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e., increased aromaticity and decreased alkyl CO-alkyl C ratio. However, differences of land use impact were observed in MOM-OC, e.g., overall decreased aromaticity and increased alkyl CO-alkyl C for all soils in NMR, and in DRIFT, it varied with soil type (aromaticity Ferralsol, Vertisol Luvisol, Solonetz). However, these trends were inconsistent and indistinct among fractions of four soils. Discrepancy in NMR and DRIFT results was ascribed to the sensitivity limitations of the two techniques in characterising soil OM in mineral