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中国沙漠 ›› 1997, Vol. 17 ›› Issue (3): 226-229.

• 研究论文 • 上一篇    下一篇

1.2 Ma B.P.以来西宁盆地沙漠化问题初探

曾永年1, 马海洲2, 李玲琴1, 李珍1, 沙占江1, 曹广超1   

  1. 1. 青海师范大学地理系, 西宁 810080;
    2. London Unirersity London England
  • 收稿日期:1997-01-17 修回日期:1997-03-15 出版日期:1997-09-20 发布日期:1997-09-20
  • 作者简介:曾永年,男,1959年出生,副教授。主要从事地貌与环境、遥感与地理信息系统方面的教学与研究工作。
  • 基金资助:
    国家自然科学基金项目(49361006)

FIRSTLY DISCUSS ON PROBLEMS OF DESERTIFICATION IN XINING BASIN SINCE 1.2 Ma B.P.

Zeng Yongnian1, Ma Haizhou2, Li Lingqin1, Li Zhen1, Sha Zhanjiang1, Cao Guangchao1   

  1. 1. Department of Geography, Qinghai Normal University, Xining 810008;
    2. London University, London England
  • Received:1997-01-17 Revised:1997-03-15 Online:1997-09-20 Published:1997-09-20

摘要: 西宁盆地大墩岭黄土剖面L1L2L15中存在3层古风成砂。沉积年代及各种环境记录的分析表明,这3层古风成砂分别代表了1.2 Ma B.P.以来西宁盆地在中更新世初、中更新世末和晚更新世晚期发生的3次较大规模的流沙活动。进一步分析得出西宁盆地的沙漠化正逆过程受制于第四纪全球气候波动变化以及青藏高原隆升的影响。第四纪青藏高原冰川的冰缘作用为其边缘的沙漠、黄土沉积提供了丰富的物质来源。

关键词: 西宁盆地, 古风成砂, 气候变化

Abstract: There are three eolian paleosand layers existed in the loess profile of Dadunling,Xining Basin.The age and environmental records of the loess stratigraphy proved that these three eolian paleosand layers which represented three extensive desert expansion periods in Xining Basion since 1.2 Ma B.P.were formed in the early part and the latter part of the Middle Pleistocence,the latter part of the Last Pleistocence individually.Furthermore,the advance and the inverse processes of desertification in the studied area were controlled by the Quaternary climatic changes and the uplift of Qinghai-Xizang plateau.In details,the periglacial action of plateau glacier in Quaternary has produced a lot of materal source for desert and loess deposition in adjacent areas.

Key words: Xining Basin, Eolian paleosand, Climatic changes

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