Abstract
Wildfires result in the emission of large volumes of toxic smoke, which is transported hundreds of kilometers away from the fires and can have an adverse impact on soil, biota, and humans. A series of modelling experiments on pyrogenic fumigation of soil has been carried out to assess the effects of gaseous products of wildfires on soil biochemical parameters. The effects of continuous exposure to gaseous substances and periodical, repetitive effects of smoke exposure on soil have been determined. The results have been compared with a single intense smoke exposure. It was found that pyrogenic impact significantly affected the enzymatic activity of ordinary chernozem. The degree of influence depended on the duration and periodicity of smoke exposure. In all experiments, enzymes of oxidoreductase class (catalase, peroxidase, polyphenol oxidase) were more sensitive to fumigation than invertase from hydrolase class. High concentrations of toxic gases were the cause of suppressed enzymatic activity of soils. The following concentrations exceeded the maximum permissible concentrations for atmospheric air: CO 714 times, phenol (hydroxybenzene) 441 times, acetaldehyde 24100 times, formaldehyde 190 times. Accumulation of polycyclic aromatic hydrocarbons (PAHs) in soil after fumigation was revealed, the total content of PAHs was 377 ng/g. The highest values were recorded for naphthalene, where the concentration was 4.4 times higher than the maximum permissible concentration and phenanthrene, 2.8 times higher than the maximum permissible concentration. It has been found that 60-min intensive smoke affects the soil to a lesser extent than continuous and periodical ones. Indices of enzymatic activity of chernozem after such fumigation decreased by 15–33% depending on the enzyme, and after continuous and periodical by 41–84 and 31–78%, respectively. The obtained data indicated a significant effect of smoke on the enzymatic activity of soils under continuous and periodical exposure to gaseous products of combustion.
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The work was supported by the Ministry of Science and Higher Education of the Russian Federation, project no. FENW-2023-0008, and by leading school of science of the Russian Federation, project no. NSh-449.2022.5.
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Nizhelskiy, M.S., Kazeev, K.S., Vilkova, V.V. et al. Continuous and Periodical Effects of Smoke from Crop Residue Combustion on Soil Enzymatic Activity. Eurasian Soil Sc. 57, 623–634 (2024). https://doi.org/10.1134/S1064229323603256
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DOI: https://doi.org/10.1134/S1064229323603256