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题名: Oasis evolution processes and mechanisms in the lower reaches of Heihe River, Inner Mongolia, China since 1 ka ago
作者: Zhao, H; Sheng, YW; Zhang, JW(张家武); Zhao, Y; Li, GQ(李国强)
收录类别: SCIE
出版日期: 2015-03
刊名: HOLOCENE
卷号: 25, 期号:3, 页码:445-453
出版者: SAGE
出版地: LONDON
英文摘要: Two major oases in the lower reaches of Heihe River, Inner Mongolia of China, the desertified ancient Juyanze oasis (AJO) and the modern Ejina oasis (MEO), experienced dramatic environmental changes and human migrations as documented in historic records. The processes and mechanisms of their evolution are the key for us to understand the environmental changes and human activities in this region, yet are still unclear. This study provides an evolution chronology of these two oases by analyzing the optical dating records from MEO and C-14 dating records from AJO and discusses their evolution mechanisms based on drainage network analysis and field investigations. The optical dating samples collected from aeolian sands below humus layers in Populus euphratica woodlands on MEO indicate that this oasis developed between 1.05 and 0.45ka ago, while the C-14 dating samples collected from a number of dead P. euphratica trees from AJO consistently suggest that the complete desertification of AJO occurred before similar to 400 cal. a BP. These new dating results imply that the two oases evolved simultaneously but in opposite directions. That is, AJO desertified while MEO developed gradually in the last 1ka. Climate change occurring over the last 1ka in northern China cannot explain the opposite evolution directions of these two adjacent oases. The drainage network analysis based on digital elevation models (DEMs) and field observations and the dates (similar to 0.5ka) of the top lacustrine layer from GaxuNur Lake north of MEO suggest that the evolution of the two oases was mainly governed by Heihe River migration.
关键词: ancient Juyanze oasis ; drainage network ; C-14 dating ; modern Ejina oasis ; oases evolution mechanisms ; optical dating
作者部门: [Zhao, Hui] Chinese Acad Sci, Cold & Arid Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China ; [Sheng, Yongwei] Univ Calif Los Angeles, Dept Geog, Los Angeles, CA 90024 USA ; [Zhang, Jiawu ; Li, Guoqiang] Lanzhou Univ, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China ; [Zhao, Yan] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Lanzhou 730000, Peoples R China
通讯作者: Zhao, H (reprint author), Chinese Acad Sci, Cold & Arid Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China.
学科分类: Physical Geography; Geology
文章类型: Article
所属项目编号: National Natural Science Foundation of China [41272190] ; National Basic Research Program of China (973 Program) [2009CB421306] ; CAS ; USGS Landsat Science Team Program [G12PC00071]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划)
项目资助者: NSFC ; MOST
语种: 英语
DOI: 10.1177/0959683614561880
ISSN号: 0959-6836
WOS记录号: WOS:000349531500004
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120552
Appears in Collections:资源环境学院_期刊论文

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Recommended Citation:
Zhao, H,Sheng, YW,Zhang, JW,et al. Oasis evolution processes and mechanisms in the lower reaches of Heihe River, Inner Mongolia, China since 1 ka ago[J]. HOLOCENE,2015,25(3):445-453.
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