Sediment composition for the assessment of water erosion and nonpoint source pollution in natural and fire-affected landscapes

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dc.catalogadorgjm
dc.contributor.authorCarkovic Aguilera, Athena B.
dc.contributor.authorPastén González, Pablo Arturo
dc.contributor.authorBonilla Meléndez, Carlos Alberto
dc.contributor.otherCEDEUS (Chile)
dc.date.accessioned2024-09-09T19:38:34Z
dc.date.available2024-09-09T19:38:34Z
dc.date.issued2015
dc.description.abstractWater erosion is a leading cause of soil degradation and a major nonpoint source pollution problem. Many efforts have been undertaken to estimate the amount and size distribution of the sediment leaving the field. Multi-size class water erosion models subdivide eroded soil into different sizes and estimate the aggregates composition based on empirical equations derived from agricultural soils. The objective of this study was to evaluate these equations on soil samples collected from natural landscapes (uncultivated) and fire-affected soils. Chemical, physical, and soil fractions and aggregate composition analyses were performed on samples collected in the Chilean Patagonia and later compared with the equations' estimates. The results showed that the empirical equations were not suitable for predicting the sediment fractions. Fine particles, including primary clay, primary silt, and small aggregates (<53 mu m) were over-estimated, and large aggregates (>53 mu m) and primary sand were under-estimated. The uncultivated and fire-affected soils showed a reduced fraction of fine particles in the sediment as clay and silt were mostly in the form of large aggregates. Thus, a new set of equations was developed for these soils, where small aggregates were defined as particles with sizes between 53 mu m and 250 mu m and large aggregates as particles >250 mu m. With r(2) values between 0.47 and 0.98, the new equations provided better estimates for primary sand and large aggregates. The aggregate's composition was also well predicted, especially the silt and clay fractions in the large aggregates from uncultivated soils (r(2) = 0.63 and 0.83, respectively) and the fractions of silt in the small aggregates (r(2) = 0.84) and clay in the large aggregates (r(2) = 0.78) from fire-affected soils. Overall, these new equations proved to be better predictors for the sediment and aggregate's composition in uncultivated and fire-affected soils, and they reduce the error when estimating soil loss in natural landscapes.
dc.fuente.origenConveris
dc.identifier.doi10.1016/j.scitotenv.2015.01.038
dc.identifier.issn0048-9697
dc.identifier.scopusid84921371431
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2015.01.038
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/87816
dc.identifier.wosidWOS:000351248500004
dc.information.autorucEscuela de Ingeniería; Carkovic Aguilera, Athena B.; S/I; 170682
dc.information.autorucEscuela de Ingeniería; Pastén González, Pablo Arturo; 0000-0002-9961-9342; 87432
dc.information.autorucEscuela de Ingeniería; Bonilla Meléndez, Carlos Alberto; S/I; 80465
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final35
dc.pagina.inicio26
dc.revistaScience of the Total Environment
dc.rightsacceso restringido
dc.subjectPatagonia
dc.subjectSediment composition
dc.subjectSoil aggregates
dc.subjectUncultivated soils
dc.subjectWater erosion
dc.subject.ddc620
dc.subject.deweyIngenieríaes_ES
dc.subject.ods06 Clean water and sanitation
dc.subject.odspa06 Agua limpia y saneamiento
dc.titleSediment composition for the assessment of water erosion and nonpoint source pollution in natural and fire-affected landscapes
dc.typeartículo
dc.volumen512-513
sipa.codpersvinculados170682
sipa.codpersvinculados87432
sipa.codpersvinculados80465
sipa.trazabilidadConveris;20-07-2021
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