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Soil Organic Matter Pools and Their Associations with Carbon Mineralization Kinetics

^a Dep. de Suelos, Facultad de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453 (1417), Buenos Aires, Argentina

View larger version (26K): [in a new window]   Fig. 1 Relationships between the carbon mineralized in 160 d (mineralized C) with carbon in the different organic matter pools. Depths: • 0–5 cm, 5–10 cm, § 10–15 cm, 15–20 cm

View larger version (28K): [in a new window]   Fig. 2 Relationships between the fraction of the total carbon mineralized in 160 d and the fraction of the total carbon in the different soil organic matter fractions. Depths: • 0–5 cm, 5–10 cm, § 10–15 cm, 15–20 cm

View larger version (14K): [in a new window]   Fig. 3 Correlations between potentially mineralizable carbon pool (C0) and semidecomposition time (t1/2) estimated by the exponential and hyperbolic kinetic models. t1/2 for the exponential model was estimated as: 0.693/exponential k. Depths: • 0–5 cm, 5–10 cm, § 10–15 cm, 15–20 cm

View larger version (15K): [in a new window]   Fig. 4 Correlation between C0 of the exponential with the carbon mineralized in 160 d of incubation (mineralized C) and the light fraction C. Depths: • 0–5 cm, 5–10 cm, § 10–15 cm, 15–20 cm