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《Journal of Changchun University of Science and Technology》 2003-02
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LIN Nian-feng,TANG Jie (College of Environment and Resou rces, Jilin University, Changchun130026,China)  
From the viewpoint of Quaternary environmental evolution,the ev ol ution processes of development and retrogression of desertification in North Chi na have been studied. In the hemera of the kataglacial epoch(18~15 kaB.P.) the c limate was inclement, cold and dry, and the area of deserts and loess expanded. Since Holocene (11 kaB.P.) the climate became warm and 9~5 kaB.P. was the most h ot and humid in Holocene. The dry desert plants and semi-arid and arid grassland on north area were replaced by temperate forest and there were many layers of p aleosol in the sandy and loess layers. Since the middle Holocene (5~2.5 kaB.P.) the climate turned to dry-cold but still develop paleosol layers. The natural an d man- made factors cause desertification evolution of development and retrogres sion. In the later Holocene (2.5 kaB.P.~) the climate of dry-cold continued unt i l the climate of warm came in the latter half of 20 th and desertification develop rapidly in the whole world. The complexity of desertification problem ha s been indicated and the concept about the desertification has been discussed in the paper. The desertification has been classed into 4 types and 10 sub-types, they are sandy, aqueo-residual, saline-alkali and rock desertification. The conc lusion and suggestion about desertification study have been put forwarded.
【Fund】: 国家自然科学基金项目 (40 0 72 0 93 4 0 2 730 4 7)
【CateGory Index】: X141
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