基于遥感的土地荒漠化侵蚀因子的厘定--以北京及北部邻区为例

本项研究通过研究区不同时相(1987TM、1996TM和2000CCD)遥感图像荒漠化不同程度(轻、中、重)的定量信息提取。利用地理信息系统空间分析功能，研究基于遥感信息提取的不同程度荒漠化对应的气象、地形、地貌、水、土壤质地和人环境等多元信息，系统阐述荒漠化演化中驱动因素作用，提取荒漠化驱动因子，并运用层次分析法(AHP)确定各因子权重，度量主要侵蚀因素对侵蚀的贡献，以期为土地荒漠化的防治提供科学依据，同时为相关研究提供借鉴和参考。

Appraisal of Desertification Factors Based on Remote Sensing Technology--Taking Beijing and Its Northern Neighboring Area as an Example

Land desertification is one of serious environmental and social economical problem. The developing speed and serious disaster of desertification have caused international attention. The research of dynamic land desertification based on RS technology is important to the prevention and cure of the desertification, even to the global environment supervising. According to the analysis of remotely sensed data (1987 TM, 1996 TM and the CB-1s CCD 4, 3, 2 bands of 2000, 4 orbits and 16 (CBERS-1) scenes with the resolution 19.5m) and other multi-information of study area (with the range of longitude: E113.5o-117o and of the latitude N39.5o-42o), we have obtained the distribution of the desertification and evaluated space-time information. Based on the remote sensing interpretation and database of desertification, multi-factors are distilled by GIS from the aspects of weather, land form, relief, hydrology, agrotype, and the environment of human culture. Then we use AHP method to compute the weights of the erosion factors, which could provide reference for the relevant researches and contribute to the prevention and cure of the desertification.