Such models as the one depicted here are based on integrating soil aggregated dynamics and SOC kinetics, which provide the conceptual framework for modeling physicochemical processes in soil. Depicted are two classes of aggregates, macroaggregates (>250 ¼m) and microaggregates (53 to 250 ¼m), along with an unaggregated fraction of soil consisting of silt and clay particles and their interactions. Each aggregate contains two organic matter classes: particulate organic carbon (POC) and mineral associated organic carbon (MOC). Each of these organic compounds can be extracted directly from soil with a combination of sieving, density flotations, and chemical digestion.
Credit or Source: Office of Biological and Environmental Research of the U.S. Department of Energy Office of Science. science.energy.gov/ber/
U.S. DOE. 2008. Carbon Cycling and Biosequestration: Report from the March 2008 Workshop, DOE/SC-108, U.S. Department of Energy Office of Science. (p. 49) (website)