Ustupující a mizející společenstva říčních rákosin s převládajícím druhem Phalaris arundinacea na Divoké a Spojené Orlici

Based on the field investigation in 1962-1969, the species composition, distribution and ecology of communities with Phalaris arundinacea along the Divoká and Spojená Orlice rivers (NE Bohemia) are described . The flow of the rivers was only little changed dueto canalization. The following communities were analysed: Phalaridetum arundinaceae Libbert 1931 em., Rorippo-Phalaridetum arundinaceae Kopecký 1961, Petasito officinalis-Phalaridetum arundinaceae Schwick. 1933 em. and Calamagrostietum pseudophragmitis Kopecký 1968.