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The sensitivity of SOC (soil organic carbon) fractions can provide information on soil organic matter proxies and kinetically defined components related to their chemical composition and oxidability. The purpose of this study was to assess the stability of SOC on five soil types (Arenosols, Chernozems, Fluvisols, Vertisols and Solonetz) and three land uses (cropland, meadow and forest). To obtain SOC functional fractions chemical, physical and density fractionating methods were used as follows: SOC susceptible to oxidation with 333 mM KMnO 4  (SOC KMnO4S ), SOC with varying degrees of oxidation resistance by the modified Walkley-Black method (SOC wb1 , SOC wb2 , SOC wb3 , SOC wb4 ), particulate SOC (SOC par ); mineral-associated SOC (SOC mas ), aggregate-associated size classes of the SOC (SOC &gt;2000, SOC2000–250, SOC250–53, SOC &lt;53). The relative contribution of fractions in SOC was as follows: SOC KMnO4S  (7.9–42.5%), SOC wb1  (35.6%) &gt; SOC wb2  (27.5%) &gt; SOC wb4  (22.7%) &gt; SOC wb3  (14.2%), SOC mas  (56.6–76.4%) &gt; SOC par  (23.6–43.4%), SOC &gt;2000 (8.2–44.8), SOC 2000–250 (27.4–34.9), SOC 250–53 (13.4–27.4%), SOC &lt;53 (5.4–28.8%). Fractions SOC par , SOC wb4 , SOC &gt;2000 and SOC &lt;53 showed sensitivity to land use, whereas SOC mas , SOC  KMnO4S , SOC wb3  showed variations among soil types. The fraction SOCwb1 indicated sensitivity to both land use and soil type. Considering obtained functional fractions of SOC it was possible to determine discriminators between particular soil types or indicators of land use changes due the anthropogenization.

The Assessment of Soil Organic Carbon Pools in Different Soils Using Four Fractionation Methods