EMISSIONS FROM FIRES IN THE STANDS OF CENTRAL SIBERIAN SUBTAIGA-FOREST-STEPPE REGION
V. A. Ivanov1,2, G. A. Ivanova1, E. O. Baksheeva2, D. V. Shebeko2
1Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, V. N. Sukachev Institute of Forest, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
2Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Keywords: forest fires, fire-hazardous period, forest combustible materials, fire emissions, greenhouse gases, self-purification of the atmosphere
Abstract
Forest fires occur annually on the territory of the Central Siberian subtaiga-forest-steppe region. During the five-year period from 2018 to 2022, 1303 fires were registered. The areas covered by forest fires during this period amounted to 87.5 thousand hectares. The article presents calculations of greenhouse gas emissions from fires in forest area plantations for the period under review. The volume of emissions from forest fires is determined by the intensity of burning and weather conditions. Using the data obtained on the amount of combustible forest materials burned in a fire, the mass of greenhouse gases (CO2, CH4, N2O) released during combustion was calculated, depending on the type of planting and weather conditions affecting the drying of combustible materials using generally accepted methods. It was revealed that greenhouse gas emissions range from 13.5 thousand tons to 804 thousand tons annually during fires in plantations of the Central Siberian subtaiga-forest-steppe region. Over the five-year period under review, according to estimates, more than 1.2 million tons were released during forest fires. greenhouse gases, with a predominance of CO - CO2. The largest share of emissions from fires (more than 95 %) falls on the spring fire season. The variability of the self-purification coefficient of the atmosphere varies significantly by periods of the fire season. It was revealed that favorable conditions for the dispersion of emissions from forest fires in the territory of the Central Siberian subtaiga-forest-steppe region develop in the spring period, when the largest number of windy days is recorded.
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