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Erosión y desertificación.-Influence of land use changes on soil carbon stock and soil carbon erosion in a Mediterranean catchment

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dc.contributor.authorBoix-Fayos, Carolina
dc.contributor.authorMartínez-Mena, Maria
dc.contributor.authorde Vente, Joris
dc.contributor.authorAlbaladejo, Juan
dc.contributor.otherUniversidad de Murciaes
dc.date.accessioned2020-09-30T11:39:16Z
dc.date.available2020-09-30T11:39:16Z
dc.date.created2009-09
dc.description.abstractABSTRACT The effect of changing land uses on the organic soil carbon (C) stock and the soil C transported by water erosion and buried in depositional wedges behind check-dams was estimated in a Mediterranean catchment in SE Spain. The 57 % decrease in agricultural areas and 1.5-fold increase of the total forest cover between 1956 and 1997 induced an accumulation rate of total organic carbon (TOC) in the soil of 10.73 g m-2 yr-1. The mineralassociated organic carbon (MOC) represented the 70 % of the soil carbon pool, the particulate organic carbon (POC) represented a 30 % of the soil carbon pool. The average sediments/soil enrichment ratio at the subcatchment scale (8-125 ha) was 0.59 ±0.43 g kg-1. Eroded soil C accounted for between 2 % to 78 % of the soil C stock in the first 5 cm of the soil in the subcatchments. The C erosion rate varied between 0.008 and 0.2 t ha-1 yr-1. Observed changes in land use (decrease in agricultural areas) reduced soil C erosion, although sediments from non-agricultural sources are richer in organic C. At catchment scale from the 4 % of the soil C stock mobilized by water erosion, 77 % is buried in the sediment wedges behind check-dams. Soil C replacement due to increased vegetation cover between 1974 and 1997 represented a 36 % of the original soil organic C stock. All together represent an erosion-induced sink of soil organic C of 40 % compared to the original levels of 1974. We can conclude that the catchment is behaving as a soil C sink within the soil erosion subsystem as a consequence of the changes on the land use pattern that took place since the 1950’s. The meaning of this erosion-induced C sink in a wider C balance which takes into account soil respiration remains uncertaines
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dc.identifier.urihttp://hdl.handle.net/10201/96808
dc.languageenges
dc.relationSin financiación externa a la Universidades
dc.relation.ispartofCongreso Internacional sobre desertificaciónes
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectsoil C erosiones
dc.subjectland use changees
dc.subjectC stock.es
dc.subject.otherCDU::6 - Ciencias aplicadas::63 - Agricultura. Silvicultura. Zootecnia. Caza. Pesca::631 - Agricultura. Agronomía. Maquinaria agrícola. Suelos. Edafología agrícolaes
dc.titleErosión y desertificación.-Influence of land use changes on soil carbon stock and soil carbon erosion in a Mediterranean catchmentes
dc.typeinfo:eu-repo/semantics/otheres
dspace.entity.typePublicationes
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