Assessing humification and organic C compounds by laser-induced fluorescence and FTIR spectroscopies under conventional and no-till management in Brazilian Oxisols

article i nfo Data on humification is important to assessing the rate and magnitude of soil carbon (C) sequestration. Thus, this study assessed the humification degree (HLIF) of soil organic matter (SOM) and the changes in functional C groups (aromatic-C and aliphatic-C) for contrasting land use and management practices (native vegetation (NV), conventional plow-based tillage (CT) and no-till (NT) systems) in sub-tropical and tropical Brazilian environments. Experiments were conducted at Ponta Grossa (PG) in Parana State and Lucas do Rio Verde (LRV) in Mato Grosso State of Brazil. Laser-induced fluorescence (LIFS) and Fourier-transform infrared (FTIR) spectroscopies, were used on whole soil samples to 1-m depth, and on seven aggregate size classes (8-19, 4-8, 2-4, 1-2, 0.5-1, 0.25-0.5, 0.053-0.25 mm) obtained by wet sieving of 0- 5a nd 5-10 cm layers. Three functional C groups were selected based on FTIR: aliphatic-C1 (1404 cm −1

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