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dc.creatorBeretta-Blanco,Andrés
dc.creatorCarrasco-Letelier,Leonidas
dc.date2017-04-01
dc.date.accessioned2019-05-17T13:12:04Z
dc.date.available2019-05-17T13:12:04Z
dc.identifierhttps://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100011
dc.identifier.urihttps://revistaschilenas.uchile.cl/handle/2250/98266
dc.descriptionSoil erosion by rainfall is a process that demands management, both for the prevention of excessive soil erosion and for the protection of the quality of freshwater bodies. Erosion coefficients (K-factors) of the universal soil loss equation (USLE)/revised USLE (RUSLE) model were assigned to 99 mapped Uruguayan soil types at 1:1,000,000 scale. This work developed a linear mixed model (LMM) with 79 soils with assigned K-factors, in which the following variables were considered: soil taxonomy, chemical composition, and parent material. The developed LMM had an R²=0.86, in which the soil taxonomy (p<0.0001), parent material (p=0.0174), clay (p=0.0005) and sand (p=0.017) contents had significant statistical effects. The prediction capacity of this model was assessed with 10 soils not previously used in development of the LMM with assigned K-factors. The prediction assessment had an R²=0.84 and a mean error of 9.08% of the mean K-factor value. The LMM developed was used for the allocation of K-factors to soils mapped at a 1:20,000-resolution. Thus, the use of LMM increased the soil area with assigned K-factors from 111,822 km² (at a scale of 1:1,000,000) to 174,132 km² (1:20,000).
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dc.languageen
dc.publisherPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
dc.relation10.7764/rcia.v44i1.1622
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourceCiencia e investigación agraria v.44 n.1 2017
dc.subjectsoil classification
dc.subjectparent material
dc.subjectsoil texture
dc.subjectsoil chemistry
dc.titleUSLE/RUSLE K-factors allocated through a linear mixed model for Uruguayan soils


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