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ISRN Soil Science
Volume 2013 (2013), Article ID 256352, 8 pages
http://dx.doi.org/10.1155/2013/256352
Research Article

Spatiotemporal Changes of Rainfall Erosivity in Loess Plateau, China

1Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan
2Desertification Research Institute, National Center for Research, Khartoum 11111, Sudan
3College of Hydraulic and Architecture of North East Agricultural University, Harbin 150030, China
4Department of Civil Engineering, Indian Institute of Technology, Roorkee 247667, India
5Remote Sensing Authority, National center for Research, Khartoum 11111, Sudan

Received 16 January 2013; Accepted 6 February 2013

Academic Editors: J. Artiola, L. A. Dawson, W. Ding, and W. R. Roy

Copyright © 2013 Mohamed A. M. Abd Elbasit et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The reason for the severity of soil erosion in Loess Plateau can be attributed to three nonanthropogenic factors: rainfall erosivity, slope gradient, and loess soil. The rainfall erosivity is controlled by the rainfall characteristics. Generally, rainfall characteristics change drastically in space and time. The rainfall erosivity has been investigated using the modified Fournier index (MFI), annual rainfall, and precipitation concentration index (PCI). The study showed a decrease in average MFI by 10%. However, the difference between the MFI in 1960s and 1990s was found to decrease in a large area in Loess Plateau, whereas there was an increase in MFI at the high latitude. The maximum decrease in the rainfall erosivity was higher in the southeast than that in the north and west. The was found to have a trend similar to the MFI, which further indicates that the MFI follows, to a high extent, the annual rainfall trend. The PCI was found to have trend opposite to MFI and . The PCI increased in the north and west and decreased toward the southeast. The average temporal difference in the PCI between the 1960s, and 1990s was two percent.