The aim of the contribution is to establish the relationships between age, thickness and wood quality or value of some tree species usually defined as valuable broadleaved tree species. Sycamore (Acer pseudoplatanus L.), Norway maple (Acer platanoides L.), common ash (Fraxinus excelsior L.), wild cherry (Prunus avium L.) and black alder (Alnus glutinosa (L.) Gaertn.) were includedin the research. Stem analyses were carried out for all analysed treesand on all log fronts the extent of discoloured wood or rot was measured.Moreover, all parts of usable timber were classified into timber quality classes. Analyses were carried out on different site units, mainly on those, where the analysed tree species play a more important role. Using logistic regression the influence of age, dbh and other tree traits or site characteristics on discoloured wood and rot was established. On the basis of tree age and its timber value the culmination of tree value increment was ascertained.
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