Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees

Detalhes bibliográficos
Autor(a) principal: Bordron, B.
Data de Publicação: 2018
Outros Autores: Robin, A., Oliveira, I. R., Guillemot, J., Laclau, J. P. [UNESP], Jourdan, C., Nouvellon, Y., Abreu-Junior, C. H., Trivelin, P. C.O., Gonçalves, J. L.M., Plassard, C., Bouillet, J. P.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.foreco.2018.03.018
http://hdl.handle.net/11449/170821
Resumo: Functional specialization of fine roots was found for Eucalyptus grandis trees at harvesting age (6 years) on tropical soils. Aiming to elucidate whether functional specialization is a ubiquitous feature of eucalypts, we focused on its changes with ontogeny, tree nutrient status and soil depth. We studied the potential uptake of N, K and Ca by 2-year-old E. grandis trees, as a function of soil depth and NPK fertilization. We injected NO−3-15N, Rb+ (K+ analogue) and Sr2+ (Ca2+ analogue) tracers simultaneously in a solution at depths of 10, 50, 150 and 300 cm in a sandy Ferralsol soil. A complete randomized block design was set up with three replicates of paired trees per injection depth, in fertilized and non-fertilized plots. Recently expanded leaves were sampled at 70 days after tracer injection. Determination of foliar Rb, Sr concentrations and x(15N) allowed estimating the relative uptake potential (RUP) and the specific RUP (SRUP), defined as the ratio between RUP and fine root length density (RLD) in the corresponding soil layer. Various root traits were measured at each depth. Foliar N and K concentrations were higher in fertilized than in non-fertilized trees. The RUP of NO3 –-15N decreased sharply with soil depth and the highest values of the SRUP of NO3 –-15N were found at a depth of 50 cm. The RUP of Rb+ and Sr2+ did not change with soil depth, whilst the SRUP of Rb+ and Sr2+ were higher at the depth of 300 cm than in the topsoil, concomitant with an increase in root diameter and a decrease in root tissue density with depth. The SRUP of Rb+ and Sr2+ at a depth of 300 cm were on average 136 and 61% higher for fertilized trees than for non-fertilized trees, respectively. Fine roots of young E. grandis trees showed contrasting potential uptake rates with soil depth depending on the nutrient. Fertilization increased the uptake rate of Rb+ and Sr2+ by unit of root length in deep soil layers. Functional specialization of fine roots for cations of low mobility depending on depth previously shown at harvesting age also occurs in young E. grandis plantations and increases with fertilization application. This mechanism helps explaining very low amounts of cations lost by leaching in Eucalyptus plantations established in deep tropical soils, even in highly fertilized stands.
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spelling Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees15NDeep fine rootsNutrient uptake potentialRubidiumSandy tropical soilStrontiumFunctional specialization of fine roots was found for Eucalyptus grandis trees at harvesting age (6 years) on tropical soils. Aiming to elucidate whether functional specialization is a ubiquitous feature of eucalypts, we focused on its changes with ontogeny, tree nutrient status and soil depth. We studied the potential uptake of N, K and Ca by 2-year-old E. grandis trees, as a function of soil depth and NPK fertilization. We injected NO−3-15N, Rb+ (K+ analogue) and Sr2+ (Ca2+ analogue) tracers simultaneously in a solution at depths of 10, 50, 150 and 300 cm in a sandy Ferralsol soil. A complete randomized block design was set up with three replicates of paired trees per injection depth, in fertilized and non-fertilized plots. Recently expanded leaves were sampled at 70 days after tracer injection. Determination of foliar Rb, Sr concentrations and x(15N) allowed estimating the relative uptake potential (RUP) and the specific RUP (SRUP), defined as the ratio between RUP and fine root length density (RLD) in the corresponding soil layer. Various root traits were measured at each depth. Foliar N and K concentrations were higher in fertilized than in non-fertilized trees. The RUP of NO3 –-15N decreased sharply with soil depth and the highest values of the SRUP of NO3 –-15N were found at a depth of 50 cm. The RUP of Rb+ and Sr2+ did not change with soil depth, whilst the SRUP of Rb+ and Sr2+ were higher at the depth of 300 cm than in the topsoil, concomitant with an increase in root diameter and a decrease in root tissue density with depth. The SRUP of Rb+ and Sr2+ at a depth of 300 cm were on average 136 and 61% higher for fertilized trees than for non-fertilized trees, respectively. Fine roots of young E. grandis trees showed contrasting potential uptake rates with soil depth depending on the nutrient. Fertilization increased the uptake rate of Rb+ and Sr2+ by unit of root length in deep soil layers. Functional specialization of fine roots for cations of low mobility depending on depth previously shown at harvesting age also occurs in young E. grandis plantations and increases with fertilization application. This mechanism helps explaining very low amounts of cations lost by leaching in Eucalyptus plantations established in deep tropical soils, even in highly fertilized stands.USP-ESALQCIRAD UMR Eco&SolsEco&Sols Univ Montpellier CIRAD INRA IRD, Montpellier SupAgroUNESP Departamento de Solos e Recursos Ambientais Universidade Estadual Paulista ‘Júlio de Mesquita Filho’USP-CENAINRA CIRAD IRD Montpellier SupAgro University of Montpellier UMR Eco&SolsUNESP Departamento de Solos e Recursos Ambientais Universidade Estadual Paulista ‘Júlio de Mesquita Filho’Universidade de São Paulo (USP)UMR Eco&SolsIRDUniversidade Estadual Paulista (Unesp)Bordron, B.Robin, A.Oliveira, I. R.Guillemot, J.Laclau, J. P. [UNESP]Jourdan, C.Nouvellon, Y.Abreu-Junior, C. H.Trivelin, P. C.O.Gonçalves, J. L.M.Plassard, C.Bouillet, J. P.2018-12-11T16:52:33Z2018-12-11T16:52:33Z2018-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://dx.doi.org/10.1016/j.foreco.2018.03.018Forest Ecology and Management.0378-1127http://hdl.handle.net/11449/17082110.1016/j.foreco.2018.03.0182-s2.0-850443717242-s2.0-85044371724.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengForest Ecology and Management1,625info:eu-repo/semantics/openAccess2024-01-16T06:27:27Zoai:repositorio.unesp.br:11449/170821Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:08:01.450694Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
title Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
spellingShingle Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
Bordron, B.
