Increased hydraulic constraints in Eucalyptus plantations fertilized with potassium

dc.contributor.authorGuillemot, Joannès
dc.contributor.authorAsensio, Verónica
dc.contributor.authorBordron, Bruno
dc.contributor.authorNouvellon, Yann
dc.contributor.authorle Maire, Guerric
dc.contributor.authorBouillet, Jean-Pierre
dc.contributor.authorDomec, Jean-Christophe
dc.contributor.authorDelgado Rojas, Juan Sinforiano
dc.contributor.authorAbreu-Junior, Cassio Hamilton
dc.contributor.authorBattie-Laclau, Patricia
dc.contributor.authorCornut, Ivan
dc.contributor.authorGermon, Amandine [UNESP]
dc.contributor.authorDe Moraes Gonçalves, José Leonardo
dc.contributor.authorRobin, Agnès [UNESP]
dc.contributor.authorLaclau, Jean-Paul
dc.contributor.institutionUMR Eco&Sols
dc.contributor.institutionMontpellier SupAgro
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionEdafotec SL
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUMR INRAe-ISPA 1391
dc.contributor.institutionDuke University
dc.contributor.institutionUniversité Paris-Saclay
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.description.abstractFertilization is commonly used to increase growth in forest plantations, but it may also affect tree water relations and responses to drought. Here, we measured changes in biomass, transpiration, sapwood-to-leaf area ratio (As:Al) and sap flow driving force (ΔΨ) during the 6-year rotation of tropical plantations of Eucalyptus grandis under controlled conditions for throughfall and potassium (K) fertilization. K fertilization increased final tree height by 8 m. Throughfall exclusion scarcely affected tree functioning because of deep soil water uptake. Tree growth increased in K-supplied plots and remained stable in K-depleted plots as tree height increased, while growth per unit leaf area increased in all plots. Stand transpiration and hydraulic conductance standardized per leaf area increased with height in K-depleted plots, but remained stable or decreased in K-supplied plots. Greater Al in K-supplied plots increased the hydraulic constraints on water use. This involved a direct mechanism through halved As:Al in K-supplied plots relative to K-depleted plots, and an indirect mechanism through deteriorated water status in K-supplied plots, which prevented the increase in ΔΨ with tree height. K fertilization in tropical plantations reduces the hydraulic compensation to growth, which could increase the risk of drought-induced dieback under climate change.en
dc.description.affiliationCIRAD UMR Eco&Sols
dc.description.affiliationEco&Sols Univ Montpellier CIRAD INRAe IRD Montpellier SupAgro
dc.description.affiliationDepartment of Forest Sciences Universidade de São Paulo “Luiz de Queiroz” College of Agriculture (USP-ESALQ)
dc.description.affiliationCenter of Nuclear Energy in Agriculture Universidade de São Paulo (USP-CENA)
dc.description.affiliationEdafotec SL
dc.description.affiliationNIPE UNICAMP
dc.description.affiliationBordeaux Sciences Agro UMR INRAe-ISPA 1391
dc.description.affiliationNicholas School of the Environment Duke University
dc.description.affiliationEcologie Systématique Evolution Univ. Paris-Sud CNRS AgroParisTech Université Paris-Saclay
dc.description.affiliationSchool of Agricultural Sciences UNESP—São Paulo State University
dc.description.affiliationUnespSchool of Agricultural Sciences UNESP—São Paulo State University
dc.identifier.citationPlant Cell and Environment.
dc.relation.ispartofPlant Cell and Environment
dc.subjectEucalyptus grandis
dc.subjectHuber value
dc.subjecthydraulic conductance
dc.subjectpotassium fertilization
dc.subjecttree height
dc.subjecttropical forest plantation
dc.subjectwater potential
dc.subjectwater stress
dc.titleIncreased hydraulic constraints in Eucalyptus plantations fertilized with potassiumen