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Katsumi N, Yonebayashi K, Okazaki M. Effects of heating on composition, degree of darkness, and stacking nanostructure of soil humic acids. Sci Total Environ. 2015;541:23-32doi: 10.1016/j.scitotenv.2015.09.012.
Katsumi, N., Yonebayashi, K., & Okazaki, M. (2016). Effects of heating on composition, degree of darkness, and stacking nanostructure of soil humic acids. The Science of the total environment, 54123-32. https://doi.org/10.1016/j.scitotenv.2015.09.012
Katsumi, Naoya, et al. "Effects of heating on composition, degree of darkness, and stacking nanostructure of soil humic acids." The Science of the total environment vol. 541 (2016): 23-32. doi: https://doi.org/10.1016/j.scitotenv.2015.09.012
Katsumi N, Yonebayashi K, Okazaki M. Effects of heating on composition, degree of darkness, and stacking nanostructure of soil humic acids. Sci Total Environ. 2016 Jan 15;541:23-32. doi: 10.1016/j.scitotenv.2015.09.012. Epub 2015 Sep 19. PMID: 26398447.
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Sci Total Environ. 2016 Jan 15;541:23-32. doi: 10.1016/j.scitotenv.2015.09.012. Epub 2015 Sep 19.

Effects of heating on composition, degree of darkness, and stacking nanostructure of soil humic acids.

The Science of the total environment

Naoya Katsumi, Koyo Yonebayashi, Masanori Okazaki

Affiliations

  1. Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, 1-308 Suematsu, Nonoichi, Ishikawa 921-8836, Japan. Electronic address: [email protected].
  2. Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, 1-308 Suematsu, Nonoichi, Ishikawa 921-8836, Japan.

PMID: 26398447 DOI: 10.1016/j.scitotenv.2015.09.012

Abstract

Wildfires and prescribed burning can affect both the quality and the quantity of organic matter in soils. In this study, we investigated qualitative and quantitative changes of soil humic substances in two different soils (an Entisol from a paddy field and an Inceptisol from a cedar forest) under several controlled heating conditions. Soil samples were heated in a muffle furnace at 200, 250, or 300 °C for 1, 3, 5, or 12h. The humic acid and fulvic acid contents of the soil samples prior to and after heating were determined. The degree of darkness, elemental composition, carbon and nitrogen stable isotope ratios, (13)C nuclear magnetic resonance spectra, and X-ray diffraction patterns of humic acids extracted from the soils before and after heating were measured. The proportion of humic acids in total carbon decreased with increasing heating time at high temperature (300 °C), but increased with increasing heating time at ≤ 250 °C. The degree of darkness of the humic acids increased with increasing heating time and temperature. During darkening, the H/C atomic ratios, the proportion of aromatic C, and the carbon and nitrogen stable isotope ratios increased, whereas the proportions of alkyl C and O-alkyl C decreased. X-ray diffraction analysis verified that a stacking nanostructure developed by heating. Changes in the chemical structure of the humic acids from the heated soils depended on the type of soil. The major structural components of the humic acids from the heated Entisol were aromatic C and carboxylic C, whereas aliphatic C, aromatic C, and carboxylic C structural components were found in the humic acids from the heated Inceptisol. These results suggest that the heat-induced changes in the chemical structure of the humic acids depended on the source plant.

Copyright © 2015 Elsevier B.V. All rights reserved.

Keywords: Degree of darkness; Humic substances; Soil heating; Stacking nanostructure

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