Appl ication of <sup>7</sup>Be to Study Spatial Distributed Characteristics of Soil Erosion on Hillslopes Before and Af ter Erosive Rainfall Occurrence

DING Jin-li; ZHENG Fen-li; ZHANG Xin-bao; HE Xiu-bin

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Appl ication of ⁷Be to Study Spatial Distributed Characteristics of Soil Erosion on Hillslopes Before and Af ter Erosive Rainfall Occurrence

- Appl ication of ⁷Be to Study Spatial Distributed Characteristics of Soil Erosion on Hillslopes Before and Af ter Erosive Rainfall Occurrence
- Bulletin of Soiland Water Conservation Vol. 24, Issue 2, Pages: 16-19(2005)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌,陕西,712100
  2. 中国科学院研究生院,北京,100039
  3. 中国科学院水利部成都山地灾害与环境研究所,四川,成都,610041
- 作者简介：
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- Published：2005
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DING Jin-li, ZHENG Fen-li, ZHANG Xin-bao, et al. Appl ication of ⁷Be to Study Spatial Distributed Characteristics of Soil Erosion on Hillslopes Before and Af ter Erosive Rainfall Occurrence[J]. Bulletin of Soiland Water Conservation, 2005, 24(2): 16-19.
DOI：

DING Jin-li, ZHENG Fen-li, ZHANG Xin-bao, et al. Appl ication of ⁷Be to Study Spatial Distributed Characteristics of Soil Erosion on Hillslopes Before and Af ter Erosive Rainfall Occurrence[J]. Bulletin of Soiland Water Conservation, 2005, 24(2): 16-19. DOI：

摘要

结合野外调查方法

利用

Be示踪法研究了直形坡侵蚀性降雨发生前后坡面土壤侵蚀空间分布特征。结果表明

侵蚀性降雨发生前

在20m坡长范围内

Be在坡面不同部位分布的差异性不显著;而全年侵蚀性降雨结束后

Be在坡面不同部位分布有显著差异。侵蚀性降雨发生后表层土壤中

Be含量及其侵蚀性降雨发生前后表层土壤

Be含量的差值皆随坡长的增加而减少

表明坡面土壤侵蚀随坡长增加呈增加趋势。坡面不同部位发生剥蚀或沉积过程有较大的差异

坡面上部距分水岭0～5m坡长范围内主要发生沉积现象;而在8～15m坡长范围内

土壤侵蚀以剥蚀过程为主

且土壤侵蚀最严重。

Abstract

The spatial distributed characteristics of soil erosion on straight hillslopes before and after erosive rainfall are studied with 7Be trace method and field investigation. The results showed that within 20 m of slope length

7Be inventory at 0～2 cm deepth of soil profile in different sloping locations was not significant before occurrence of erosive rainfall

but after occurrence of erosive rainfall in 2004

7Be inventory in different sloping locations was great significant.7Be inventory at 0～2 cm deep after occurrence of erosive rainfall and difference values of 7Be inventory before and after erosive rainfall occurrence decreased as slope length increased with 20m slope length. This indicated that soil erosion increased generally as the increase of slope length. There are great differences in detachmentor deposition process at different sloping locations. At 0～5 m slope length of the upper slope

deposition process was dominant; but at 8～15 m of slope length

detachment was dominant

where soil erosion was very severe.

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⁰

Appl ication of 7Be to Study Spatial Distributed Characteristics of Soil Erosion on Hillslopes Before and Af ter Erosive Rainfall Occurrence

DOI：

摘要

Abstract

关键词

Keywords

references

Appl ication of ⁷Be to Study Spatial Distributed Characteristics of Soil Erosion on Hillslopes Before and Af ter Erosive Rainfall Occurrence