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中国沙漠 ›› 1997, Vol. 17 ›› Issue (4): 377-382.

• 研究论文 • 上一篇    下一篇

雅鲁藏布江江当宽谷地区沙源物质与现代沙漠化过程

刘连友, 刘志民, 张甲珅, 王建华, 陈怀顺   

  1. 中国科学院兰州沙漠研究所, 兰州 730000
  • 收稿日期:1996-12-23 修回日期:1997-03-15 出版日期:1997-12-20 发布日期:1997-12-20
  • 作者简介:刘连友,男,1962年出生,副研究员。主要从事干旱区现代地貌过程研究。

SAND SOURCE OF SAND DUNE AND MODERN DESERTIFICATION PROCESS IN JIANDANG WIDE VALLEY AREA OF YARLUNG ZANGBO RIVER

LIU Lian-you, LIU Zhi-min, ZHANG Jia-shen, WAN Jian-hua, CHEN Huai-shun   

  1. Institute of Desert Research, Chinese Academy of Sciences, Lanzhou 730000
  • Received:1996-12-23 Revised:1997-03-15 Online:1997-12-20 Published:1997-12-20

摘要: 对雅鲁藏布江江当宽谷附近地表堆积物的粒度和矿物分析结果表明,沙丘沙的平均粒径、分选性、主粒组构成以及矿物成分与附近沙源物质具有一致性和继承性。河流冲积物是最主要的沙源,其次是洪积物和基岩风化物。河谷沙漠化从根本上就是沙源物质"就地起沙"导致的土地退化过程。同时,沙源物质的差异决定了沙漠化发展速度和性质的复杂性。

关键词: 雅鲁藏布江江当宽谷, 沙漠化, 沙源物质, 粒度特征, 矿物成分

Abstract: Laboratory analysis results of the land surface sediments from Jiangdang wide valley area of Yarlung Zangbu River reveal that there are chiefly three different kinds of source sediments.Among them,the fluvial deposit consists of the majority,and secondly come the alluvial deposit and weathered bedrock residue.Desertification in this area is fundamentally resulted from soure sediments' activation by wind.Meanwhile,the differences of sand soure sediments influence the rate and feature of desertification.

Key words: Jiangdang wide valley of Yarlung Zangbo River, Desertification, Sand source sediments, Grain-size character, Mineral components

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