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

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.

https://doi.org/10.5194/bg-20-3093-2023

Article de revue ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total

Prévisualisation

Version publiée - Anglais
Sous licence

.
607711.pdf
Télécharger (2MB) | Prévisualisation

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