Chemical structure of humic acids in biosolids-amended soils as revealed by NMR spectroscopy |
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| Institution: | 1. LBLGC-EA 1207, INRA USC1328, Orléans University, rue de Chartres, BP 6759, 45067 Orléans Cedex, France;2. Department of Bioscienze and Territorio, University of Molise, Contrada Fonte Lappone, 86090 Isernia, Italy;3. Polytech Orléans, Orléans University, 8 rue Léonard de Vinci, 45072 Orléans Cedex 2, France;4. ISTO, UMR 7327 CNRS/Orléans University, Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France;1. Dept. of Soil Science and Agri-Food Engineering, Paul-Comtois Bldg., Université Laval, Quebec City, QC G1K 7P4, Canada;2. Quebec Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Quebec City, QC G1V 2J3, Canada;3. Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, 1 Airport Rd., Swift Current, SK S9H 3X2, Canada;4. Centre de recherche en innovation sur les végétaux, Université Laval, Quebec City, QC G1V 0A6, Canada;1. Hunan International Scientific and Technological Cooperation Center for Agricultural Pollution Remediation and Wetland Protection, College of Resources and Environment, Hunan Agricultural University, Changsha, Hunan 410028, China;2. Hunan Institue of Agro-Environment and Ecology, Hunan Academy of Agricultural Sciences, Changsha 410125, China;3. School of Hydraulic Engineering, Engineering and Technical Center of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control, Changsha University of Science & Technology, Changsha 410114, China;4. Hunan Kaidi Engineering Technology Co., LTD, Changsha 410000, Hunan, China;1. Chair of Soil Science, Dept. of Ecology and Ecosystem Management, Munich University of Technology, Emil-Ramann-Str. 2, 85354 Freising, Germany;2. NSLS II, Brookhaven National Laboratory, Upton, NY, USA;3. Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA |
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| Abstract: | We used NMR spectroscopy to characterize humid acids extracted from soils that had received long-term application of 2 levels of biosolids to evaluate the soil organic matter (SOM) stability in biosolids-amended soils. The study also quantified fulvic acids (FAs), humic acids (HAs) and Fe/Al oxides. The soils were collected in 2004 from 7 fields, in Fulton County, southwestern Illinois, which received biosolids at a cumulative rate of 0 (control), 554 (low biosolids) and 1,066 (high biosolids) Mg ha−1. The application of biosolids increased both FA and HA contents, but biosolids-amended soil and control soil did not differ in FA/HA ratio. Biosolids application had no effect on water-soluble organic carbon content. Biosolids application increased the presence of Fe/Al in the SOM complex and lowered its C/Fe and C/Al ratios. 13C NMR spectra showed increased alkyl C and decreased aromatic C content in soil HAs with the application of biosolids, and the extent of such changes was higher with high than low biosolids treatment. Under biosolids application, the soil HAs’ C structure shifts from O-alkyl-dominant to alkyl-dominant. Biosolids application does not decrease SOM stability but rather increases the stability of soil humic substances. |
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