Assessment of spatial distribution of soil erodibility in Khoor and Biabanak Regions

Document Type : Research Article


1 PhD Student, Department of Desert Engineering, Faculty of Natural Resources and Geosciences, University of Kashan, Kashan, Iran

2 Assistant Professor, Department of Geography and Ecotourism, Faculty of Natural Resources and Geosciences, University of Kashan, Kashan, Iran

3 Associate Professor, Department of Desert Engineering, Faculty of Natural Resources and Geosciences, University of Kashan, Kashan, Iran

4 Associate Professor, Department of Renewable Energies and Environment, University of Tehran, Tehran, Iran


Currently, erosion is one of the most important environmental problems in Iran watersheds. Therefore, determination of the sediment and soil erodibility is very important for conservation and management of natural resources. The current study aims to evaluate the spatial distribution of soil erodibility and its relationship with some of the soil properties using geostatistical methods in the Khoor and Biabanak regions. For this purpose, 33 soil samples were taken from depths of 0-50 cm along three transects from playa to mountain units for determination of the components of sand, clay, silt, organic carbon and organic matter. Values of K factor and SEI were calculated using the values of these parameters. Finally, to determine the spatial distribution, interpolation methods were tested and the most suitable method was chosen. The results showed that Radial Basis Function was the most suitable of interpolation methods for the spatial distribution of the elements of sand, clay and K factor with RMSE 3.27, 3.22 and 0.0036, respectively. The simple Kriging method was suitable for carbon components and organic material with RMSE 0.34 and 0.59, respectively. For silt, Kriging Ordinary with RMSE 0.88, and for SEI index, Universal Kriging method with RMSE 0.0014 were suitable. According to the results of soil erodibility values, minimum and maximum amounts of K factor with 0.025 and 0.07 t h MJ− 1 mm− 1, as well as minimum and maximum values of SEI with 0.03 and 0.07 are extensive in the East, West and North West areas, respectively.


Main Subjects

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Volume 4, Issue 2
June 2017
Pages 561-571
  • Receive Date: 30 December 2016
  • Revise Date: 11 March 2017
  • Accept Date: 15 March 2017
  • First Publish Date: 22 June 2017
  • Publish Date: 22 June 2017