The type of the channel pattern is being considered as indicative element of the fluvial environment, especially for lowland, mature rivers. Investigations carried out in the Pilica River valley (example of such river) between Inowłódz and Domaniewice (grant no 2P04E 069 29, Ministry of Science) have shown that morphological features of the valley bottom (channel zone, as well as flood terrace) depends not only on river regime, but also on channel zone geological setting. Elements of the Pilica valley geology infl uencing on fluvial processes are protrusions of alluvia basement composed of deposits resistant to erosion, crop out in the channel zone.
In the paper a list of 404 species of weeds recorded on segetal habitats of the Pilica River Landscape Parks is given. In addition characteristics and evaluation of anthropogenic changes of segetal flora of those Parks is presented.