Iron oxides as proxies for characterizing anisotropy in soil CO2 emission in sugarcane areas under green harvest

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dc.contributor.authorRabelo de Souza Bahia, Angelica Santos [UNESP]
dc.contributor.authorMarques, Jose [UNESP]
dc.contributor.authorPanosso, Alan Rodrigo [UNESP]
dc.contributor.authorCamargo, Livia Arantes [UNESP]
dc.contributor.authorSiqueira, Diego Silva [UNESP]
dc.contributor.authorLa Scala, Newton [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-12-03T13:07:02Z
dc.date.available2014-12-03T13:07:02Z
dc.date.issued2014-07-01
dc.description.abstractSoil CO2 emission (FCO2) is a main contributor of atmospheric carbon transfer and is the subject of research aimed at developing effective methods for characterizing and mitigating CO2 emissions. The FCO2 is related to various soil properties including porosity, density and moisture, which are in turn related to gas transfer, O-2 uptake and CO2 release, as well as mineralogical components (particularly iron oxides, which are closely associated with aggregation and protection of soil organic matter). As estimated by diffuse reflectance spectroscopy (DRS), soil iron oxides such as hematite (Hm) and goethite (Gt) can be useful in determining FCO2. The main objective of this experiment was to assess the usefulness of the mineralogical properties Hm, Gt, and iron oxides extracted by dithionite-citrate-bicarbonate (Fe-d) to estimate the FCO2 in a sugarcane area under green harvest in southeastern Brazil. The experiment was conducted using an irregular 50 m x 50 m grid containing 89 sampling points 0.50-10 m apart to assess the soil properties. The FCO2 at each sampling point was measured at the beginning of crop growth and 54 days after planting with the use of two portable LI-COR LI-8100 Soil CO2 Flux Systems. The soil properties studied were found to be spatially dependent and exhibited well-defined anisotropy (particularly the mineralogical properties Hm, Gt and Fe-d). The first two components of a principal component analysis (PC1 and PC2) jointly accounted for 73.4% of the overall result variability with PC1 essentially related to the physical and mineralogical properties of the soil. Based on a multiple linear regression analysis, free water porosity (FWP) and Hm accounted for 71% of the FCO2 variability. Our results indicate that soil preparation and management practices in mechanically harvested sugarcane affect some factors inherent in the soil forming processes, including physical and mineralogical properties, which in turn affect FCO2. These results affirm the potential of DRS as an auxiliary tool for determination of properties that are typically associated with FCO2. In addition, the ensuing method allows for large-area FCO2 mapping to developing greenhouse gas emission inventories for agricultural soils. (C) 2014 Elsevier B.V. All rights reserved.en
dc.description.affiliationSao Paulo State Univ FCAV UNESP, Agr & Veterinarian Fac, BR-14883292 Jaboticabal, SP, Brazil
dc.description.affiliationSao Paulo State Univ FEIS UNESP, Ilha Solteira Engn Fac, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ FCAV UNESP, Agr & Veterinarian Fac, BR-14883292 Jaboticabal, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ FEIS UNESP, Ilha Solteira Engn Fac, BR-15385000 Ilha Solteira, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent152-162
dc.identifierhttp://dx.doi.org/10.1016/j.agee.2014.04.017
dc.identifier.citationAgriculture Ecosystems & Environment. Amsterdam: Elsevier Science Bv, v. 192, p. 152-162, 2014.
dc.identifier.doi10.1016/j.agee.2014.04.017
dc.identifier.issn0167-8809
dc.identifier.lattes1449605928537533
dc.identifier.urihttp://hdl.handle.net/11449/111188
dc.identifier.wosWOS:000338605000018
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofAgriculture Ecosystems & Environment
dc.relation.ispartofjcr3.541
dc.relation.ispartofsjr1,747
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectDiffuse reflectance spectroscopyen
dc.subjectSoil respirationen
dc.subjecthematiteen
dc.subjectgoethiteen
dc.subjectGeostatisticsen
dc.subjectMultivariate analysisen
dc.titleIron oxides as proxies for characterizing anisotropy in soil CO2 emission in sugarcane areas under green harvesten
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.lattes2134397589741043[3]
unesp.author.orcid0000-0001-9916-1696[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt

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