In the former Robanov kot forest reserve, five permanent research plots were established in 1987 and were re-measured in 1999. As part of this master's thesis, we conducted a third consecutive measurement on two research plots to analyze long-term changes in the structure and dynamics of two different forest types: a relatively natural beech stand and a mixed stand on a former clearing. By comparing data from previous measurements, we monitored changes in species composition, diameter structure, tree density, growth, mortality, the amount of deadwood, and the presence of tree-related microhabitats (TreMs). We found a decrease in tree numbers, an increase in average and maximum diameter at breast height, a high volume of deadwood (207 m³/ha), a greater number of TreMs (4.6 TreMs/tree), and a gradual dominance of beech in the beech stand. Indicators such as the presence of large trees, deadwood structure, and TreM diversity point to characteristics typical of old-growth forests. In the mixed stand, spruce dominated the total basal area, while the number of beech trees decreased by 40%. The volume of deadwood was lower (46 m³/ha), consisting mostly of smaller-sized and standing snags. Based on these findings, we conclude that the beech stand exhibits a relatively stable structure characteristic of an old-growth forest, whereas the development of the mixed stand does not support the expected transition toward a beech-dominated forest.
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