延安示范区土地利用与退耕还林的时空变化研究

以航片等资料为基础，借助遥感影像解译、地理信息系统空间分析功能以及数理统计方法，分析了延安生态建设示范区2000—2003年间各土地利用类型的数量变化和空间特征，并且首次引入退耕指数、退耕弹性系数等指标对退耕还林工作进行评价。揭示了该区各类用地数量变化的幅度、速度和区域差异以及退耕还林的强度和规模。阐明了区域土地利用变化与退耕还林的关系特点，为区域水土保持和土地可持续利用提供科学依据。

Spatio-temporal Change of Land Use and Converting Slope Farmland into Forest and Grassland in Yanan Ecological Construction Demonstration Area

Based on the color aerial photo and the field survey data, this paper analyze the information of various land use type change and spatial characteristics in Yanan Ecological Construction Demonstration Area from 2000 to 2003 by RS, GIS and statistics methods. We introduce the de-farming index and the de-farming Elasticity coefficient for the first time to evaluate the intensity, scale and spatial diversity of converting slope farmland into forestry and grassland, and to find out the range and pace of various land use type. This research illuminates the relationship between regional land use change and the project of converting slope farmland into forestry and grassland, and this research can give scientific suggestion to research on regional soil and water conservation and sustainable land use