额济纳绿洲沙尘暴沉积特征 Deposition of sandstorms in a vegetation-covered sand dune in Ejin

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额济纳绿洲沙尘暴沉积特征

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

"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.

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作 者: 温小浩 李保生 王为 LI Sen OU Xianjiao ZHENG Yanming WEN Xiaohao LI Baosheng WANG Wei LI Sen OU Xianjiao ZHENG Yanming  
作者单位:温小浩,李保生,王为,WEN Xiaohao,LI Baosheng,WANG Wei(华南师范大学)水利论文vG5Kpu&q(L
LI Sen,LI Sen(Department of Tourism, Resources and Environment, Foshan University, Foshan 528000, China)水利论文ajZZ,X
OU Xianjiao,ZHENG Yanming,OU Xianjiao,ZHENG Yanming(School of Geography, South China Normal University, Guangzhou 510631, China) 
刊 名:地理学报(英文版)  ISTIC SCI
英文刊名:JOURNAL OF GEOGRAPHICAL SCIENCES 
年,卷(期):2006 16(4) 
分类号:K9 
关键词:Ejin Oasis   vegetation-covered sand dune   dust storm   sandstorm   grain size   major chemical element  
机标关键词:额济纳绿洲沙尘暴沉积特征scanning electron microscopethe middle Yellow Riverchemical analysissandy soilssand dune 
基金项目:国家重点基础研究发展计划(973计划),中国科学院知识创新工程项目 
下一篇:国际地理联合会2006年区域会议在布里斯班举行 IGU-2006 Brisbane Conference Convened in Brisbane, Aust
上一篇:中国干旱区不同成因碎屑沉积物的吹蚀速率研究 Deflation rates of different clastic sediments in the ari
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