The Pečka Primeval Forest is one of the 14 primeval forest remnants in Slovenia. They are used for measurements for research and tasks such as this. The data obtained provide a good source of information on the natural dynamics and changes in the primeval forest, due to the absence of direct human influence. In 2019, a full tree census was repeated in the permanent sample plots, the first time since 2014, and the measurements date back to 1980. The measurements were carried out in three plots, the data from which were pooled for analysis and compared with the results of the previous measurements. The aim was to show changes in tree structure, growth and mortality. The species composition has partially changed, with only beech (Fagus sylvatica L.) and silver fir (Abies alba Mill.), the builders of the community, and only 2 specimens of mountain elm (Ulmus glabra Huds.) remaining in 2019. The other tree species are present in negligible proportions. The proportion of beech has been increasing over the years and its dominance is expected to continue in the coming years. The mortality rate fluctuates between monitoring periods. Between 1980 and 1998, it is 1.45 %, the highest of the three periods, decreasing drastically to 0.84 % between 1998 and 2014, before rising again to 1.22 % in the most recent period, between 2014 and 2019. Until 2014, no new trees were recorded in the plots, 595 trees were new in that year, and only 164 in 2019, all of the new trees were beech.
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