Short-term temporal changes of soil carbon losses after tillage described by a first-order decay model

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dc.contributor.authorLa Scala, N. [UNESP]
dc.contributor.authorLopes, A. [UNESP]
dc.contributor.authorSpokas, K.
dc.contributor.authorBolonhezi, D. [UNESP]
dc.contributor.authorArcher, D. W.
dc.contributor.authorReicosky, D. C.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUSDA ARS
dc.date.accessioned2014-05-20T13:14:29Z
dc.date.available2014-05-20T13:14:29Z
dc.date.issued2008-04-01
dc.description.abstractTillage stimulates soil carbon (C) losses by increasing aeration, changing temperature and moisture conditions, and thus favoring microbial decomposition. In addition, soil aggregate disruption by tillage exposes once protected organic matter to decomposition. We propose a model to explain carbon dioxide (CO2) emission after tillage as a function of the no-till emission plus a correction due to the tillage disturbance. The model assumes that C in the readily decomposable organic matter follows a first-order reaction kinetics equation as: dC(sail)(t)/dt = -kC(soil)(t) and that soil C-CO2 emission is proportional to the C decay rate in soil, where C-soil(t) is the available labile soil C (g m(-2)) at any time (t). Emissions are modeled in terms soil C available to decomposition in the tilled and non-tilled plots, and a relationship is derived between no-till (F-NT) and tilled (F-Gamma) fluxes, which is: F-T = a1F(NT)e(-a2t), where t is time after tillage. Predicted and observed fluxes showed good agreement based on determination coefficient (R-2), index of agreement and model efficiency, with R-2 as high as 0.97. The two parameters included in the model are related to the difference between the decay constant (k factor) of tilled and no-till plots (a(2)) and also to the amount of labile carbon added to the readily decomposable soil organic matter due to tillage (a,). These two parameters were estimated in the model ranging from 1.27 and 2.60 (a(1)) and - 1.52 x 10(-2) and 2.2 x 10(-2) day(-1) (a(2)). The advantage is that temporal variability of tillage-induced emissions can be described by only one analytical function that includes the no-till emission plus an exponential term modulated by tillage and environmentally dependent parameters. (C) 2008 Elsevier B.V. All rights reserved.en
dc.description.affiliationFCAV UNESP, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationUSDA ARS, N Cent Soil Conservat Res Lab, Morris, MN 56267 USA
dc.description.affiliationUSDA ARS, No Great Plains Res Lab, Mandan, ND 58554 USA
dc.description.affiliationUnespFCAV UNESP, BR-14884900 Jaboticabal, SP, Brazil
dc.format.extent108-118
dc.identifierhttp://dx.doi.org/10.1016/j.still.2008.01.006
dc.identifier.citationSoil & Tillage Research. Amsterdam: Elsevier B.V., v. 99, n. 1, p. 108-118, 2008.
dc.identifier.doi10.1016/j.still.2008.01.006
dc.identifier.issn0167-1987
dc.identifier.lattes1449605928537533
dc.identifier.lattes3690555450318734
dc.identifier.urihttp://hdl.handle.net/11449/1941
dc.identifier.wosWOS:000255663800009
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofSoil & Tillage Research
dc.relation.ispartofjcr3.824
dc.relation.ispartofsjr1,703
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectSoil respirationen
dc.subjectsoil tillageen
dc.subjectNo-tillen
dc.subjectsoil organic matteren
dc.subjectlabile carbon decayen
dc.subjectCO2 fluxen
dc.titleShort-term temporal changes of soil carbon losses after tillage described by a first-order decay modelen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes1449605928537533
unesp.author.lattes3690555450318734 [2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt
unesp.departmentCiências Exatas - FCAVpt

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Jaboticabal - FCAV - Faculdade de Ciências Agrárias e Veterinárias