Fig. 3 Correlations between potentially mineralizable carbon pool (C₀) and semidecomposition time (t_1/2) estimated by the exponential and hyperbolic kinetic models. t_1/2 for the exponential model was estimated as: 0.693/exponential k. Depths: • 0–5 cm, 5–10 cm, § 10–15 cm, 15–20 cm