Soil organic matter stabilization pathways in clay sub-fractions from a time series of fertilizer deprivation

The compound class distribution in the fine clay fraction related more closely to the NaF-reactive hydroxyl groups than that in the coarse clay fractions. Oxalate - extractable Fe (Feo) normalised to the surface area related to the compound class abundance in the coarse clay, but not in the fine clay. We interpret this as an indication of a relationship between mineral surface reactivity and organic matter composition.