Geomorphological variability of river valleys and natural values of meadow communities

摘要

The geomorphological variability of river valley beds and, hence, variations in site conditions, affects the spatial configuration of meadow communities in the landscape, as well as their wealth and floristic diversity. Phytocoenoses developed on a floodplain show the greatest number of species, as well as the highest index of floristic diversity. On the other hand, communities occurring in old river-beds and along river banks, as well as on floodplains in sites with changing moisture conditions, arecharacterised by the presence of many floristic peculiarities which affect their natural values.