND AFTER THE CONSTRUCTION OF THREE GORGES RESERVOIR WITHIN 10 YEARS

This paper introduced quantitative approach to detect the change in land cover within 10 years before and after the construction of Three Gorges Reservoir. The Land Cover Classification System of Food and Agriculture Organization of the United Nations is available to divide 38 types of land cover at the scale of 150 000. It is indicated that the farmland accounted for 43.93% of the total land cover in the Three Gorges Reservoir area, and forest area for 29.03%. In Comparison with the land cover in 1992, the farmland reduced 1.13%, forest area reduced 0.13%, and the shrub area increased 0.58%. The factors influencing land cover change are mainly related to urban development, reservoir immigration, and policy of local ecology and environment.