Fig. 10. Mineralization of Al–organic matter precipitates (from dissolved organic matter solutions from the Oa and Oi horizons of a beech and a spruce forest) in dependence on the aromatic C content and the organic C/organic N ratio of the precipitates (multiple linear regression: R² = 0.76; dissolved organic carbon [DOC] mineralized [as a percentage of initial DOC] = 9.992 – 0.091(C/N ratio) – 0.161(aromatic C) [%]).