Abstract: Studied stand of alder swamp forest (Angelico sylvestri - Alnetum glutinosae) is situated on alluvial plain of river Drava. Coenological survey of designated area has been made in every year. In this paper we analyze data of five consequent years (2000-2004). There are year-to-year changes in coenological characteristics of the community. Experienced changes are connected undoubtedly to changes of water supply of the growing place.