Effect of forest fires on qualitative characteristics of Scotch pine timber
2009
Korchiagov, S.A. | Gribov, S.E., Vologda State Milk Industry Academy (Russian Federation)
The indices of macrostructure and physicochemical properties of common pine wood formed after a single exposure of a forest creeping fire. The study was carried out on natural pine cowberry or lichen type wood plots exposed to a creeping fire 16 years ago on the territory of the Kadyjskij forest farm in the Vologda region. The control was plots adjacent to these burnt woods and unexposed to fire action. The fire exposure did not greatly reflect on the forest taxation indices. In cowberry-type forests differences in the mean diameter and height of a pine tree between the experimental and control plots are inconsiderable and are only 0.5% and 1.0%, respectively. The control growing stock in the cowberry type forest has by 11% greater stock compared to the experimental one that can be related to large wood attrition due to fire exposure. The similar regularity is also observed in the lichen-type forest. After a creeping fire wood formation is not accompanied by deterioration of its physical and mechanical properties. The increase of the average width of annual ring in pine wood of post-fire origin in cowberry or lichen type forests by 44% and 25%, respectively, compared to the control. Under fire exposure the late wood percentage in annual rings increased by 11% in cowberry pine forest and by 14% in lichen pine forest. The higher compactness of wood in lichen and cowberry type forests by 6.2% and 3.0%, respectively, was observed. The wood harness does not greatly differ in the lichen type forest in the experimental and control variants. In cowberry pine forest after the fire the wood hardness was much higher compared to the control
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