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Modelling Hg mobility in podzols: Role of soil components and environmental implications

2020-05Journal article Open access
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dc.contributor.authorGomez-Armesto, Antia
dc.contributor.authorMartinez-Cortizas, Antonio
dc.contributor.authorFerro-Vázquez, Cruz
dc.contributor.authorMendez-Lopez, Melissa
dc.contributor.authorArias-Estevez, Manuel
dc.contributor.authorCarlos Novoa-Munoz, Juan
dc.date.accessioned2021-06-24T11:35:42Z
dc.date.available2021-06-24T11:35:42Z
dc.date.issued2020-05
dc.description.abstractA high-resolution soil sampling has been applied to two forest podzols (ACB-I and ACB-II) from SW Europe in order to investigate the soil components and processes influencing the content, accumulation and vertical distribution of Hg. Total Hg contents (THg) were 28.0 and 23.6 mu g kg(-1) in A horizons of ACB-I and ACB-II, then they strongly decreased in the E horizons and peaked in the Bhs horizons of both soils (55.3 and 63.0 mu g kg(-1)). THg decreased again in BwC horizons to 17.0 and 39.8 mu g kg(-1). The Bhs horizons accounted for 46 and 38% of the total Hg stored (ACB-I and ACB-II, respectively). Principal component analysis (PCA) and principal components regression (PCR), i.e. using the extracted components as predictors, allowed to distinguish the soil components that accounted for Hg accumulation in each horizon. The obtained model accurately predicted accumulated Hg (R-2 = 0.845) through four principal components (PCs). In A horizons, Hg distribution was controlled by fresh soil organic matter (PC4), whereas in E horizons the negative values of all PCs were consistent with the absence of components able to retain Hg and the corresponding very low THg concentrations. Maximum THg contents in Bhs horizons coincided with the highest peaks of reactive Fe and Al compounds (PC1 and PC2) and secondary crystalline minerals (PC3) in both soils. The THg distribution in the deepest horizons (Bw and BwC) seemed to be influenced by other pedogenetic processes than those operating in the upper part of the profile (A, E and Bhs horizons). Our findings confirm the importance of soils in the global Hg cycling, as they exhibit significant Hg pools in horizons below the uppermost O and A horizons, preventing its mobilization to other environmental compartments. (C) 2020 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipXunta de GaliciaXunta de GaliciaEuropean Commission [ED481A-2016/220]
dc.description.sponsorshipFPU of Ministerio de Educacion y Formacion ProfesionalGerman Research Foundation (DFG)National Health and Medical Research Council of Australia [FPU17/05484]
dc.description.sponsorshipConselleria de Cultura, Educacion e Ordenacion Universitaria (Xunta de Galicia)Xunta de Galicia [ED431C 2017/62-GRC, ED431F2018/06-EXCELENCIA, ED431E 2018/07]
dc.description.sponsorshipCITACA contract [08.CITACA-2019]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.envpol.2020.114040
dc.identifier.issn0269-7491
dc.identifier.urihttp://hdl.handle.net/10400.1/16513
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectHigh-resolution soil sampling
dc.subjectHg pools
dc.subjectPCA
dc.subjectRegression
dc.subjectPodzolization
dc.subject.otherEnvironmental Sciences & Ecology
dc.titleModelling Hg mobility in podzols: Role of soil components and environmental implications
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage114040
oaire.citation.titleEnvironmental Pollution
oaire.citation.volume260
person.familyNameFerro-Vázquez
person.givenNameCruz
person.identifierIXgucZ4AAAAJ&hl
person.identifier.ciencia-id5D16-F8ED-5275
person.identifier.orcid0000-0003-2793-1385
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublicationc974ceb3-0539-449f-9fef-9bc849364073
relation.isAuthorOfPublication.latestForDiscoveryc974ceb3-0539-449f-9fef-9bc849364073

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