Distance from the trunk and depth of uptake of labelled nitrate for dominant and suppressed trees in Brazilian Eucalyptus plantations: Consequences for fertilization practices

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dc.contributor.authorPinheiro, Rafael Costa [UNESP]
dc.contributor.authorBouillet, Jean-Pierre
dc.contributor.authorBordron, Bruno
dc.contributor.authorAló, Lívia Lanzi [UNESP]
dc.contributor.authorCosta, Vladimir Eliodoro [UNESP]
dc.contributor.authorAlvares, Clayton Alcarde
dc.contributor.authorMeersche, Karel Van den
dc.contributor.authorStape, José Luiz
dc.contributor.authorGuerrini, Iraê Amaral [UNESP]
dc.contributor.authorLaclau, Jean-Paul [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUMR Eco&Sols
dc.contributor.institutionUniversity of Montpellier
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionSuzano SA Company
dc.date.accessioned2019-10-06T16:31:57Z
dc.date.available2019-10-06T16:31:57Z
dc.date.issued2019-09-01
dc.description.abstractClimate changes will increase the probability of drought, which is likely to dramatically increase tree mortality. The capacity of trees to withdraw water in deep soil layers is an important trait likely to account for tree survival over prolonged droughts. Our study aimed to gain insight into the maximum distance from the trunk where Eucalyptus fine roots take up water and mobile nutrients in deep sandy soils during dry periods. NO3 −-15N was injected in the soil at the end of the rainy season in commercial Eucalyptus stands planted with the same E. urophylla × E. grandis clone. The 15N tracer was applied in the middle of the inter-row (replicated in 3 plots): at 5 depths (from 0.1 to 6 m)at age 0.6 year, at 4 depths (from 0.1 to 9 m)at age 1.2 years, at 5 depths (from 0.1 to 12 m)at age 2.2 years, and at 6 depths (from 0.1 to 15 m)at age 6.4 years. δ15N was determined in leaves sampled in dominant and suppressed trees at different distances from each injection area, 4–5 months after NO3 −-15N injection (after the dry season). While dominant trees took up NO3 −-15N down to a depth of 6 m between 7 and 12 months after planting, the maximum depth of NO3 −-15N uptake for suppressed trees was between 3 and 4.5 m. From 1.5 to 6 years after planting, a foliar enrichment in 15N was mainly detected when the NO3 −-15N tracer was injected in the upper soil layers and only for a few trees at a depth of 6 m. Most of the uptake of 15N occurred within 2 m of horizontal distance from the injection site, whatever tree age and tree social status. Low amounts of NO3 −-15N were taken up for injection sites located between 2 m and 5 m from the trunk, and 15N uptake was never detected at horizontal distances greater than 6 m from the trunk. Eucalyptus fine roots can take up nitrates at depths between 6 and 8 m the first year after planting. However, the NO3 −-15N tracer injected at a depth of 6 m was only taken up by dominant trees and a 15N foliar enrichment of suppressed trees was only detected when the tracer was injected in the upper 3 m. Fertilizers must be applied within 2 m of the trunks in Eucalyptus plantations to be taken up by all trees, regardless of their social status. When fertilizations are concentrated the first months after planting in sandy soils, nutrient leaching in deep layers might increase the heterogeneity of the stands since mobile nutrients could only be taken up by dominant trees.en
dc.description.affiliationUniversidade Estadual Paulista (Unesp) Faculdade de Ciências Agronômicas
dc.description.affiliationCIRAD UMR Eco&Sols
dc.description.affiliationEco&Sols CIRAD INRA IRD Montpellier SupAgro University of Montpellier
dc.description.affiliationESALQ Universidade de São Paulo
dc.description.affiliationUniversidade Estadual Paulista (Unesp) Centro de Isótopos Estáveis
dc.description.affiliationSuzano SA Company
dc.description.affiliationUnespUniversidade Estadual Paulista (Unesp) Faculdade de Ciências Agronômicas
dc.description.affiliationUnespUniversidade Estadual Paulista (Unesp) Centro de Isótopos Estáveis
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2015/25946-0
dc.format.extent95-104
dc.identifierhttp://dx.doi.org/10.1016/j.foreco.2019.05.011
dc.identifier.citationForest Ecology and Management, v. 447, p. 95-104.
dc.identifier.doi10.1016/j.foreco.2019.05.011
dc.identifier.issn0378-1127
dc.identifier.scopus2-s2.0-85066240310
dc.identifier.urihttp://hdl.handle.net/11449/189169
dc.language.isoeng
dc.relation.ispartofForest Ecology and Management
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subject15N
dc.subjectBrazil
dc.subjectEucalypt plantations
dc.subjectFine roots
dc.subjectNutrient uptake
dc.subjectWater uptake
dc.titleDistance from the trunk and depth of uptake of labelled nitrate for dominant and suppressed trees in Brazilian Eucalyptus plantations: Consequences for fertilization practicesen
dc.typeArtigo

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