罗布泊遥感影像“耳纹”特征分析及其环境意义

Analysis of Lop Nur "Ear" Features in Remote Sensing Image and Its Environmental Meaning

研究典型干旱区的罗布泊,对揭示区域环境演变特征和全球变化具有重要意义。从遥感影像上的"耳纹"特征入手,通过光谱、土壤和地表参数等分析,认为:地表全盐含量和结构差异是形成罗布泊遥感影像"耳纹"特征的直接原因;光谱、全盐含量和土壤粒径的分析结果具有很好的一致性。"耳纹"记录下了罗布泊地区的环境演变特征,这些特征表明:受全球环境影响,湖水在气候不断干旱的过程中逐渐干涸,干涸过程的气候调整,使罗布泊地区经历了两次相对湿润的气候环境,前一次较长,后一次很短。

There is a great significance of revealing the characteristics of regional environment evolution and global change to the research on arid Lop Nur areas.By the ＂Ear＂ features of Lop Nur in remote sensing image,the spectrum,soil and surface parameters were analyzed.The differences in total salt content in soil and the surface structure bring are cause directly for the ＂Ear＂ features in remote sensing image;The results of the analysis of spectrum,total salt content and particle size are in good agreement.＂Ear＂ features recorded the process of environmental change.The process implys that Lop Nur dried up gradually under the impact of global change.The adjustment during the process of drying up let Lop Nur experience two relatively humid climates,with the previous a little longer,the later very short.