地理科学 ›› 1997, Vol. 17 ›› Issue (3): 201-207.doi: 10.13249/j.cnki.sgs.1997.03.201

• 论文 • 上一篇    下一篇

地表物质迁移的构成特征及其地域变化

许炯心   

  1. 中国科学院/国家计划委员会地理研究所, 北京100101
  • 收稿日期:1995-01-11 修回日期:1996-09-06 出版日期:1997-05-20 发布日期:1997-05-20
  • 基金资助:
    国家自然科学基金

AREAL VARIATION IN THE RELATION BETWEEN CHEMICAL AND MECHANICAL DENUDATIONS IN THE MONSOON INFLUENCED EASTERN CHINA

Xu Jiongxin   

  1. Institute of Geography, Chinese Academy of Sciences, Beijing 100101
  • Received:1995-01-11 Revised:1996-09-06 Online:1997-05-20 Published:1997-05-20

摘要: 提出地表物质迁移构成特征的概念及其指标,运用我国东部季风影响范围内近60条河流的资料,探讨了地表物质迁移构成特征与影响因子的关系,并研究了我国地表物质迁移构成特征随纬度的变化。

Abstract: The earth surface sediment transport is composed of two parts:the transport of non-soluble debris and that of dissolved solids,which are the results of mechanical and chemical denudations.Accordingly,the following index is proposed to describe the composition of total sediment transfer:I=Dc/Dt=Dc/(Dc+Dm) where Dc and Dm are surface sediment transfer due to chemical and mechanical denudations,respectively,Dt is total surface sediment transfer.This index is found to be closely related to zonal natural factors such as precipitation,temperature and vegetation.The Dc/Dt value increases with mean annual precipitation and runoff,and decreases with drainage basin dryness index.In the monsoon influenced eastern China,from south to north,this index decreases rapidly,reaching a minimum,and then increases.This areal variation may be explained by the relation between the chemical and mechanical denudations in different natural zones,which in its turn is controlled by the specific combination of climate and vegetation in each zone.The forest cover in the eastern China is found to vary latitudinally in the same way as the index Dc/Dt,indicating that vegetation is an important factor controlling the relation between chemical and mechanical denudations.