Pyrogenic Impact on the Properties of Pine Wood in the Northern Taiga Subzone
DOI:
https://doi.org/10.37482/0536-1036-2026-4-63-76Keywords:
post-pyrogenic wood, core wood, sapwood, Scots pine, Pinus sylvestris, ground fire,, IR spectroscopyAbstract
The forests of the north of European Russia have been well studied in many respects; however, the impact of wildfires on wood quality remains insufficiently understood. In response to pyrogenic stress, higher plants develop specific reactions similar to those triggered by various types of climatic stressors. The research aimed at examining the chemical composition, properties, and structural features of post-pyrogenic wood of northern taiga pine, as well as assessing the potential for using such wood in biorefining technologies. The Scots pine is a good target species for research as a typical representative of light coniferous forests, which are most susceptible to wildfires. A set of physicochemical methods was used to assess changes in the wood tissue main components. We observed thermal degradation of wood components (cellulose and lignin) due to pyrogenic stress (by 10–13 % in average), as well as a decrease in carbon and hydrogen content (by 16 and 17 %, respectively) in wood tissues in the most fire-damaged butt end of viable trees, along with a 16 % increase in oxygen content. Thermal exposure to the tissues of Scots pine trunks during a ground fire has been found to cause changes not only in the tissue composition but also in the tissue structure. A decrease, followed by a sharp increase in radial growth, was observed in damaged but viable trees several years after the fire. It has been shown that wood of trees damaged by a moderate-intensity ground fire, harvested at a height of 1.3 m and above, does not differ in its chemical composition and physicochemical properties from reference samples of wood that were not exposed to fire stress. Such wood can be used as raw material in the pulp and paper industry.
Funding: The research was carried out within the framework of the state assignment of the N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences.
Acknowledgements: The equipment of the Center for Collective Use of Scientific Equipment (FECIAR UB RAS) was used in the research.
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