15N
Deep fine roots
Nutrient uptake potential
Rubidium
Sandy tropical soil
Strontium
title_short Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
title_full Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
title_fullStr Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
title_full_unstemmed Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
title_sort Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
author Bordron, B.
author_facet Bordron, B.
Robin, A.
Oliveira, I. R.
Guillemot, J.
Laclau, J. P. [UNESP]
Jourdan, C.
Nouvellon, Y.
Abreu-Junior, C. H.
Trivelin, P. C.O.
Gonçalves, J. L.M.
Plassard, C.
Bouillet, J. P.
author_role author
author2 Robin, A.
Oliveira, I. R.
Guillemot, J.
Laclau, J. P. [UNESP]
Jourdan, C.
Nouvellon, Y.
Abreu-Junior, C. H.
Trivelin, P. C.O.
Gonçalves, J. L.M.
Plassard, C.
Bouillet, J. P.
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade de São Paulo (USP)
UMR Eco&Sols
IRD
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Bordron, B.
Robin, A.
Oliveira, I. R.
Guillemot, J.
Laclau, J. P. [UNESP]
Jourdan, C.
Nouvellon, Y.
Abreu-Junior, C. H.
Trivelin, P. C.O.
Gonçalves, J. L.M.
Plassard, C.
Bouillet, J. P.
dc.subject.por.fl_str_mv 15N
Deep fine roots
Nutrient uptake potential
Rubidium
Sandy tropical soil
Strontium
topic 15N
Deep fine roots
Nutrient uptake potential
Rubidium
Sandy tropical soil
Strontium
description Functional specialization of fine roots was found for Eucalyptus grandis trees at harvesting age (6 years) on tropical soils. Aiming to elucidate whether functional specialization is a ubiquitous feature of eucalypts, we focused on its changes with ontogeny, tree nutrient status and soil depth. We studied the potential uptake of N, K and Ca by 2-year-old E. grandis trees, as a function of soil depth and NPK fertilization. We injected NO−3-15N, Rb+ (K+ analogue) and Sr2+ (Ca2+ analogue) tracers simultaneously in a solution at depths of 10, 50, 150 and 300 cm in a sandy Ferralsol soil. A complete randomized block design was set up with three replicates of paired trees per injection depth, in fertilized and non-fertilized plots. Recently expanded leaves were sampled at 70 days after tracer injection. Determination of foliar Rb, Sr concentrations and x(15N) allowed estimating the relative uptake potential (RUP) and the specific RUP (SRUP), defined as the ratio between RUP and fine root length density (RLD) in the corresponding soil layer. Various root traits were measured at each depth. Foliar N and K concentrations were higher in fertilized than in non-fertilized trees. The RUP of NO3 –-15N decreased sharply with soil depth and the highest values of the SRUP of NO3 –-15N were found at a depth of 50 cm. The RUP of Rb+ and Sr2+ did not change with soil depth, whilst the SRUP of Rb+ and Sr2+ were higher at the depth of 300 cm than in the topsoil, concomitant with an increase in root diameter and a decrease in root tissue density with depth. The SRUP of Rb+ and Sr2+ at a depth of 300 cm were on average 136 and 61% higher for fertilized trees than for non-fertilized trees, respectively. Fine roots of young E. grandis trees showed contrasting potential uptake rates with soil depth depending on the nutrient. Fertilization increased the uptake rate of Rb+ and Sr2+ by unit of root length in deep soil layers. Functional specialization of fine roots for cations of low mobility depending on depth previously shown at harvesting age also occurs in young E. grandis plantations and increases with fertilization application. This mechanism helps explaining very low amounts of cations lost by leaching in Eucalyptus plantations established in deep tropical soils, even in highly fertilized stands.
publishDate 2018
dc.date.none.fl_str_mv 2018-12-11T16:52:33Z
2018-12-11T16:52:33Z
2018-01-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.foreco.2018.03.018
Forest Ecology and Management.
0378-1127
http://hdl.handle.net/11449/170821
10.1016/j.foreco.2018.03.018
2-s2.0-85044371724
2-s2.0-85044371724.pdf
url http://dx.doi.org/10.1016/j.foreco.2018.03.018
http://hdl.handle.net/11449/170821
identifier_str_mv Forest Ecology and Management.
0378-1127
10.1016/j.foreco.2018.03.018
2-s2.0-85044371724
2-s2.0-85044371724.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Forest Ecology and Management
1,625
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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