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中国沙漠 ›› 2016, Vol. 36 ›› Issue (1): 158-166.DOI: 10.7522/j.issn.1000-694X.2015.00058

• 沙漠与沙漠化 • 上一篇    下一篇

毛乌素沙地现代沙丘沙的粒度特征及其意义

舒培仙1, 牛东风1, 李保生1,2, 温小浩1, 司月君3, 郭亿华4, 胡观冠5   

  1. 1. 华南师范大学 地理科学学院, 广东 广州 510631;
    2. 中国科学院地球环境研究所 黄土与第四纪地质国家重点实验室, 陕西 西安 710061;
    3. 广西师范学院 地理科学与规划学院, 广西 南宁 530001;
    4. 广州地理研究所, 广东 广州 510070;
    5. 深圳市南山区第二外国语学校, 广东 深圳 518054
  • 收稿日期:2015-01-07 修回日期:2015-02-11 出版日期:2016-01-20 发布日期:2016-01-20
  • 通讯作者: 牛东风(E-mail:33845410@qq.com)
  • 作者简介:舒培仙(1990-),男,安徽宣城人,硕士研究生,研究方向为地表沉积过程及第四纪环境演变。E-mail:shupeixian@163.com
  • 基金资助:
    国家重点基础研究发展计划项目(2013CB955903);国家自然科学基金项目(41290250);华南师范大学研究生科研创新基金项目(13kj12)

Grain Size Characteristics of Modern Dune Sand and Its Significance in the Mu Us Sandy Land, China

Shu Peixian1, Niu Dongfeng1, Li Baosheng1,2, Wen Xiaohao1, Si Yuejun3, Guo Yihua4, Hu Guanguan5   

  1. 1. Department of Geography, South China Normal University, Guangzhou 510631, China;
    2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
    3. School of Geography and Planning, Guangxi Teachers Education University, Nanning 530001, China;
    4. Guangzhou Institute of Geography, Guangzhou 510070, China;
    5. Nanshan Second Foreign Languages School of Shenzhen, Shenzhen 518054, China
  • Received:2015-01-07 Revised:2015-02-11 Online:2016-01-20 Published:2016-01-20

摘要: 对毛乌素沙地不同类型41个现代沙丘的沙粒度分析结果表明,流动沙丘沙主要由细沙和中沙组成,平均粒径为2.17 Φ;固定-半固定沙丘沙的主要粒级是细沙和极细沙,平均粒径为3.09 Φ。流动沙丘沙平均粒径整体自西北到东南减小,而分选性总体表现为中等-较好,无明显空间变化规律。概率累计曲线和粒度特征参数散点图表明,毛乌素沙地沙丘沙以跃移搬运方式为主,存在着就地起沙和就地堆积的可能。平均粒径和分选性空间变化规律的差异,是在频繁强烈的风沙活动环境下物源和大气环流共同作用的结果。

关键词: 毛乌素沙地, 沙丘沙, 粒度特征, 空间变化

Abstract: In the Mu Us Sandy Land, 41 modern dune sand samples were collected and analyzed by laser particle analyzer. The results show that modern mobile dune sand is mainly composed of fine sand and medium sand with mean grain size of 2.17 Φ, While the main grain size fraction of modern fixed/semi-fixed dune sand is fine sand and very fine sandwith the mean grain size of 3.09 Φ. On the whole, the mean grain size of modern mobile dune sand becomes gradually shorter from the northwest to the southeast in the Mu Us Sandy Land, but the sorting don't see the similarity space change rule. The log-probability cumulative curves and grain size parameters scatter diagram show the Mu Us Sandy Land is in a frequent and strong wind activity environment, and the most important aeolian transports style is saltation, which implys a possibility of the local sand source and local accumulation. However, different space change rules of the mean grain size and sorting is the result of the interaction of the frequent strong wind environment, sand source and the atmospheric circulation.

Key words: Mu Us Sandy Land, dune sand, grain size characteristic, spatial variation

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