The present study describes changes that have occured in the
phytocoenosis of Pino-Quercetum abieieiosuni in the „Jamno” reserve. It was determined
that the vegetation of this reserve, due to its high dynamics, recovers to its
natural form of Tilio-Carpinetum lypicum with Abies alba. The disapperance of Pinus
silvestris from all layers of the phytocoenosis and an essential increase in Carpinus
betulus and Quereus rohur in the tree-stand was observed. A slight quantitative increase
in Abies alba in the tree-stand was also noticed. Changes in the field layer consist mainly
in the extinction of species typical of coniferous and increase in species typical of
deciduous forests.