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以事例为参考阐述了过去几千年中国沙漠的自然干燥和干旱化过程 ,介绍了人类活动 ,如河流中上游地区的过度开发和用水引起的土地荒漠化。讨论了中国所开创的沙丘固定技术和措施。最后论述了贺兰山和腾格里沙漠地区土地退化逆转措施 ,并对农用土地的改良进行了评价。
A case study is taken as an example to illustrate the process of natural drying and aridification in the deserts of China in the past several thousand years. Anthropogenic activities such as over-exploitation in the upper and middle reaches of rivers and desertification caused by water use are introduced. Discussed the dune fixation technology and measures initiated by China. Finally, the paper discusses the reversal measures of land degradation in Helan Mountain and Tengger Desert, and evaluates the improvement of agricultural land.