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The paper is focused on production analysis of herbaceous layer biomas of hardwood floodplain forests (Ulmenion O ber d. 1953) on the outskirts of Bratislava. For our research, three sample sites were established in Pečenský les forest (Petržalka), Dunajské ostrovy islands (Rusovce) and Topoľové hony forest (Podunajské Biskupice). The first two sites represent hardwoord forests within interdike space that experience regular flooding and minimal forestry influences. The third site reflects dryer site conditions outside interdike space, without flooding impact and with pronounced forestry interventions. Sites were chosen to reflect two slightly different associations within the Ulmenion: association Fraxino pannonicae-Ulmetum S o ó in A sz ó d 1936 corr. S o ó 1963 and association Lithospermo-Ulmetum carpinifoliae D ž atko 1972. Estimation of aboveground biomass was determined through indirect sampling modified for non-repeated field measurements (Kubíček, Brechtl, 1970). Total biomass was highest on the site Dunajské ostrovy islands 1041.64 kg. ha-1, lowest total biomass was on the site Topoľové hony forest 404.12 kg. ha-1. The results are compared with the results of Kubíček, Šomšák (1985) and Kubíček (1999).