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中国沙漠 ›› 2020, Vol. 40 ›› Issue (5): 158-168.DOI: 10.7522/j.issn.1000-694X.2020.00088

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毛乌素沙地和库布齐沙漠风成沙粒度参数的空间变化及其成因

刘倩倩1(), 杨小平2()   

  1. 1.复旦大学 历史地理研究中心,上海 200433
    2.浙江大学 地球科学学院,浙江 杭州 310027
  • 收稿日期:2020-07-16 修回日期:2020-08-21 出版日期:2020-09-28 发布日期:2020-09-28
  • 通讯作者: 杨小平
  • 作者简介:杨小平(E-mail: xpyang@zju.edu.cn
    刘倩倩(1989—),女,山东滨州人,博士,研究方向为干旱区地貌与环境演化。E-mail: sttail_qqLiu@126.com
  • 基金资助:
    国家自然科学基金项目(41672182);科技部科技基础资源调查专项(2017FY101000)

Spatial variations of grain size parameters of dune sands in the Mu Us Sandy Land and Hobq Sand Sea, northern China and its potential causes

Qianqian Liu1(), Xiaoping Yang2()   

  1. 1.Institute of Chinese Historical Geography,Fudan University,Shanghai 200433,China
    2.School of Earth Sciences,Zhejiang University,Hangzhou 310027,China
  • Received:2020-07-16 Revised:2020-08-21 Online:2020-09-28 Published:2020-09-28
  • Contact: Xiaoping Yang

摘要:

分析了毛乌素沙地东部、西部和库布齐沙漠现代风成沙样品的粒度组成。结果显示:毛乌素沙地东部和西部风成沙粒度特征具有显著差异,西部风成沙粒度较小、分选较好;库布齐沙漠风成沙粒度特征与毛乌素沙地西部相似;沙源碎屑物质的机械组成应是影响毛乌素沙地和库布齐沙漠风成沙粒度特征的主要因素;就地起沙是毛乌素沙地和库布齐沙漠风成沙的重要来源,且其贡献比例具有区域差异性;受复杂沙源和风力-河流混合搬运方式的影响,平均粒径(Mz)和分选系数(σ)并没有呈现出显著的与盛行风向一致的空间变化规律。

关键词: 地貌学, 沙丘, 粒度参数, 空间分析

Abstract:

We collected and measured aeolian sand samples from the Mu Us Sandy Land and the Hobq Sand Sea of northern China. The data of grain sizes show that aeolian sands in the eastern and western Mu Us Sandy Land are quite different. The aeolian sands in the western Mu Us Sandy Land are much finer and better sorted compared with those in the eastern Mu Us Sandy Land. Aeolian sands in the Hobq Sand Sea show similar grain size characteristics to those of the western Mu Us Sandy Land. We conclude that the initial grain sizes of source materials could be the main factors for the regional variations across these aeolian environments. Local detritus act as an important provenance for aoelian sands of Mu Us Sandy Land and Hobq Sand Sea, and its contribution varies regionally. Influenced by complicated provenances and mixed transportation by winds and rivers, the values of mean grain size (Mz) and sorting coefficient (σ) do not show obviously spatial variations which would be associated with the prevailing wind directions in the study areas.

Key words: geomorphology, dune, grain size parameter, spatial analysis

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