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

作者：Mingkai Jiang, Belinda E. Medlyn, David Wårlind, Jürgen Knauer, Katrin Fleischer, Daniel Sebastian Goll, Stefan Olin, Xiaojuan Yang, Lin Yu, Sönke Zaehle, Haicheng Zhang, He Lv, Kristine Y. Crous, Yolima Carrillo, Catriona A. Macdonald, Ian C. Anderson, Matthias M. Boer, Mark Farrell, Andrew N. Gherlenda, Laura Castañeda‐Gómez, Shun Hasegawa, Klaus Jarosch, Paul J. Milham, Raúl Ochoa‐Hueso, Varsha Shankar Pathare, Johanna Pihlblad, J. Piñeiro, Jeff R. Powell, Sally A. Power, Peter B. Reich, Markus Riegler, David S. Ellsworth, Benjamin Smith · 发表于：Science Advances · 年份：2024 · DOI：10.1126/sciadv.adl5822 · 被引用次数：25 · 研究领域：Plant Water Relations and Carbon Dynamics、Soil Carbon and Nitrogen Dynamics、Plant responses to elevated CO2

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.