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• W2085393959 abstract "Abstract Molecular recalcitrance and organomineral interaction are factors that determine soil organic matter (SOM) stability. This study was based on a medium-term (5 years) experiment located in southern Brazil and aimed (i) at investigating the influence of native grassland and two no-till cropping systems [bare soil and fallow/maize + mucuna ( Stizolobium cinereum )—F/M + Mu] over the C and N contents in the whole soil down to 17.5 cm depth and in the particle-size fractions (> 150, 150–53, 53–20, 20–2, and − 1 clay) and (ii) at assessing the role of molecular recalcitrance and organomineral interaction in stabilizing SOM in this subtropical soil. Molecular recalcitrance of SOM was inferred through the concentration of semiquinone free radicals, as assessed by ESR (electron spin resonance) spectroscopy. Semiquinone radicals are supposed to derive from and be stabilized by recalcitrant aromatic structures and are also believed to relate to the recalcitrance imparted by disordered structural conformation of humic substances. Organomineral interaction was assessed through power saturation experiments of ESR spectroscopy. Compared to grassland, the legume-based F/M + Mu system increased the C and N stocks of the 0–17.5 cm layer at rates of 0.40 Mg C ha − 1 year − 1 and 0.06 Mg N ha − 1 year − 1 . Losses of 0.80 Mg C ha − 1 year − 1 and 0.02 Mg N ha − 1 year − 1 were observed in bare soil. Only the fine silt (20–2 μm) and clay ( − 1 ) and N (2.95 to 4.34 g N kg − 1 ) concentrations, and the lowest C:N ratios (10.1 to 11.6). The concentration of semiquinone free radicals in physical fractions increased in the order F/M + Mu" @default.
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• W2085393959 date "2006-08-01" @default.
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• W2085393959 title "C and N stocks and the role of molecular recalcitrance and organomineral interaction in stabilizing soil organic matter in a subtropical Acrisol managed under no-tillage" @default.
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• W2085393959 doi "https://doi.org/10.1016/j.geoderma.2005.07.012" @default.
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