Extended Data Fig. 8: Data–model intercomparison of some key carbon cycle parameters, under ambient (aCO₂) and elevated CO₂ (eCO₂).

Parameters include: a, allocation coefficients to leaf, wood, root and other; b, turnover rates of leaf, root, aboveground litter (Aglit), belowground litter (Bglit); and c, turnover rate of soil. Models include: Community Atmosphere Biosphere Land Exchange (CABL), Community Land Model 4 (CLM4), Community Land Model with a phosphorus component (CLMP), Generic Decomposition And Yield (GDAY), Lund-Potsdam-Jena General Ecosystem Simulator (LPJX), Orchidee-C-N (OCNX) and Sheffield Dynamic Global Vegetation Model (SDVM). The model output was generated as part of the model ensemble predictions made in advance of the experiment reported in ref. ¹⁷ for EucFACE. Database uncertainties were estimated using the MCMC data assimilation algorithm, with error bars indicating one standard deviation. Allocation to ‘Other’ in the data refers to the allocation to mycorrhizal production, whereas in some models it refers to the allocation to reproductive carbon pool.