Large-scale soil erosion modeling has a crucial role in the understanding and planning of soil and water conservation strategies. The lack of spatial data on soil characteristics required to compute the soil erodibility (K-factor) has been one of the greatest obstacles in Brazil. The K-factor is a complex property that expresses the susceptibility of soil to erode according to its inherent characteristics. This factor is a key input parameter for the most widely applied soil erosion models: the Universal Soil Loss Equation (USLE) and the Revised USLE (RUSLE). Here, we computed a high-resolution (250 m cell size) spatially explicit soil erodibility map across Brazil. To compute the K-factor, we applied the equations originally proposed in the USLE nomograph and EPIC, using the following soil properties, organic matter content, soil texture, soil structure, and permeability. To qualitatively evaluate our new K-factor map, its values were compared against standard K-factor values obtained from experimental plots across Brazil. We found that the USLE nomograph leads to a more precise estimation of the K-factor in Brazil than EPIC. The K-factor estimates by the USLE nomograph range from 0.0002 to 0.0636 t ha h ha−1 MJ−1 mm−1, with a mean value of 0.0181 t ha h ha−1 MJ−1 mm−1. Our findings pave the way for a better understanding of soil erosion across multiple scales and thereby contributing to better land-use planning and management in Brazil. The dataset is freely available at doi:https://doi.org/10.5281/zenodo.4279869

Godoi, R.D.F., Rodrigues, D.B.B., Borrelli, P., Oliveira, P.T.S. (2021). High-resolution soil erodibility map of Brazil. SCIENCE OF THE TOTAL ENVIRONMENT, 781, 146673 [10.1016/j.scitotenv.2021.146673].

High-resolution soil erodibility map of Brazil

Borrelli P.
Membro del Collaboration Group
;
2021

Abstract

Large-scale soil erosion modeling has a crucial role in the understanding and planning of soil and water conservation strategies. The lack of spatial data on soil characteristics required to compute the soil erodibility (K-factor) has been one of the greatest obstacles in Brazil. The K-factor is a complex property that expresses the susceptibility of soil to erode according to its inherent characteristics. This factor is a key input parameter for the most widely applied soil erosion models: the Universal Soil Loss Equation (USLE) and the Revised USLE (RUSLE). Here, we computed a high-resolution (250 m cell size) spatially explicit soil erodibility map across Brazil. To compute the K-factor, we applied the equations originally proposed in the USLE nomograph and EPIC, using the following soil properties, organic matter content, soil texture, soil structure, and permeability. To qualitatively evaluate our new K-factor map, its values were compared against standard K-factor values obtained from experimental plots across Brazil. We found that the USLE nomograph leads to a more precise estimation of the K-factor in Brazil than EPIC. The K-factor estimates by the USLE nomograph range from 0.0002 to 0.0636 t ha h ha−1 MJ−1 mm−1, with a mean value of 0.0181 t ha h ha−1 MJ−1 mm−1. Our findings pave the way for a better understanding of soil erosion across multiple scales and thereby contributing to better land-use planning and management in Brazil. The dataset is freely available at doi:https://doi.org/10.5281/zenodo.4279869
Godoi, R.D.F., Rodrigues, D.B.B., Borrelli, P., Oliveira, P.T.S. (2021). High-resolution soil erodibility map of Brazil. SCIENCE OF THE TOTAL ENVIRONMENT, 781, 146673 [10.1016/j.scitotenv.2021.146673].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/416231
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