Urbanization Affects Soil Microbiome Profile Distribution in the Russian Arctic Region

Maria V. Korneykova, Viacheslav I. Vasenev, Dmitry A. Nikitin, Anastasia S. Soshina, Andrey V. Dolgikh and Yulia L. Sotnikova
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Maria V. Korneykova: Agrarian and Technological Institute, Peoples’ Friendship University of Russia (RUDN University), 117198 Moscow, Russia
Viacheslav I. Vasenev: Agrarian and Technological Institute, Peoples’ Friendship University of Russia (RUDN University), 117198 Moscow, Russia
Dmitry A. Nikitin: V.V. Dokuchaev Soil Science Institute, Russian Academy of Sciences, 119017 Moscow, Russia
Anastasia S. Soshina: Institute of North Industrial Ecology Problems, Subdivision of the Federal Research Centre, Kola Science Centre of Russian Academy of Sciences, 184209 Apatity, Russia
Andrey V. Dolgikh: Institute of Geography, Russian Academy of Sciences, 119017 Moscow, Russia
Yulia L. Sotnikova: Agrarian and Technological Institute, Peoples’ Friendship University of Russia (RUDN University), 117198 Moscow, Russia

IJERPH, 2021, vol. 18, issue 21, 1-19

Abstract: Urbanization in the Arctic results in considerable and still poorly known environmental consequences. The effect of urbanization on soil microbiome—an ecosystem component highly sensitive to anthropogenic disturbance—remains overlooked for the Arctic region. The research compared chemical and microbial properties of the natural Podzol soils and urban soils of Murmansk—the largest Arctic city. Particular attention was given to the profile distribution, which is almost completely ignored by most microbial studies. Soil microbiome was investigated by the quantitative indicators based on fluorescence microscopy (microbial biomass) and PCR real-time methods (amount of rRNA genes copies of archaea, bacteria, and fungi). The principal changes in urban soils’ properties compared to the natural references included a shift in pH and an increase in C and nutrients’ contents, especially remarkable for the subsoil. The numbers of rRNA genes copies of archaea, bacteria, and fungi in urban topsoils (10 6 –10 10 , 10 9 –10 10 , and 10 7 –10 9 , respectively) were lower than in Podzol; however, the opposite pattern was shown for the subsoil. Similarly, the total microbial biomass in urban topsoils (0.55–0.75 mg g ?1 ) was lower compared to the 1.02 mg g ?1 in Podzols, while urban subsoil microbial biomass was 2–2.5 times higher than in the natural conditions. Both for urban and natural soils and throughout the profiles, fungi were dominated by mycelium forms; however, the ratios of mycelium–spores were lower, and the amount of thin mycelium was higher in urban soils than in natural Podzols. Urbanization in the Arctic altered soil morphological and chemical properties and created a new niche for microbial development in urban subsoils; its contribution to biodiversity and nutrient cycling promises to become increasingly important under projected climate change.

Keywords: prokaryotes; fungi; biomass; quantitative PCR; soil profile; urban ecosystems; Arctic (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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