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Article Dans Une Revue Science Advances Année : 2024

Carbon-phosphorus cycle models overestimate CO 2 enrichment response in a mature Eucalyptus forest

Mingkai Jiang
Belinda Medlyn
David Wårlind
Jürgen Knauer
Katrin Fleischer
Stefan Olin
Xiaojuan Yang
  • Fonction : Auteur
Lin Yu
Sönke Zaehle
Haicheng Zhang
He Lv
Kristine Crous
Yolima Carrillo
Catriona Macdonald
Ian Anderson
Matthias Boer
Mark Farrell
Andrew Gherlenda
Laura Castañeda-Gómez
Shun Hasegawa
Klaus Jarosch
Paul Milham
Raúl Ochoa-Hueso
Varsha Pathare
Johanna Pihlblad
Juan Piñeiro Nevado
Jeff Powell
Sally Power
Peter Reich
Markus Riegler
David Ellsworth
Benjamin Smith

Résumé

The importance of phosphorus (P) in regulating ecosystem responses to climate change has fostered P-cycle implementation in land surface models, but their CO 2 effects predictions have not been evaluated against measurements. Here, we perform a data-driven model evaluation where simulations of eight widely used P-enabled models were confronted with observations from a long-term free-air CO 2 enrichment experiment in a mature, P-limited Eucalyptus forest. We show that most models predicted the correct sign and magnitude of the CO 2 effect on ecosystem carbon (C) sequestration, but they generally overestimated the effects on plant C uptake and growth. We identify leaf-to-canopy scaling of photosynthesis, plant tissue stoichiometry, plant belowground C allocation, and the subsequent consequences for plant-microbial interaction as key areas in which models of ecosystem C-P interaction can be improved. Together, this data-model intercomparison reveals data-driven insights into the performance and functionality of P-enabled models and adds to the existing evidence that the global CO 2 -driven carbon sink is overestimated by models.
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Dates et versions

hal-04648184 , version 1 (15-07-2024)

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Mingkai Jiang, Belinda Medlyn, David Wårlind, Jürgen Knauer, Katrin Fleischer, et al.. Carbon-phosphorus cycle models overestimate CO 2 enrichment response in a mature Eucalyptus forest. Science Advances , 2024, 10 (27), ⟨10.1126/sciadv.adl5822⟩. ⟨hal-04648184⟩
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