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Fig. 4. Cumulative CO2–C respired during the course of a long-term laboratory incubation of soils at 25°C. An equation is fit to the data Ct = Cl (1 – e–klt) + krt, where Ct is the known cumulative amount of C respired at sampling period t, Cl is the size of the labile C pool, kl is the decay constant for the labile pool, and kr is the mineralization rate for the recalcitrant pool, which is set at 3 µg g–1 soil d–1. For this sample, Cl = 1544 kg ha–1, kl = 0.012 d–1.
