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Temperature dependences of light-saturated Rubisco carboxylation rate (VCmax) in Fagus sylvatica (A) and Picea abies (B) grown at ambient (AC) and elevated (EC) atmospheric CO2 concentration. The modified Arrhenius function (eqn 2) was fitted to the data. The individual measured values are shown; R2 ranged from 0·80 to 0·89 (P < 0·01). The vertical lines indicate modelled temperature optima of VCmax for AC and EC trees.
