The thesis deals with the study of changes in forest vegetation in the oak forests communities located in the second level of the forest vegetation on andesites in volcanic mountains Pohronský Inovec and Vtáčnik. We reviewed these recent changes through renewal 12 original typological representative areas. The areas were in this region based on a detailed typological survey between 1964 and 1968. The methodology of the reconstruction work was identical to the methodology when they were first set up. The data obtained from the restored areas as well as the data from the original areas were processed in the JUICE program, where we've used pointers during the evaluating vegetation changes stability, fidelity and average coverage. We further processed the data indirectly gradient analysis of DCA using the CANOCO program package. After evaluating of the results, we can say that in the oak forests communities there are relatively similar changes in the aforementioned mountain range as in the Slovakia level or in a temperate Europe. And to increase the stability of genuine forest scientists and mesophytes and, on the contrary, the decline of light-sensitive, thermophilic and oligotrophic species. At the same time, the underfloor space is undergone by Fagus sylvatica and Carpinus betulus. These currently running changes are likely to be caused by changing the management of the oak forests communities and subsequent eutrophication environment or climate change.