JOURNAL OF NATURAL RESOURCES ›› 2012, Vol. ›› Issue (7): 1164-1175.doi: 10.11849/zrzyxb.2012.07.008

• Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS • Previous Articles     Next Articles

Soil Erosion Changes in the Yanhe Watershed from 2001 to 2010 Based on RUSLE Model

LI Tian-hong1,2, ZHENG Li-na1,2   

  1. 1. The Key Laboratory for Environmental and Urban Sciences, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;
    2. College of Environmental Sciences, The Key Laboratory for Water and Sediment Sciences, Peking University, Beijing 100871, China
  • Received:2011-08-12 Revised:2011-12-12 Online:2012-07-20 Published:2012-07-20

Abstract: Soil erosion has become a worldwide environmental problem because it could threaten soil structure, agricultural production, water quality, and so on. During the past decade, much effort has been made to control soil erosion in the Loess Plateau, thus the distribution of soil erosion intensity in this region has experienced a great change. So it is necessary to take more effective soil and water conservation measures and realize the sustainable utilization of water resource by knowing soil erosion changes. Based on RUSLE model, soil erosion changes from 2001 to 2010 in the Yanhe Watershed, a typical hilly-gully region on the Loess Plateau, were studied with the support of GIS and RS. The data set used in the model includes monthly precipitation, MODIS NDVI data, DEM, land use and soil type maps. Having localized the coefficients in RUSLE, the gauged data from Xingzihe Hydrological Station was used to verify the model and the proved reasonable results were produced with this model. The annual soil erosion modulus and the temporal and spatial change of soil erosion intensity in the Yanhe Watershed were analyzed. The main conclusions are as follows: Firstly, in the period 2001-2010, soil erosion in the Yanhe Watershed experienced a decreasing trend from the maximal value of 6596.72 t/(km2穉) in 2001 to the minimal value of 2485.46 t/(km2穉) in 2008, decreased by 62.32%; the soil erosion modulus increased obviously in 2009 because of heavy rainfall. Secondly, the distribution of soil erosion intensity changed obviously and the area ratio of intense, extremely intense, and most intense soil erosion decreased from 16.21%, 21.93% and 12.36% to 10.85%, 4.58% and 0.39% respectively. Thirdly, the transformation matrix of soil erosion intensity indicated that the soil erosion intensity transformed from high level to low level in most of the area with 31.68% of the total area of the watershed from 2001 to 2005 and 42.13% from 2005 to 2010. The distribution pattern of soil erosion intensity during the past decade revealed in this study could provide support for soil and water conservation and ecological environmental construction in the study area and even in the similar watersheds of the Loess Plateau.

Key words: soil erosion, the Yanhe Watershed, RUSLE, MODIS NDVI

CLC Number: 

  • S157.1