Anatomical properties affect the permeability of wood and need to be considered when wood is impregnated with wood protection agents. While Scots pine sapwood material is known to be easy to impregnate, great variations in permeability can be observed. In order to study anatomical differences in the structural elements of transverse fluid passage, high and low permeability wood material has been compared. Ray composition, resin canal network, and membrane areas of fenestriform pits in the crossfield were investigated.
The results showed large differences between high and low permeability material. Low permeability Scots pine sapwood samples developed more rays per mm² tangential section while those were on average lower in cell numbers than rays found in high permeability material. Highly permeable material had more parenchyma cells in rays than low permeability material. At the same time, a larger membrane area in fenestriform pits in the crossfield was observed in the high permeability sample fraction. Differences in the composition of resin canal network were not observed. In low permeability Scots pine sapwood material, fenestriform pits in the cross field and parenchyma cells were developed in smaller dimensions or number.
Keywords: Pinus sylvestris, treatability, impregnation, wood modification
Authors
Zimmer K.
Norwegian Forest and Landscape Institute, Ås, Norway
Norwegian University of Life Science, Department of Ecology and Agricultural Resource Management, Ås, Norway
Treu A.
Norwegian Forest and Landscape Institute, Ås, Norway
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