Dynamics Evaluation of Chosen Forest Communities of Eastern Beskydy Mts.

The paper deals with the problem of qualitative and quantitative changes in the phytocoenosis in the area of Eastern Beskydy over 35 years. Phytocoenological relevées of (phytocoenological) plant communities from 1973 and 2008 were compared. To review the changes in the ecological spectrum of communities the ecological analysis according to Ellenberg was used (1992). As for the tree composition the number of fir decreased in favor to beech, as well as the crop density and stand canopy decreased. Thus, the abundance and dominance values changed among observed communities. Partly, changes in the tree composition of phytocoenosis were recorded. The ecological analysis confirmed the shifts in ecological spectrums as for the light, soil acidity and soil nitrogen. On one hand the acidification of these communities is not expressive but on the other hand species of meso- and nitrophylous character subsided and were replaced by acidotolerant species.