Relationship Between Soil Erosion and Topographic Characters in Wujiang River Basin of Guizhou Province

WANG Yao; CAI Yun-long; PAN Mao

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Relationship Between Soil Erosion and Topographic Characters in Wujiang River Basin of Guizhou Province

- Relationship Between Soil Erosion and Topographic Characters in Wujiang River Basin of Guizhou Province
- Bulletin of Soiland Water Conservation Vol. 32, Issue 3, Pages: 7-12(2013)
- 作者机构：
  
  1. 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京,100871
  2. 国土资源部资源环境承载力评价重点实验室,北京,101149
  3. 北京大学城市与环境学院,北京,100871
- 作者简介：
- 基金信息：
- DOI：
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- Published：2013
- 稿件说明：
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WANG Yao, CAI Yun-long, PAN Mao. Relationship Between Soil Erosion and Topographic Characters in Wujiang River Basin of Guizhou Province[J]. Bulletin of Soiland Water Conservation, 2013, 32(3): 7-12.
DOI：

WANG Yao, CAI Yun-long, PAN Mao. Relationship Between Soil Erosion and Topographic Characters in Wujiang River Basin of Guizhou Province[J]. Bulletin of Soiland Water Conservation, 2013, 32(3): 7-12. DOI：

摘要

结合乌江流域2000年土壤侵蚀分布图和研究区30m分辨率的ASTER GDEM数据

对乌江流域土壤侵蚀在海拔高度、坡度、地表起伏度和粗糙度方面的空间分布特征进行研究。结果表明

贵州省乌江流域土壤侵蚀主要为水力侵蚀

包括微度、轻度、中度、强度和极强度侵蚀5种类型

以微度和轻度侵蚀为主。乌江流域微度和轻度土壤侵蚀空间分布的高程特征呈现单峰现象

中度以上侵蚀的高程特征呈双峰现象。流域中度及中度以下土壤侵蚀空间分布的坡度特征为单调下降趋势

强度和极强度土壤侵蚀的面积比例随着坡度的增加呈现先增大后减小的趋势

15°左右存在一个侵蚀临界坡度。乌江流域的土壤侵蚀随地形起伏度的增加表现为先增加后减小的趋势

存在7～16m临界起伏度;各类型土壤侵蚀随地表粗糙度的增加均呈减小趋势。喀斯特地区流域尺度侵蚀强度的变化受高程和坡度的影响较大

对地形起伏度和地表粗糙度的变化不敏感。

Abstract

The spatial correlation between soil erosion and the elevation

slope

amplitude and surface roughness is analyzed based on overlay analysis of soil erosion in 2000and DEM with a resolution of 30meters.Results show that the main type of erosion in Wujiang River basin is water erosion.According to the strength

the erosion can be divided into five levels which are minor

slight

moderate

high and extremely-high.The minor and slight levels of erosion are the dominated erosion.The minor andslight levels of erosion appear a single peak with the increasing elevation

while the moderate and the other beyond the moderate show obvious double peaks.The distribution of the moderate and other levels of erosion below it decreases with increasing slope.The ratio of high erosion area to extremely-high increases with the surface rolling at first

and then decreases

with 15°as a threshold.The erosion increases with the amplitude at first and decreases later

with a threshold of 7～16meters.The surface roughness is negatively correlated to soil erosion.The rougher the land surfaces

the lighter the soil erosion.Soil erosion in the karst area is not sensitive to amplitude and surface roughness

while it is largely affected by elevation and slope.

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