The contribution deals with the results of an investigation of the floodplain forests succession in the Middle Danube (Bratislava, Slovakia). The forest segments age was established on the basis of historical maps, and the present successional stage of the geobiocoens was identified by a phytocoenological investigation in the field. The 210-250 years old sites are represented at present by associations Fraxino-Populetum, Ulmo-Fraxinetum aegopodietosum and Ulmo-Quercetum caricetosum albae. The communities Ulmo-Fraxinetum hederotosum and Ulmo-Quercetum convallarietosum have developed in sites older than 350 years. The successionally youngest association Salici-Populetum; survives on the bottom of a former fiver arm originating from the 18th century. The genetic developmental relationships of individual syntaxa and limits of their existence were more precisely characterized (Fraxino-Populetum). The human impact on the historic dynamics (succession speed) of forest communities is also evaluated and a model successional line is presented. The results underline the present level of endangerment of individual communities by disturbance of fluvial processes influencing the natural succession of the floodplain forest geobiocoens, and emphasise necessity of their protection.