Features of the Thermal Regime and Humidification of Post-Pyrogenic Steppe Landscapes
https://doi.org/10.31857/S2587556620040111
Abstract
The destruction by fire of the above-ground part of the vegetation cover leads to the formation of special microclimatic conditions for the subsequent restoration of the steppe ecosystems’ components. In this regard, the analysis of long-term data (2015–2018) of autonomous recorders of temperature and humidity of the surface of the burned areas, near-surface layers of soil and air in the Burtinskaya Steppe area of the Orenburg Nature Reserve (Orenburg oblast) was conducted. Information on the snow cover occurrence taken as a result of snow surveying and analysis of remote sensing data (images from MODIS and Landsat) was taken into account. It has been revealed that the absence of formed vegetation cover in winter periods leads to a reduction in the snow cover’s thickness and duration of its presence. It is the cause of a more significant freezing of the soil at the bur burned areas and the deterioration of spring wetting conditions. The warm snowless period of the year is characterized by clearly pronounced daily amplitudes of the temperatures course, with an increased thermal background under conditions of increased insolation, both on the surface of the burned areas and in the near-surface layer of the soil. The results indicate that the microclimatic regime of burned areas in the first years after the fire is significantly different from the background areas. According to the considered indicators’ long-term dynamics, the recovery processes can be considered completed after four complete vegetation periods after the fire.
Keywords
wildfires,
steppe,
burned areas,
thermal regime,
moisture conditions,
vegetation cover,
post-pyrogenic successions,
monitoring
Supporting agencies: The study was financially supported within the framework of the state-ordered research theme of the Institute of Steppe UB RAS (no. АААА-А17-117012610022-5) and by the Russian Foundation for Basic Research (grant no. 1805-00088).
About the Authors
V. M. Pavleichik
Institute of Steppe, Ural Branch, Russian Academy of Sciences
Russian Federation
Orenburg
Russian Federation
Orenburg
O. G. Kalmykova
Institute of Steppe, Ural Branch, Russian Academy of Sciences
Russian Federation
Orenburg
Russian Federation
Orenburg
O. V. Soroka
Joint Directorate State Nature Reserves “Orenburg” and “Shaitan-Tau”
Russian Federation
Orenburg
Russian Federation
Orenburg
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Pavleichik V.M., Kalmykova O.G., Soroka O.V. Features of the Thermal Regime and Humidification of Post-Pyrogenic Steppe Landscapes. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2020;84(4):541–550. (In Russ.) https://doi.org/10.31857/S2587556620040111
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