干旱区生态用地时空演变及其土地荒漠化效应研究

干旱区生态用地能有效防治和减缓土地荒漠化的发生、发展，对维护绿洲稳定和生态安全具有重要作用，但长期以来其为自然生态系统和人类社会提供的生态服务功能被大大低估。针对目前缺乏生态用地与土地荒漠化关系的定量刻画，以及防止土地荒漠化发生的生态用地适宜规模等问题，本研究拟以塔里木盆地为例，在构建生态用地分类体系的基础上，融合多分辨率遥感源、专题图和野外调查数据，实现较大范围生态用地空间信息的提取；分析研究区生态用地的数量、类型、空间分布及演变特征；选取大量不同面积、不同位置的多尺度流域单元，应用统计学方法、阈值理论和GIS技术，定量揭示生态用地变化与土地荒漠化的关系及其尺度效应和空间差异性，探讨流域防止土地荒漠化发生的生态用地合理比例。本研究在学术上可丰富干旱区生态用地定量研究的理论与方法体系，实践上则为区域防止土地荒漠化和绿洲可持续发展提供科学参考。

Ecological land, which can effectively control and alleviate the occurrence and development of land desertification, is important for the stability and ecological security of the oasis in arid region. However, ecosystem services and functions provided by ecological land for natural ecosystems and human society have been greatly underestimated at a long time. It lacks an effective protection and rational utilization of ecological land. Recent studies lack a quantitative characterization of the relationship between the ecological land and the land desertification is. Taking the Tarim Basin for example, this study would establish a classification system of ecological land use, integrate multi-resolution remote sensing sources, thematic maps and field survey data, and develop an algorithm for mapping ecological land use classification. Then area, spatial pattern, and spatio-temporal dynamic characteristic of different ecological land types would be analyzed. Based on statistical methods, threshold theory and GIS technology, this study can analyze the relationship between ecological land and land desertification at multi-scale spatial units with different sizes and locations. Further, the reasonable area proportion of ecological land use would be investigated in this study. This study can enrich the theory and methodology of ecological land research in arid zones, and also it can provide a scientific reference for rational allocation of land and water resources and sustainable development for the oasis.