[1]GAO Feng,HUA Cui,LU Yuan,et al.Research on Spatial Distribution Characteristics of Soil Erosion Intensity Based on Terrain Gradient—A Case Study in Qinjiang Watershed[J].Research of Soil and Water Conservation,2014,21(02):22-26.
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Research on Spatial Distribution Characteristics of Soil Erosion Intensity Based on Terrain Gradient—A Case Study in Qinjiang Watershed
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
21
Number of periods:
2014 02
Page number:
22-26
Column:
Public date:
2014-04-28
- Title:
- Research on Spatial Distribution Characteristics of Soil Erosion Intensity Based on Terrain Gradient—A Case Study in Qinjiang Watershed
- CLC:
- S157
- DOI:
- -
- Abstract:
- Terrain is not only one of the important factors affecting the spatial distribution pattern of soil erosion, but also a prerequisite for soil erosion assessment and land evaluation. A good understanding of the relationships between soil erosion intensity class and terrain gradient is essential for soil and water conservation planning. In this paper, elevation, slope, and terrain niche were conceptually divided into 13 classes, which were used to describe the terrain difference across the study area, Qinjiang watershed in Guangxi. The nondimensional distribution index was used to examine characteristics of soil erosion intensity. Using DEM and other materials from field survey based on the spatial statistic analysis module in ArcGIS 10.1, the distribution pattern of soil erosion intensity and their relationships with terrain factors in the study area were revealed by analyzing the nondimensional distribution index for different soil erosion intensity classes on varying terrain gradients. Results showed that: (1) moderate erosion, intensive erosion, extremely strong erosion, and severe erosion distributed mainly on the 1～2 terrain gradients at the elevation and slope gradients. The distribution index of mild erosion occupies a dominant position on the 1 terrain gradients at the terrain niche gradients, whereas the micro erosion in the elevation and slope gradients shows an opposed trend; (2) comparing the three methods, the terrain niche was found to be able to explicitly show distribution trends of soil erosion intensity with variations in terrain, and the terrain niche index seems to be more effective to reflect distribution characteristics of soil erosion intensity in that the terrain niche synthesizes information of both elevation and slope; (3) this study provides a feasible quantitative method for the spatial pattern of soil erosion intensity and soil and water conservation planning.
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