Acta Scientiarum Polonorum
Silvarum Colendarum Ratio et Industria Lignaria

The paper presents the results of vegetation studies of ecological lands “Bogdanka I” and “Bogdanka II”, located in the NW part of Poznań. The investigation was conducted during two growth seasons: 2012 and 2013. The vegetation of both ecological lands consists 69 plant communities, including 60 plant associations, belonging to 13 phytosociological classes. The syngenesis of most plant communities is natural (69.6%), mainly natural auxochoric (55.1%). The share of seminatural plant communities, mainly meadows, is 10.1%. From the anthropogenic plant communitities, there is more of xenospontaneous (13%), and less of segetal and ruderal (7.2%). The most natural character of plant communities is the feature of forest plant communities occurring in the river banks as well as littoral vegetation from Phragmitetea class. The most precious plant communities are Carici elogatae-Alnetum, Fraxino-Alnetum, Selino carvifoliae-Molinietum caerulae, Nasturtietum officinalis and Angelico-Cirsietum oleracei. The occurrence of 20 associations considered as threatened in Poland and 24 in the Wielkopolska region confirms high conservation values of the studied object.