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Respired CO2 (micrograms C grams Csoil−1 day−1) partitioned into >10 y C (pre-FACE) and <10 y C (FACE) using the 14C mixing model for Aspen (n = 3) and Duke (n = 4) elevated CO2 soils. Average fluxes from each pool are shown, and error bars are SEMs calculated from propagated error in the model. Inset shows parameters (±SEM) from regression of respiration flux on temperature by R = AebT.
