Erosion Rate of Purple Soil on a Cultivated Slope in the Three Gorges Reservoir Region Using <sup>137</sup>Cs Technique

LI Hao; ZHANG Xin-bao; WEN An-bang; SHI Zhong-lin

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Erosion Rate of Purple Soil on a Cultivated Slope in the Three Gorges Reservoir Region Using ¹³⁷Cs Technique

- Erosion Rate of Purple Soil on a Cultivated Slope in the Three Gorges Reservoir Region Using ¹³⁷Cs Technique
- Bulletin of Soiland Water Conservation Vol. 28, Issue 5, Pages: 1-6(2009)
- 作者机构：
  
  1. 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
  2. 中国科学院研究生院,北京,100049
  3. 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西,西安,710075
- 作者简介：
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- Published：2009
- 稿件说明：
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LI Hao, ZHANG Xin-bao, WEN An-bang, et al. Erosion Rate of Purple Soil on a Cultivated Slope in the Three Gorges Reservoir Region Using ¹³⁷Cs Technique[J]. Bulletin of Soiland Water Conservation, 2009, 28(5): 1-6.
DOI：

LI Hao, ZHANG Xin-bao, WEN An-bang, et al. Erosion Rate of Purple Soil on a Cultivated Slope in the Three Gorges Reservoir Region Using ¹³⁷Cs Technique[J]. Bulletin of Soiland Water Conservation, 2009, 28(5): 1-6. DOI：

摘要

坡耕地是三峡库区的重点水土流失区和河流泥沙的主要来源地。采用

137

Cs示踪技术对三峡库区紫色土坡耕地的土壤侵蚀速率进行了定量研究。结果表明

新政小流域的

137

Cs本底值为1420.9Bq/m

; 平均坡度为11.4°的缓坡耕地的

137

Cs面积活度介于398.5～1649.6Bq/m

之间

坡长加权平均值为816.0Bq/m

; 采用改进的简化质量平衡模型计算了坡耕地的土壤侵蚀速率

结果得出该坡地的土壤侵蚀模数介于-3358.8～4937.4t/(km

.a)

其加权平均值为1294.6t/(km

.a)。受犁耕作用的影响

坡耕地两个坡段的土壤侵蚀速率随坡长增加大致都呈下降趋势

并在坡段下方出现了堆积。坡耕地土壤侵蚀速率不高的原因

一方面是由于所研究坡耕地属于缓坡

坡度较小

另一方面则是由于当地农民总结出了一套有效防止水土流失的耕作方式

使得土壤侵蚀强度大大降低。

Abstract

Cultivated slopes are the major soil loss area and the major river sediment source in the Three Gorges Reservoir region. However

reliable studies of soil erosion and sedimentation in the region are limited and the fundamental research on soil erosion is inefficient. A study was carried out to investigate soil erosion on a cultivated slope in the region using 137Cs technique. Preliminary results showed that the 137 Cs reference inventory of the study catchment was estimated to be 1 420.9 Bq/ m2. The 137 Cs inventories of gentle cultivated slope with a mean degree of 11.4°ranged between 398.5 and 1649.6 Bq/ m2 and the average value of slopelengt weighted was 816.0 Bq/ m2. Soil erosion rate on the cultivated slope was estimated by revised simplified mass balance model. Soil erosion rate on he study slope ranged between - 3358.8 and 4937.4 t/(km2·a) and the average value of slope length weighted was 1 294. 6 t/ (km2·a) . Influenced by the tillage

soil erosion rates in two slope segments decreased downslope and deposition occurred at the bottom of slope. The lower soil erosion rate is because the cultivated slope has a gentle gradient. On the other hand

a series of tillage method are adopted by the local farmers for preventing soil and water loss efficiently

which greatly reduces soil erosion.

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Erosion Rate of Purple Soil on a Cultivated Slope in the Three Gorges Reservoir Region Using 137Cs Technique

DOI：

摘要

Abstract

关键词

Keywords

references

Erosion Rate of Purple Soil on a Cultivated Slope in the Three Gorges Reservoir Region Using ¹³⁷Cs Technique