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Admission. The paper presents characteristics of selected measurement features of European ash in a fresh broadleaved forest. The aim of the study was to analyse the impact of age and height class on chnages in breast height, tree height and slenderness of European ash. Material and methods. The empirical material was collected on 9 surfaces of 25 ares each, representing the habitat type of fresh broadleaved forest, located in the following forest districts: Babki, Konstantynowo and Łopuchówko. In the selected stands, ash represented various shares in the stand composition. The location of the experimental site was determined by the dominance of ash in the selected part of stand. For height and diameter at breast height measurements high trees were selected, with free apexes above the top canopy surface in the stand and trees with tops within the main canopy level. In total, 135 trees of European ash were measured. The slenderness ratio was calculated and two-way analysis of variance was carried out for the age and height class in European ash. Results and conclusions. The analysis showed a statistically significant differentiation in selected measurement characteristics of European ash depending on age and height class.

acta scientiarum polonorum. silvarum colendarum ratio et industria lignaria

The impact of age and height class on the diversity of measurement characteristics of European ash (Fraxinus excelsior L.) growing in a fresh broadleaved forest