The research deals with changes of the upper forest border (UFB) between 1954 and 2015, as well as with its structure studied through the analysis of longitudinal terrain and vegetation profiles in the cardinal directions, and the analysis of stand structure and composition on temporary research plots. The actual UFB was determined using the LiDAR data and digital crown model in the ArcMap software; the same software was used to derive the longitudinal terrain and vegetation profiles. The inventory of forest stands below and on the actual UFB, as well as individual trees above the UFB, was performed on five temporary research plots of 30 × 10 m. No major changes of the UFB was observed in the period 1954-2015, yet the mountain pine areas expanded to a large extent till 2009. Forest stands on the UFB consist of beech only, whereas individual beech trees above the UFB are mixed with rowan, sycamore maple and spruce trees. Spruce was not surveyed on the research plots, but was detected higher up the slope. Forest stands on the UFB were vital and with minor injuries. Different forms of the UFB were observed, it can be gradual or sharp. Gradual decreasing in stand height was evident, as well as the increased presence of individual trees above the UFB. Only minor UFB changes were observed in the last 60 years, thus no major changes are expected in the near future. Yet, the expansion of mountain pine areas can be expected on grassland and other open spaces.
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