Wystepowanie Lolium perenne w zbiorowiskach dywanowych na obszarze Gornoslaskiego Okregu Przemyslowego

The aim of this study is to show the role of Lolium perenne L. in the carpet plant communities which develop on trampled places such as: roadsides, wastelands, playgrounds, sport fields, lawns, railway areas in the Upper Silesian Industrial District. In order to recognise plant communities there were made 120 phytosociological relevés. There were recognized 5 plant communities which are built mainly by annuals from Polygono-Poëtea class (Polygonetum calcati, Sagino-Bryetum, Puccinellio-Chenopodietum, Poëtum annuae, Matricario-Polygonetum) and 5 in structure of which the main role play hemicryptophytes from Molinio-Arrhenatheretea class, Trifolio-Plantaginetalia order, Cynosurion (Lolio-Plantaginetum, Juncetum macri), and Agropyro-Rumicion (Potentilletum anserinae, Potentilletum reptantis, Odontites serotine community) alliances. In carpet plant communities occur from 3 to 25 grasses, and their participation in the floristic list range from 12% to 32%. Lolium perenne was recorded in almost each plant community with the exception of Sagino-Bryetum. The highest percentage participation in the plant cover it has in Odontites serotina community and Lolio-Plantaginetum phytocoenoses. In the lalter one it has it ecological optimum