Fig 2. C content of extracted mineral-associated SOM pools (WS = water soluble; OMC = organo-metal complexes; PCrys = poorly crystalline; Crys = crystalline and residual) for all horizons through depth (0–50 cm) in genetic horizons for the Young and Mature site.

Note that the water soluble SOM pool contribution to the total is often less than 1% in both Young and Mature forest soils, and is therefore not always visible in this graph.