As a study area, we chose an intersection between the area where the silvicultural class of Scots pine is indicated on the ZGS website, the area where the parent material consists of Permian-Carboniferous rocks, and the area of the Domžale forest management unit. We carried out phytosociological studies according to the Central European method. The experimental plots were laid out in a systematic grid of 250 m x 250 m. There are 35 experimental plots in total. Each experimental plot was 20 m x 20 m in size, and within these plots 20 m² were reserved for recording regeneration in the subplots. Each experimental plot consisted of five subplots: four in the corners of the larger experimental plot and one in the center. In the past, the litter in the study area was cleared, decimating the forest and allowing secondary acidophilous pine forests to develop. We also compared our surveys with those of Gabrijel Tomažič, who documented acidophilic pine forests in similar habitats in 1942. We found that the forest condition has changed over the last 81 years. In particular, the proportion of Scots pine has decreased in favor of deciduous trees. By far the most common species are common beech, sessile oak and sweet chestnut. The proportion of light-demanding species is now significantly lower than it used to be, and species diversity is decreasing as succession progresses. The Vaccinio myrtilli-Pinetum sylvestris community used to thrive in our study area, but today the forest is transitioning into a Blechno-Fagetum community due to successional development.
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