Poorly crystalline minerals stabilize organic matter: I. Mineral properties and the resistance of organic matter against oxidative attack

摘要

Figure 5 shows a significant relation between hydroxyls released during NaF treatment and stable organic carbon for the nine non-andic soils. The NaF procedure (Perrott et al. 1976) seems to overestimate the amount of surface hydroxyls in soils with andic properties, probably as a result of mineral dissolution. Our results indicate that 1. poorly crystalline mineral phases stabilize organic carbon, 2. the abundance of reactive hydroxyls (surface site density) controls organic matter stabilization, 3. ligand exchange between organic functional groups and reactive surface sites is the most important stabilization mechanism in acid soils.