Deposition of sandstorms in a vegetation-covered sand dune in Ejin Oasis and its characteristics

查看全文 作　　者：[1]WENXiaohao;LI [1,2]Baosheng;WANG [1]Wei;LI [3]Sen;OU [1]Xianjiao;ZHENG [1]Yanming

机构地区：[1]Sehool of Geography, South China Normal University, Guangzhou 510631, China;[2]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an 710075, China;[3]Department of Tourism, Resourees and Environment, Foshan University, Foshan 528000, China

出　　处：《Journal of Geographical Sciences》索引2006年第16卷第4期,共7页

基　　金：National Basic Research Program of China, No.2004CB720206; Knowledge Innovation Project of CAS, No.KZCX2-SW-118 摘　　要：“Ejin Section” found in a typical vegetation-covered sand dune in Ejin Oasis was investigated. In this study, 263 samples were taken from the section for grain-size analysis, 25 for chemical analysis, 11 for 14C dating and 6 for scanning electron microscope (SEM). The results of the study indicate that 3 types of the sediments in the section can be identified, YS, LS and ST. YS, homogeneous yellow-brown dune sands, is equal to those of inland deserts, LS, loess-like sandy soils, is the same as the sandy loess in the middle Yellow River and modern falling dusts, and ST, sandy sediments interbeded with the deadwood and defoliation of Tamarix spp, represents the depositional process of the section interrupted by abrupt changes in climate. The Ejin Section has recorded the repeated dust-storms or sandstorms since 2500 yr BP and the peak periods of the dust-storms or sandstorms revealed by the section are consistent with the records of “dust rains” in historical literatures, indicating that the change of climate is a key factor to increase sandstorms or dust-storms, whereas, “artificial” factor may only be an accelerating one for desertification. 关键词：植被覆盖沙丘沙尘暴主要化学元素化学分析

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Deposition of sandstorms in a vegetation-covered sand dune in Ejin Oasis and its characteristics

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