Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation
<p>Potassium (K) 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...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-07-01
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| Series: | Biogeosciences |
| Online Access: | https://bg.copernicus.org/articles/20/3119/2023/bg-20-3119-2023.pdf |
| _version_ | 1797768793571721216 |
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| author | I. Cornut I. Cornut I. Cornut G. le Maire G. le Maire J.-P. Laclau J.-P. Laclau J. Guillemot J. Guillemot J. Guillemot Y. Nouvellon Y. Nouvellon N. Delpierre N. Delpierre |
| author_facet | I. Cornut I. Cornut I. Cornut G. le Maire G. le Maire J.-P. Laclau J.-P. Laclau J. Guillemot J. Guillemot J. Guillemot Y. Nouvellon Y. Nouvellon N. Delpierre N. Delpierre |
| author_sort | I. Cornut |
| collection | DOAJ |
| description | <p>Potassium (K) 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 these in CASTANEA-MAESPA-K. Neither 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 limitation by K deficiency. Simulations also show that the response of net primary productivity (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 NPP or wood growth was not necessary to reproduce the observed decline of productivity under K limitation, suggesting that K stoichiometric plasticity could be different to 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 validation of the model at a larger scale and of this approach for developing decision-making tools to improve fertilisation practices.</p> |
| first_indexed | 2024-03-12T20:59:25Z |
| format | Article |
| id | doaj.art-d85e23c9d2e444a784b0420141fa0eb3 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-03-12T20:59:25Z |
| publishDate | 2023-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-d85e23c9d2e444a784b0420141fa0eb32023-07-31T10:07:28ZengCopernicus PublicationsBiogeosciences1726-41701726-41892023-07-01203119313510.5194/bg-20-3119-2023Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formationI. Cornut0I. Cornut1I. Cornut2G. le Maire3G. le Maire4J.-P. Laclau5J.-P. Laclau6J. Guillemot7J. Guillemot8J. Guillemot9Y. Nouvellon10Y. Nouvellon11N. Delpierre12N. Delpierre13Université Paris-Saclay, CNRS, AgroParisTech, Ecologie Systématique et Evolution, 91405, Orsay, FranceCIRAD, UMR Eco&Sols, 34398 Montpellier, FranceEco&Sols, Univ. Montpellier, CIRAD, INRAe, Institut Agro, IRD, Montpellier, FranceCIRAD, UMR Eco&Sols, 34398 Montpellier, FranceEco&Sols, Univ. Montpellier, CIRAD, INRAe, Institut Agro, IRD, Montpellier, FranceCIRAD, UMR Eco&Sols, 34398 Montpellier, FranceEco&Sols, Univ. Montpellier, CIRAD, INRAe, Institut Agro, IRD, Montpellier, FranceCIRAD, UMR Eco&Sols, 34398 Montpellier, FranceDepartment of Forest Sciences ESALQ, University of São Paulo, Piracicaba, São Paulo, BrazilEco&Sols, Univ. Montpellier, CIRAD, INRAe, Institut Agro, IRD, Montpellier, FranceCIRAD, UMR Eco&Sols, 34398 Montpellier, FranceEco&Sols, Univ. Montpellier, CIRAD, INRAe, Institut Agro, IRD, Montpellier, FranceUniversité Paris-Saclay, CNRS, AgroParisTech, Ecologie Systématique et Evolution, 91405, Orsay, FranceInstitut Universitaire de France (IUF), 75231, Paris, France<p>Potassium (K) 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 these in CASTANEA-MAESPA-K. Neither 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 limitation by K deficiency. Simulations also show that the response of net primary productivity (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 NPP or wood growth was not necessary to reproduce the observed decline of productivity under K limitation, suggesting that K stoichiometric plasticity could be different to 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 validation of the model at a larger scale and of this approach for developing decision-making tools to improve fertilisation practices.</p>https://bg.copernicus.org/articles/20/3119/2023/bg-20-3119-2023.pdf |
| spellingShingle | I. Cornut I. Cornut I. Cornut G. le Maire G. le Maire J.-P. Laclau J.-P. Laclau J. Guillemot J. Guillemot J. Guillemot Y. Nouvellon Y. Nouvellon N. Delpierre N. Delpierre Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation Biogeosciences |
| title | Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation |
| title_full | Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation |
| title_fullStr | Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation |
| title_full_unstemmed | Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation |
| title_short | Potassium limitation of forest productivity – Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation |
| title_sort | potassium limitation of forest productivity part 2 castanea maespa k shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation |
| url | https://bg.copernicus.org/articles/20/3119/2023/bg-20-3119-2023.pdf |
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