Inp

Slow Soil C

microbial walls, metabolic, aggregate - clay

Passive Soil C

humics clay-protected

(0.000019)

FIGURE 16.6 The Century model showing lignin and N controls on the proportion of plant residue structural and metabolic components. Carbon flows entering microbial biomass and three soil components are controlled by decomposition rates (day_') shown in brackets. Microbial utilization efficiencies are shown on CO2 loss arrows (with permission from Parton et al., 1994).

Slow Soil C

The silt and clay contents play major roles in protecting the slow C pool, while clay content controls formation of passive soil C.

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