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T. Dubravac, S. Dekanić, V. Roth: DINAMIKAOŠTEĆENOSTI I STRUKTURAKROŠANJA STABALA HRASTA... Šumarski list – Posebni broj (2011), 74-89


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SUMMARY: The crown damage of a tree has a very prominent place among the broad
spectrum of factors defining the pedunculate oak (Quercus roburL.) decline and dieback,
largely due to the fact that it represents the first visible symptom of the decline in tree‘s vitality.
Besides, crown damage is a key factor for the selection of trees with high risk of
dying during the sanitary and salvage cuttings, in order to salvage high value timber that
would be otherwise lost or severely degraded when the tree dies. Aim of this contribution
is to investigate dynamics of crown damage of pedunculate oak trees, as well as the effect
of the crown damage on tree’s basal area increment during longer time period in two most
important types of pedunculate oak forests in Croatia. Research was done on permanent
experimental plots situated in the stands of pedunculate oak and common hornbeam
(II-G-10) and stands of pedunculate oak and Genista elata (II-G-20). In total, 38 permanent
experimental plots were used, out of which 13 were re-measured with intervals of 9 to
17 years (Table 1). In first measurement, all trees on plots were permanently tagged, and
map of tree locations and crown projections was made. Trees were measured for diameter
at breast height (DBH), total tree height and height to crown base. Crown length was calculated
as the difference between the total tree height and height to crown base, while the
crown ratio was calculated as the ratio of crown length and total tree height. From the
map of horizontal crown projections the average crown width was calculated as a mean of