沙漠化遥感监测与定量评价研究综述

A Review of Remote Sensing Monitoring and Quantitative Assessment of Aeolian Desertification

土地沙漠化是当今世界最为严重的环境-社会-经济问题之一,遥感技术以其宏观性、综合性、获取信息量大、时间周期短等优势,已成为沙漠化监测与定量评价的重要数据来源和技术手段。本文阐述了国内外运用遥感技术监测与评价沙漠化研究进展,归纳总结了几种常用的定量指标(FVC/NPP、RUE、Albedo、LST、土壤湿度等)和沙漠化信息定量提取方法(专题指数提取法、ANN、混合像元分析法、决策树分类法等)。分析指出目前沙漠化遥感监测与评价指标体系不完善、尺度效应以及沙漠化信息提取方法方面的研究不足,并提出开展沙漠化多指标、多尺度综合监测与评价研究是未来的发展趋势之一。

Aeolian desertification is one of the most serious environment-society-economy questions in the world.Depending on the strength of macroscopic,synthesis,abundant information,quickly updated data,remote sensing has become an important data source and technology for monitoring and assessing desertification.In this paper,the research progress in applying remote sensing technology to monitor and assess aeolian desertification was reviewed,some key indicators such as FVC,NPP,RUE,albedo,LST,soil moisture content,and several quantitative methods of extracting aeolian desertification were also discussed,such as the thematic indexes extracting method,artificial neural network(ANN),decomposing mix element,decision tree classification,etc.Finally,lack of current research on indicator system,scale effect and the weakness of information extraction means were pointed out.In addition,to develop multi-indicator and multiscale comprehensive analysis was put forward as one of study trends in aeolian desertification monitoring and assessment.