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林业科学 ›› 2003, Vol. 39 ›› Issue (2): 98-101.doi: 10.11707/j.1001-7488.20030216

• 论文及研究报告 • 上一篇    下一篇

用稀土元素示踪方法研究裸露坡面沿程侵蚀与沉积

赵晓光 石辉   

  1. 西安科技学院地质与环境工程系,西安710054;西南师范大学资源环境科学学院,重庆400715
  • 收稿日期:2001-06-11 修回日期:1900-01-01 出版日期:2003-03-25 发布日期:2003-03-25

STUDY ON EROSION AND SEDIMENT ALONG THE BARE SLOPING SURFACT WITH REE METHOD

Zhao Xiaoguang,Shi Hui   

  1. Xi'an University of Science and Technology Xi'an 710054;Southwest China Normal University Chongqing 400715
  • Received:2001-06-11 Revised:1900-01-01 Online:2003-03-25 Published:2003-03-25

摘要:

在黄土高原60m长(6°)的黄土裸露直线坡面上每隔1 0m分别横向布设混有稀土La、Se、Nd、Sm、Eu、Dy氧化物的土壤条带,在模拟典型侵蚀性降雨情况下(雨强1.0mm·min-1,历时40min) ,通过量测出口径流泥沙过程对各时段输出泥沙及坡面沿程不同位置6处沉积物中6种稀土元素进行测定分析,结果表明,该坡面主要产沙部位在距分水岭30~50m之间;坡面沿程各处沉积物来源分布相差不显著。

关键词: 土壤侵蚀, 稀土元素示踪, 黄土高原

Abstract:

Soil belts of the oxide with REE such as La、Se、Nd、Sm、Eu and Dy were disposed every other 10?m on the bare straightly sloping surface along sloping length (60 m) and sloping degree (6°) in loess plateau. Under the condition of simulating typically erosive rainfall with fainfall intensity (1.0 mm·min-1) and rainfall duration (40 min), the process of runoff-sediment, sediment discharge of different periods and six kinds of rare earth elements in different positions along the sloping surface were measured and analyzed in the outlet. The results showed that the main place of sediment was 30~50 m from dividing ridge, and the difference of source and distribution about sediment was not obvious along the sloping surface.

Key words: Soil erosion, REE, Loess plateau