毛乌素沙地东南部边缘不同成因类型土地沙漠化的特征
Characteristics of land desertifications of different origins on the southeastern margin of the Mu Us desert
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摘要: 以毛乌素沙地南部边缘沙漠黄土地带的土地沙漠化为例,将研究区的土地沙漠化分为沙地内部就地起沙型沙漠化、河流谷地就地起沙型沙漠化、风化残积就地起沙型沙漠化和风沙侵入型沙漠化4种类型.深入分析了不同成因类型的沙漠化土地的粒度特征及其所代表的地质意义.同时,以遥感解译和野外路线地质调查为手段,分析了不同类型土地沙漠化的区域分布.最后,探讨了不同地质成因类型土地沙漠化划分的理论意义、环境地质学意义和对土地沙漠化防治的重要意义,提出了不同类型土地沙漠化防治的对策和建议.Abstract: Take for example land desertification in the desert-loess zone on the southeastern margin of the Mu Us desert, the land desertifications in the study area are divided into the sands interior in-situ sand accumulation type, river valley in-situ sand accumulation type, weathering-residual in-situ sand accumulation type and windblown type. The grain-size features of desertified lands of different genetic types and their geological implications are analyzed intensively. In addition, the regional distribution of different types of land desertification is analyzed by means of remote sensing interpretation and geological reconnaissance. At last, the theoretical and environmental-geological aspects of the classification of land desertificatiom of different geological origins and their great significance for the prevention and control of land desertification are discussed and countermeasures and suggestions for the prevention and control of land desertifications of different origins are put forward.
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