中文摘要：

以外流河绿洲卫宁平原为例，基于MODIS和ETM＋资料研究了绿洲与其外围区域的LST差异。结果显示：1）绿洲与其外围区域的LST差异具有明显的年内变化，该差异在1月最小，在7月上旬最大；2）绿洲与外围LST差异有明显的年际变化，降水越多的年份绿洲与外围的LST差异越小；3）20世纪70年代以来研究区低温斑块的面积明显增大，将来低温斑块有再扩张的可能；4）ok地开发利用或保护恢复措施会影响绿洲的大小和形状，从而影响冷岛结构，所以认为土地利用规划和管理中应考虑不同利用方式对冷岛结构的影响。

英文摘要：

Taking Weining Plain, an exoreic-river oasis, as an instance, the land surface temperature （LST） differentiation between the oasis and its surrounding area was analyzed using MODIS and ETM＋ data. The results revealed that the I.ST differentiation between the oasis and its surroundings changed along with seasons,with the lowest value in January and the highest value in early July. The oasis-surrounding area LST differentiation varied among different years. At interannual time scale, the LST differentiation was negatively relative to annual precipitation From 1970s, lower-LST patch has extended and will likely extend again in future. The exploiting or protecting of desert／semi-desert land could determine the extent and shape of an oasis, and then the cold-island structure in the area, there- fore the paper proposed that the influences of land use on the cold-island structure and then the cold-island effect should be considered in practice of planning and management of desert／semi-desert land use.