Properties of spruce wood fibers affected by rot

In the conditions of the Arkhangelsk region, coniferous forests predominate, and first of all, stands of European spruce (Pícea ábies), which are undergoing active economic development. One of the main reasons for the decreasing of spruce stands merchantable structure is the impact of wood-destroying fungi. Basidial fungi are most common in the spruce stands of the research area: root rot (Heterobasidion annosum (Fr) Bref), and spruce rot (Phellinus chrysoloma), causing variegated corrosive root and stem rot. The disease leads to the loss of part of the commercial wood, causes the windbreak and a windblow formation. In this regard, it is of interest to study the process of rotting wood and the possibility of using rot-damaged wood. Coniferous wood was cooked under laboratory conditions. It is established that in production conditions it is possible to use spruce wood affected by corrosive rot no higher than stage 1 without a significant decrease in the quality of the semi-finished product. Cellulose obtained from spruce wood damaged by rot of stages 2, 3 and 4 is characterized by a lower yield of cellulose compared to a sample obtained from healthy wood. The structural and morphological characteristics of cellulose fibers from damaged wood have specific features. Many questions regarding pathogenic fungi that cause the main diseases of conifers remain insufficiently studied.

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