N mineralisation

Grass production

Pig. 3.3.11. A Flow chart of the CENTURY model to calculate the N and C turnover in an ecosystem using a grassland as an example. B Simulated changes in C, N and P content of various compartments. The model shows the magnitude of recycled substances in an ecosystem and also indicates the long-term accumulation of C and N in soil (Parton et al. 1988). C Dependence of soil carbon on ambient temperature and clay content of the soil. Adsorption of organic molecules to clay particles is a significant process that stabilises the soil carbon, thus the accumulation of carbon in a soil rises with increasing clay content. As the activity of soil microorganisms depends on the temperature, C accumulation in soil falls with mean annual temperature. (Schimel et al. 1994)

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