Digital soil erodibility mapping by soilscape trending and kriging

Pomar Avalos, Fabio Arnaldo and Naves Silva, Marx Leandro and Gomes Batista, Pedro Velloso and Pontes, Lucas Machado and de Oliveira, Marcelo Silva. (2018) Digital soil erodibility mapping by soilscape trending and kriging. Land Degradation & Development, 29 (9). pp. 3021-3028.

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Official URL: https://edoc.unibas.ch/79593/

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Spatial representation of soil erodibility (Universal Soil Loss Equation's [USLE] K factor) is critical for soil conservation and erosion modeling. K factor is directly linked to the soil properties, which have a spatially continuous and soilscape related variability. The objective of this study was to test a methodology to map the spatial distribution of soil erodibility in a 1,200 ha sub-basin making use of available spatial covariates and field data. The analysis was run for the Posses sub-basin, in southeast Brazil. The topsoil erodibility was calculated at 85 sampled locations. The spatial prediction of soil erodibility was performed using the scorpan approach, in which the trend term for kriging with external drift (KED) was modeled by soilscape covariates selected by multiple linear regression analysis. The results confirmed that relief data could produce feasible results for digital soil erodibility mapping, especially when combined with geostatistical procedures. A comparison with ordinary kriging showed better error statistics and decreased variance of the estimates for the KED model. This could affect significantly the uncertainty of further USLE applications. The best agreement between KED erodibility values and direct measurements of the K factor was observed for the Red-Yellow Argisol (Red-Yellow Ultisol), which is the dominant soil class in the sub-basin.
Faculties and Departments:05 Faculty of Science
05 Faculty of Science > Departement Umweltwissenschaften
05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften
05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Umweltgeowissenschaften (Alewell)
UniBasel Contributors:Batista, Pedro
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:09 Dec 2020 14:40
Deposited On:09 Dec 2020 14:40

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