Potassium limitation of forest productivity - Part 1: A mechanistic model simulating the effects of potassium availability on canopy carbon and water fluxes in tropical eucalypt stands

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Autor(es): dc.contributorEcologie Systématique et Evolution-
Autor(es): dc.contributorUmr Eco&Sols-
Autor(es): dc.contributorInstitut Universitaire de France (IUF)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorIrd-
Autor(es): dc.contributorUniversidade Federal de Lavras (UFLA)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorSuzano Papel e Celulose-
Autor(es): dc.creatorCornut, Ivan-
Autor(es): dc.creatorDelpierre, Nicolas-
Autor(es): dc.creatorLaclau, Jean-Paul-
Autor(es): dc.creatorGuillemot, Joannès-
Autor(es): dc.creatorNouvellon, Yann-
Autor(es): dc.creatorCampoe, Otavio-
Autor(es): dc.creatorStape, Jose Luiz-
Autor(es): dc.creatorFernanda Santos, Vitoria-
Autor(es): dc.creatorLe Maire, Guerric-
Data de aceite: dc.date.accessioned2025-08-21T15:42:25Z-
Data de disponibilização: dc.date.available2025-08-21T15:42:25Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-07-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.5194/bg-20-3093-2023-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/308728-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/308728-
Descrição: dc.descriptionThe extent of the potassium (K) limitation of forest productivity is probably more widespread than previously thought, and K limitation could influence the response of forests to future global changes. To understand the effects of K limitation on forest primary production, we have developed the first ecophysiological model simulating the K cycle and its interactions with the carbon (C) and water cycles. We focused on the limitation of the gross primary productivity (GPP) by K availability in tropical eucalypt plantations in Brazil. We used results from stand-scale fertilisation experiments as well as C flux measurements in two tropical eucalypt plantations to parameterise the model. The model was parameterised for fertilised conditions and then used to test for the effects of contrasting additions of K fertiliser. Simulations showed that K deficiency limits GPP by more than 50 % during a 6-year rotation, a value in agreement with estimations in K-limited eucalypt stands. Simulations showed a decrease of modelled canopy transpiration of around 50 % and a decrease in modelled water-use efficiency WUEGPP of 10 %. Through a sensitivity analysis, we used the model to identify the most critical processes to consider when studying K limitation of GPP. The inputs of K to the stands, such as the atmospheric deposition and weathering fluxes, and the regulation of the cycle of K within the ecosystem were critical for the response of the system to K deficiency. Litter leaching processes were of lower importance, since residence time of K in litter was low. The new forest K-cycle model developed in the present study includes multiple K processes interacting with the carbon and water cycles, and strong feedbacks on GPP were outlined. This is a first step in identifying the source or sink limitation of forest growth by K.-
Descrição: dc.descriptionUniversité Paris-Saclay Cnrs AgroParisTech Ecologie Systématique et Evolution-
Descrição: dc.descriptionCirad Umr Eco&Sols-
Descrição: dc.descriptionInstitut Universitaire de France (IUF)-
Descrição: dc.descriptionDepartment of Forest Sciences Esalq University of São Paulo, SP-
Descrição: dc.descriptionEco&Sols University of Montpellier Cirad INRAe Institut Agro Ird-
Descrição: dc.descriptionDepartmento de Ciências Florestais Universidade Federal de Lavras, MG-
Descrição: dc.descriptionDepartment of Forest Science São Paulo State University, SP-
Descrição: dc.descriptionSuzano Papel e Celulose, BA-
Descrição: dc.descriptionDepartment of Forest Science São Paulo State University, SP-
Formato: dc.format3093-3117-
Idioma: dc.languageen-
Relação: dc.relationBiogeosciences-
???dc.source???: dc.sourceScopus-
Título: dc.titlePotassium limitation of forest productivity - Part 1: A mechanistic model simulating the effects of potassium availability on canopy carbon and water fluxes in tropical eucalypt stands-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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