Biophysicochemical properties of the eroded southern chernozem (Trans-Ural Steppe, Russia) with emphasis on the 13C NMR spectroscopy of humic acids

Azamat Suleymanov, Vyacheslav Polyakov, Mikhail Komissarov, Ruslan Suleymanov, Ilyusya Gabbasova, Timur Garipov, Irik Saifullin and Evgeny Abakumov
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Azamat Suleymanov: Laboratory of Soil Science, Ufa Institute of Biology UFRC RAS, Ufa, Russia
Vyacheslav Polyakov: Department of Applied Ecology, Faculty of Biology, St. Petersburg State University, St. Petersburg, Russia
Mikhail Komissarov: Laboratory of Soil Science, Ufa Institute of Biology UFRC RAS, Ufa, Russia
Ruslan Suleymanov: Laboratory of Soil Science, Ufa Institute of Biology UFRC RAS, Ufa, Russia
Ilyusya Gabbasova: Laboratory of Soil Science, Ufa Institute of Biology UFRC RAS, Ufa, Russia
Timur Garipov: Laboratory of Soil Science, Ufa Institute of Biology UFRC RAS, Ufa, Russia
Irik Saifullin: Laboratory of Climate Change Monitoring and Carbon Ecosystems Balance, Ufa State Petroleum Technological University, Ufa, Russia
Evgeny Abakumov: Department of Applied Ecology, Faculty of Biology, St. Petersburg State University, St. Petersburg, Russia

Soil and Water Research, 2022, vol. 17, issue 4, 222-232

Abstract: The morphological, water-physical and chemical properties, basal respiration of the southern chernozem (Chernozem Haplic Endosalic) and erosional sediment in the Trans-Ural steppe zone (Republic of Bashkortostan, Russia) were studied. The surface soil horizon significantly differs from the sediment by the better structure and water aggregate stability. The particle size distribution of the sediments, due to erosion, contains more silt and clay fractions compared to the slope soil. It indicates a great potential for the carbon saturation of the soil which is limited by degradation. The slope soil is slightly saline, the type of the salinisation is sulfate with the participation of hydrocarbonates. The CО2 emissions, the organic carbon and alkaline-hydrolysable nitrogen content is low; and significantly lower than in the erosional sediment, but the content of exchangeable cations and water-soluble salts is higher. The structural composition of the humic acid (HA) extracted from the soil and erosional sediments was determined by 13C NMR spectroscopy. Aliphatic structural fragments predominate (65%) with a maximum signal level in the area of C, H-alkyls in the HA of the surface horizon. In the HA of the erosional sediment, the proportion of aromatic structural fragments is higher (up to 59%), which is associated with the processes of hydrolysis and condensation. In the HA of the slope soil, the formation of predominantly C, H-alkyls, oxygen-containing groups, including carboxyl ones, takes place. Differences in the composition of the structural fragments and functional groups of the soil and sediment HA are due to the different stability of the organic matter under conditions of the development of the soil erosion processes.

Keywords: carbon sequestration; erosion; nuclear magnetic resonance; sediment; soil properties (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlswr:v:17:y:2022:i:4:id:52-2022-swr

DOI: 10.17221/52/2022-SWR

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