Basic density of Scots pine wood-relationships between values calculated at different heights of the trunk

: Basic density of Scots pine wood – relationships between values calculated at different heights of the trunk. The aim of this study was to analyse relationships between basic density of wood determined at different heights on the trunks of Scots pines, particularly between breast height and other parts of the stem. Analyses were conducted on material from 63 sample trees from Central Pomerania (northern Poland). Five samples were collected from the trunk of each mean sample tree. Each sample was located at a different height (level). The first came from the breast height level, while the second and the successive ones were denoted with relative values, i.e. 20 (SII), 40 (SIII), 60 (SIII) and 80% (SV) tree height. It was found among other things that basic density decreased with a reduction of distance from the tree top. The dynamic of these changes was particularly evident in the butt end of the trunk. Linear dependencies, confirmed by high linear correlation coefficients, were found between wood density at breast height and in other parts of the stem. Values of linear correlation coefficients and coefficients of determination decreased with an increase in the distance between breast height and the section. Breast height provides a representative cross-section of the stem. Basic wood density determined at this level may be used to model density in other parts of the stem. effect of wind loading of trees on variation in selected technical parameters of wood in Scots pine sylvestris

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