The paper presents the results of the research carried out in even-aged Norway spruce stands regarding the density of wood. This research brought up some unknown aspects that can be considered as new contributions concerning the variation way of wood density, one of the most important wood quality components. Using an original method to determine the infradensity and a special methodology for data treatment, it was possible to establish a model for prediction of wood infradensity variation within tree based on the relationship between this characteristic and the cambial age, ring width and relative height on the trunk of spruce trees.
Keywords: Norway spruce trees, mean infradensity of the wood, wood quality.