Variation of Selected Macrostructure Features and Density Wood of the European Spruce (Picea abies (L.) Karst.) in the Cross-Section of Trees over 90-Years-Old in Poland

In the present study, following features were investigated: variability of selected macrostructure (width annual growth ring and share latewood) wood density European spruce (Picea abies (L.) Karst.) in a cross-section trunk. The study was conducted locations northeastern range (12 research plots) southwestern (20 Poland. On testing plots, Pressler drill borehole samples taken from 15 trees. Then, divided into 2 cm long sections and, for each section, average width ring, latewood, relative calculated. conclusion, it found that rings tested material increasing constantly outer circumference (the perimeter) trunk towards pith. greatest latewood not only perimeter zones tree but also close to It discovered highest densities occur zones, these decrease next pith an increase noted. Having analysed relationships between examined features, can be concluded affects both density. aforementioned negative correlations, whereas impacts determined have positive correlation.