Cornut Ivan, Delpierre Nicolas, Laclau Jean-Paul, Guillemot Joannès, Nouvellon Yann, Campoe Otavio, Stape Jose Luiz, Santos Vitoria Fernanda, Le Maire Guerric. 2023. 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. Biogeosciences, 20 (14) : 3093-3117.
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Résumé : The 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.
Mots-clés Agrovoc : cycle du carbone, modèle de simulation, Eucalyptus, Eucalyptus grandis, forêt tropicale, croissance, efficience d'utilisation de l'eau, photosynthèse, physiologie végétale, potassium, dépôt atmosphérique, feuille, plantation forestière, Fagus sylvatica
Mots-clés géographiques Agrovoc : Brésil
Mots-clés libres : Potassium, Eucalyptus, Modelling, Productivity, Carbon and water fluxes
Classification Agris : K01 - Foresterie - Considérations générales
F60 - Physiologie et biochimie végétale
U10 - Informatique, mathématiques et statistiques
Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques
Agences de financement hors UE : Agence Nationale de la Recherche
Projets sur financement : (FRA) CLAND : Changement climatique et usage des terres, (FRA) Modélisation pour l'accompagnement des acteurs, vers l'adaptation des couverts pérennes ou agroforestiers aux changements globaux, (FRA) Agricultural Sciences for sustainable Development
Auteurs et affiliations
- Cornut Ivan, CIRAD-PERSYST-UMR Eco&Sols (FRA) - auteur correspondant
- Delpierre Nicolas, CNRS (FRA)
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Laclau Jean-Paul, CIRAD-PERSYST-UMR Eco&Sols (FRA)
ORCID: 0000-0002-2506-214X
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Guillemot Joannès, CIRAD-PERSYST-UMR Eco&Sols (FRA)
ORCID: 0000-0003-4385-7656
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Nouvellon Yann, CIRAD-PERSYST-UMR Eco&Sols (FRA)
ORCID: 0000-0003-1920-3847
- Campoe Otavio, UFLA (BRA)
- Stape Jose Luiz, ESALQ (BRA)
- Santos Vitoria Fernanda, Suzano de Paper e Celulose (BRA)
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Le Maire Guerric, CIRAD-PERSYST-UMR Eco&Sols (FRA)
ORCID: 0000-0002-5227-958X
Source : Cirad-Agritrop (https://agritrop.cirad.fr/607711/)
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