Study of macroand microstructure of flooded spruce wood

Unstudied are the properties of flooded standing wood, the amount of which in the water area of the Angara-Yenisei HPP cascade, in particular in the conditions of the Bratsk reservoir, is quite large and there is the possibility of its harvesting and processing.

Flooded spruce wood has a gray and gray-brown uneven color and well-defined growth rings with smooth transitions between the zones of early and late wood, which are clearly expressed. A number of changes in the structure of spruce wood have been revealed. It has more saturated dark shade of the cell walls of axial tracheids. The structure of the layers of the cell walls of the tracheal anatomical elements is decompressed, which leads to partial delamination of the walls of early tracheids when transverse sections are obtained. The brown contents of the protoplasts of the parenchymal cells of the rays and the cavities of the ray tracheids are often observed. On the surfaces of cavities, mainly late tracheids, a thin dark-colored layer is revealed, which is the inner layers changed during staining with additional “sedimentary” organic components. In all tracheal and radial anatomical elements of wood, the same type of thin nonseptate hyphae of a wood-destroying fungus are revealed.

The destruction of wood under the influence of a mycological factor may has made a contribution of amorphous deposits in the cavities of wood cells, as well as to a decrease in the mechanical properties of the studied material. In general, during the anatomical analysis of flooded spruce wood, structural changes were identified that could affect the mechanical properties of wood in comparison with non-fusible wood of similar macrostructure. The obtained results of the macroand microstructure of spruce wood samples allow us to conclude that this wood can be further used to obtain new wood composite materials, as well as to improve the modification technology based on the use of flooded wood.

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