Soil Organic Matter in Soils of Suburban Landscapes of Yamal Region: Humification Degree and Mineralizing Risks

Ivan Alekseev, Gleb Kraev, Aleksandr Shein and Pavel Petrov
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Ivan Alekseev: Otto Schmidt Laboratory for Polar and Marine Research, Arctic and Antarctic Research Institute, 199397 Saint Petersburg, Russia
Gleb Kraev: Yamal-Nenets Center of Arctic Research, 629008 Salekhard, Russia
Aleksandr Shein: Yamal-Nenets Center of Arctic Research, 629008 Salekhard, Russia
Pavel Petrov: Institute of Physics and Chemistry, Ogarev Mordovia State University, 430005 Saransk, Russia

Energies, 2022, vol. 15, issue 6, 1-11

Abstract: Various research issues related to soil organic matter in permafrost soils are still poorly investigated. At the same time, numerous investigations have shown the importance of permafrost soils, as they serve as a huge reservoir of organic matter. This work is aimed at the investigation of permafrost-affected soils in the southern part of the Yamal region, namely at the assessment of composition (fractional, elemental and molecular) of soil organic matter in topsoils formed under different biogeoclimatogenic conditions in tundra and forest tundra. Special attention was given to assessment of potential vulnerability of soil organic matter in the context of Arctic warming. Results showed the predominance of fulvic acids in the humus of the studied soils, which indicates mineralization risks in the humic substances system of Arctic soils under conditions of further warming. The 13 C-NMR analysis of humic acids revealed that all the studied soils are characterized by higher portions of aliphatic groups of carbon and decreased portions of aromatic groups and revealed early stages of the humification process in studied soils. These results contribute to scarcely distributed research of soil organic matter in permafrost soils of the Arctic. Moreover, our research provided new data on the vulnerability of soil organic matter and its possible mineralization risks under pronounced climate change in the Arctic using the modern instrumental technique.

Keywords: Yamal; permafrost; Arctic warming; soil organic matter; humification; 13 C-NMR spectroscopy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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