Spectroscopic characteristics of humic acids extracted from soils under different integrated agricultural production systems in tropical regions

Soil Organic Matter (SOM) plays an important in many ecosystems on the planet. Therefore, we employed elemental analysis (CHN), fluorescence spectroscopy (EEM-CP/PARAFAC), and electron paramagnetic resonance (EPR) to characterize the humic acids (HA) extracted from soils under integrated agricultura...

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Bibliographic Details
Published in:Geoderma Regional 2022-03, Vol.28, p.e00476, Article e00476
Main Authors: Tadini, Amanda M., Bernardi, Alberto C.C., Milori, Débora M.B.P., Oliveira, Patricia P.A., Pezzopane, José R.M., Martin-Neto, Ladislau
Format: Article
Language:English
Subjects:
Electron paramagnetic resonance
Fluorescence spectroscopy
Humic acid
Oxisol
Soil organic matter
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Summary:Soil Organic Matter (SOM) plays an important in many ecosystems on the planet. Therefore, we employed elemental analysis (CHN), fluorescence spectroscopy (EEM-CP/PARAFAC), and electron paramagnetic resonance (EPR) to characterize the humic acids (HA) extracted from soils under integrated agricultural production systems (e.g. agroforestry systems (AFS)). These systems (S) included Crop (C), Livestock (L), Forest (F), and different combinations of them (CLFS, LFS, and CLS), which were compared with pastures (intensive (INT) and extensive (EXT)) and native forest (NF). For this purpose, we collected samples of a dystrophic Red-Yellow Latosol from experimental field areas which it is located at the Embrapa Pecuária Sudeste in São Carlos, São Paulo state, Brazil. Results showed that the HA humification index increased with soil depth, which is identified by complex structures more affluent in semiquinone-type free radical (SFR) and higher fluorescence intensity, especially in the AFS. Therefore, the HA from the CLFS systems had a higher aromaticity profile than HA from pastures and native forest areas, suggesting a longer lifetime to Carbon compounds. These significant findings are important for developing climate change mitigation strategies. [Display omitted] •Organic matter from Integrated systems increase aromatic character than others areas;•Humic acids increase aromatic groups rich in semiquinone-type free radical to depth;•Humic acids from Integrated systems have higher stability and lifetime compounds in the soil;
ISSN:2352-0094
2352-0094
DOI:10.1016/j.geodrs.2021.e00476