Preprints
https://doi.org/10.5194/egusphere-2022-884
https://doi.org/10.5194/egusphere-2022-884
09 Sep 2022
 | 09 Sep 2022

Potassium-limitation of forest productivity, part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation

Ivan Cornut, Guerric le Maire, Jean-Paul Laclau, Joannès Guillemot, Yann Nouvellon, and Nicolas Delpierre

Abstract. Potassium availability constrains forest productivity. Brazilian eucalypt plantations are a good example of the K-limitation of wood production. Here, we built upon a previously described model (CASTANEA-MAESPA-K) and used it to understand whether the simulated decline in C-source under K deficiency was sufficient to explain the K-limitation of wood productivity in Brazilian eucalypt plantations. We developed allocation schemes for both C and K and included into CASTANEA-MAESPA-K. No direct limitations of the C-sink activity, nor direct modifications of the C-allocation by K availability were included in the model. Simulation results show that the model was successful in replicating the observed patterns of wood productivity, growth, NPP limitation by K deficiency. Simulations also show that the response of NPP is not linear with increasing K fertilisation. Simulated stem carbon use and water use efficiencies decreased with decreasing levels of K availability. Simulating a direct stoichiometric limitation of wood productivity, growth, NPP was not necessary to reproduce the observed decline of productivity under K limitation, suggesting that K stoichiometric plasticity could be different than that of N and P. Confirming previous results from the literature, the model simulated an intense recirculation of K in the trees, suggesting that retranslocation processes were essential for tree functioning. Optimal K fertilisation levels calculated by the model were similar to nutritional recommendations currently applied in Brazilian eucalypt plantations, paving the way for validating the model at a larger scale and this approach to develop decision-making tools to improve fertilisation practices.

Journal article(s) based on this preprint

31 Jul 2023
Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation
Ivan Cornut, Guerric le Maire, Jean-Paul Laclau, Joannès Guillemot, Yann Nouvellon, and Nicolas Delpierre
Biogeosciences, 20, 3119–3135, https://doi.org/10.5194/bg-20-3119-2023,https://doi.org/10.5194/bg-20-3119-2023, 2023
Short summary

Ivan Cornut et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-884', Anonymous Referee #1, 19 Oct 2022
    • AC1: 'Reply on RC1', Ivan Cornut, 28 Dec 2022
  • RC2: 'Comment on egusphere-2022-884', Anonymous Referee #2, 31 Oct 2022
    • AC2: 'Reply on RC2', Ivan Cornut, 28 Dec 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-884', Anonymous Referee #1, 19 Oct 2022
    • AC1: 'Reply on RC1', Ivan Cornut, 28 Dec 2022
  • RC2: 'Comment on egusphere-2022-884', Anonymous Referee #2, 31 Oct 2022
    • AC2: 'Reply on RC2', Ivan Cornut, 28 Dec 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to minor revisions (review by editor) (02 Jan 2023) by Silvia Caldararu
ED: Reconsider after major revisions (03 Jan 2023) by Michael Bahn (Co-editor-in-chief)
AR by Ivan Cornut on behalf of the Authors (21 Feb 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (01 Mar 2023) by Silvia Caldararu
RR by Anonymous Referee #1 (27 Mar 2023)
ED: Publish subject to minor revisions (review by editor) (04 Apr 2023) by Silvia Caldararu
ED: Publish subject to minor revisions (review by editor) (14 Apr 2023) by Anja Rammig (Co-editor-in-chief)
AR by Ivan Cornut on behalf of the Authors (28 Apr 2023)  Author's response   Author's tracked changes 
EF by Daria Karpachova (30 Apr 2023)  Manuscript   Author's response   Author's tracked changes 
EF by Sarah Buchmann (02 May 2023)  Supplement 
ED: Publish as is (04 May 2023) by Silvia Caldararu
ED: Publish as is (10 May 2023) by Anja Rammig (Co-editor-in-chief)
AR by Ivan Cornut on behalf of the Authors (19 May 2023)  Manuscript 

Journal article(s) based on this preprint

31 Jul 2023
Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation
Ivan Cornut, Guerric le Maire, Jean-Paul Laclau, Joannès Guillemot, Yann Nouvellon, and Nicolas Delpierre
Biogeosciences, 20, 3119–3135, https://doi.org/10.5194/bg-20-3119-2023,https://doi.org/10.5194/bg-20-3119-2023, 2023
Short summary

Ivan Cornut et al.

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Latest update: 07 Oct 2023
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Short summary
After simulating the effects of low levels of Potassium on the canopy of trees and the uptake of carbon dioxide from the atmosphere by leaves in part 1, here we tried to simulate the way the trees use the carbon they have acquired and the interaction with the potassium cycle in the tree. We show that the effect of low potassium on the efficiency of the trees to acquire carbon is enought to exlplain why they do not produce enough wood when they are in soils with low levels of potassium.