Short-term temporal changes of bare soil CO2 fluxes after tillage described by first-order decay models
dc.contributor.author | La Scala, N. [UNESP] | |
dc.contributor.author | Lopes, A. [UNESP] | |
dc.contributor.author | Spokas, K. | |
dc.contributor.author | Archer, D. W. | |
dc.contributor.author | Reicosky, D. C. | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.contributor.institution | USDA ARS | |
dc.date.accessioned | 2014-05-20T13:14:29Z | |
dc.date.available | 2014-05-20T13:14:29Z | |
dc.date.issued | 2009-04-01 | |
dc.description.abstract | To further understand the impact of tillage on carbon dioxide (CO2) emission, we compare the performance of two conceptual models that describe CO2 emission after tillage as a function of the non-tilled emission plus a correction resulting from the tillage disturbance. The models assume that C in the readily decomposable organic matter follows a first-order reaction kinetics equation as dCsoil(t)/dt = -kC(soil)d(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) and k is the decay constant (time(-1)). Two possible relationships are derived between non-tilled (FNT) and tilled (F-T) soil fluxes F-T F-NT + a(1) e(-a2t) (model 1) and F-T a(3)F(NT) e(-a4t) (model 2), where t is time after tillage. The difference between these two models comes from an assumption related to the k factor of labile C in the tilled plot and its similarity to the k factor of labile C in the non-till plot. Statistical. t of experimental data to conceptual models showed good agreement between predicted and observed CO2 fluxes based on the index of agreement (d-index) and with model efficiency as large as 0.97. Comparisons reveal that model 2, where all C pools are assigned the same k factor, produces a better statistical. t than model 1. The advantage of this modelling approach is that temporal variability of tillage-induced emissions can be described by a simple analytical function that includes the non-tilled emission plus an exponential term, which is dependent upon tillage and environmental conditions. | en |
dc.description.affiliation | Univ Estadual Paulista, FCAV, BR-14884900 São Paulo, Brazil | |
dc.description.affiliation | USDA ARS, Soil & Water Management Unit, St Paul, MN 55108 USA | |
dc.description.affiliation | USDA ARS, No Great Plains Res Lab, Mandan, ND 58554 USA | |
dc.description.affiliation | USDA ARS, N Cent Soil Conservat Res Lab, Morris, MN 56267 USA | |
dc.description.affiliationUnesp | Univ Estadual Paulista, FCAV, BR-14884900 São Paulo, Brazil | |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
dc.description.sponsorship | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | |
dc.description.sponsorship | Universidade Estadual Paulista (UNESP) | |
dc.format.extent | 258-264 | |
dc.identifier | http://dx.doi.org/10.1111/j.1365-2389.2008.01102.x | |
dc.identifier.citation | European Journal of Soil Science. Malden: Wiley-blackwell, v. 60, n. 2, p. 258-264, 2009. | |
dc.identifier.doi | 10.1111/j.1365-2389.2008.01102.x | |
dc.identifier.issn | 1351-0754 | |
dc.identifier.lattes | 1449605928537533 | |
dc.identifier.lattes | 3690555450318734 | |
dc.identifier.uri | http://hdl.handle.net/11449/1942 | |
dc.identifier.wos | WOS:000264185300012 | |
dc.language.iso | eng | |
dc.publisher | Wiley-Blackwell | |
dc.relation.ispartof | European Journal of Soil Science | |
dc.relation.ispartofjcr | 2.644 | |
dc.relation.ispartofsjr | 1,440 | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Web of Science | |
dc.title | Short-term temporal changes of bare soil CO2 fluxes after tillage described by first-order decay models | en |
dc.type | Artigo | |
dcterms.license | http://olabout.wiley.com/WileyCDA/Section/id-406071.html | |
dcterms.rightsHolder | Wiley-blackwell | |
unesp.author.lattes | 1449605928537533 | |
unesp.author.lattes | 3690555450318734 [2] | |
unesp.author.orcid | 0000-0002-5049-5959[3] | |
unesp.author.orcid | 0000-0002-1575-9875[1] | |
unesp.author.orcid | 0000-0002-4816-7040[4] | |
unesp.campus | Universidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal | pt |
unesp.department | Ciências Exatas - FCAV | pt |
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