Earth Surface Processes

Evolution risk analysis of regional soil erosion: A case study of Jinghe River Basin

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  • 1. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
    2. Center for Hydrologic Cycle and Water Resources in Arid Region, Lanzhou University, Lanzhou 730000, China

Received date: 2010-08-18

  Revised date: 2010-11-06

  Online published: 2011-08-20

Abstract

Evolution risk of soil erosion is defined as a time changing relationship of soil erosion risk within a certain spatial extent, which is a dynamic evolution process of soil erosion possibility. It is important to evaluate the rationality and benefit of soil and water conservation measures with the notion of evolution risk of soil erosion on different temporal and spatial scales. The study took the Jinghe River Basin located in the center of the Chinese Loess Plateau as an example. Three space data of land use in 1986, 1995 and 2000 were considered. A notion of evolution risk factor and its calculation formula were presented to analyze the evolution risks of soil erosion (ERSE) over the 1986-2000 period in the Jinghe River Basin based on GIS technique, information theory and the Universal Soil Loss Equation. Results demonstrate that there is close relationship between the ERSR and the spatial distribution of rainfall erosivity factor. The ERSE shows an increasing trend firstly and then a decreasing one. The soil and water conservation measures for more than 20 years are effective in general. This study could offer a new tool to analyze regional ERSE.

Cite this article

LI Xun-gui, WEI Xia . Evolution risk analysis of regional soil erosion: A case study of Jinghe River Basin[J]. GEOGRAPHICAL RESEARCH, 2011 , 30(8) : 1361 -1369 . DOI: 10.11821/yj2011080002

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