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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «BIOLOGIYA. ECOLOGIYA»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «BIOLOGY. ECOLOGY»
ISSN 2073-3372 (Print)

List of issues > Series «Biology. Ecology». 2025. Vol 52

Influence of Temperature and Moisture of Soil on the Seasonal and Diurnal Dynamics of Soil CO2Emissions in the Cowberry-Lichen Pine Forest in the Pechora-Ilych Nature Reserve (Northern Urals, Russia)

Author(s)

R. V. Kudryavtsev1, M. N. Miglovets2

1 Pitirim Sorokin Syktyvkar State University, Syktyvkar, Russian Federation

2 Institute of Biology KomiSC UB RAS, Syktyvkar, Russian Federation

Abstract
The first results of a study of soil CO2 emissions in the Pechora-Ilych Nature Reserve (middle taiga subzone, south-east of Komi Republic) have been obtained. The intensity of CO2 emissions from the soil surface was studied in an undisturbed area of cowberry-lichen pine forest and in an area affected by a ground fire. Soil CO2 fluxes were measured using a chamber method from late May to late August in 2022 and 2024. It was found that soil temperature in the 0– 20 cm layer has a significant positive effect on soil respiration, while volumetric soil water content at a depth of 20 cm inhibits this process. However, soil temperature at a depth of more than 20 cm and surface soil moisture do not significantly affect soil respiration. The average CO2 emission rates from the soil surface were 227±30 mg m⁻² h⁻¹ and 242±29 mg m⁻² h⁻¹ in the undisturbed and fire-affected plots, respectively. The seasonal peak in CO2 emissions was observed from mid-July to early August, which is associated with optimal hydrothermal conditions during this period. The daily maximum was observed in the evening hours in the undisturbed plot and at midday in the fire-affected plot. The differences are due to the more rapid warming of the post-pyrogenic soil due to the absence of living ground cover. The amplitude of diurnal fluctuations in CO2 emissions is 44–80 mg m⁻² h⁻¹ in the undisturbed plot and 100–185 mg m⁻² h⁻¹ in the post-pyrogenic plot. The results indicate a significant contribution of fire-affected areas to overall CO2 emissions. Significant variations in temperature and precipitation patterns during the seasons under study further linked the seasonal pattern of emissions to seasonal weather anomalies. For example, a cold May leads to lower CO2 fluxes in early summer, as it slows soil thaw and leads to low soil microbiota activity. It was also found that after a ground fire, organic matter in the surface soil layer is unevenly distributed, leading to significant fluctuations in CO2 emissions. According to the results, 10–15 years after a fugitive ground fire, cowberry-lichen pine forests in the middle taiga subzone may become a source of increased carbon dioxide emissions from the soil.
About the Authors

Kudryavtsev Roman Viktorovich, Postgraduate Pitirim Sorokin Syktyvkar State University 55, Oktyabrsky ave., Syktyvkar, 167001, Russian Federation e-mail: kudriavtsevroman@mail.ru 

Miglovets Mikhail Nikolaevich, Candidate of Sciences (Biology), Research Scientist Institute of Biology Komi SC UB RAS 28, Kommunisticheskaya st., Syktyvkar, 167982, Russian Federation e-mail: miglovets@ib.komisc.ru

For citation
Kudryavtsev R. V., Miglovets M. N. Influence of Temperature and Moisture of Soil on the Seasonal and Diurnal Dynamics of Soil CO2 Emissions in the Cowberry-Lichen Pine Forest in the Pechora-Ilych Nature Reserve (Northern Urals, Russia). The Bulletin of Irkutsk State University. Series Biology. Ecology, 2025, vol. 52, pp. 49-65. https://doi.org/10.26516/2073-3372.2025.52.49 (in Russian)
Keywords
pine forest, soil CO2 emission, temperature, moisture, seasonal dynamics, daily dynamics, Pechora-Ilychsky Reserve.
UDC
574.4
DOI
https://doi.org/10.26516/2073-3372.2025.52.49
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