The paper presents the structure analysis of breast height diameters, heights and of the biosocial structure of the 39-year old pedunculate oak introduced artificially and growing until 1991 in different conditions created by three different cuttings carried out in the hornbeam-oak old-forest growing on the fresh mixed broad-leaved forest site. Following the removal of the old-forest in winter 1986/87 (group clear cutting) and in winter 1991/92 (shelterwood cutting), in all three variants the oak is growing in open space. The inventory carried out in 2007 showed that in each case the best experimental results were recorded in the stand with clear cutting (1-Rz). Stands from the 2-Rcz and 3-Rg achieved worse, albeit statistically non-significantly different, results. However, formally, from the point of view of mean breast height diameter and height, a slightly better situation was recorded on the 3-Rg plot, while from the point of view of the mean biosocial class – on the 2-Rcz plot.

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