This contribution characterizes the phytocoenotic composition of the mixed pine-oak and oak communities classified as the association Frangulo alni-Quercetum robori-petracae M i c h a l k o in M i c h a I k o et al. 1986 nom. nov. M i c h a l k o 1991 and their production-ecological changes in the herb layer caused by an artificial planting of pine monocultures. Results were obtained from the Borska nizina lowland blown, silicate sands.