Synanthropization and species diversityof floodplain ecosystems of the Ob-Irtysh basin, Russia

Currently, the phytocenoses of Irtysh floodplain are experiencing intense anthropogenic pressures due to intensive development oil and gas industry, as well urbanization territory. This paper focuses on structure species composition 27 studied areas in ecosystems Ob-Irtysh basin. As a result research, we found 111 vascular plants from 33 families plant communities. The belong meadows forest vegetation represented by (1) birch forests (33%), (2) pine (10%), (3) fir (8%), (4) aspen (4%) (5) associations (45%). Furthermore, conducted comparative analysis according Drude scale. To determine transformation flora individual communities, determined synanthropization index (the ratio synanthropic total number species). In fraction, distinguished 45 belonging 12 families, with most multispecies being Apiaceae, Scrophulariaceae, Compositeae, Ranunculaceae, Poaceae, Fabaceae, Plantaginaceae. ranges 6.6% 81.2%. largest occurs meadow associations, content synanthropes is greater than 50%, becoming more superficial, productivity stability communities changing. study horizontal grass stands makes it possible find variability different years, change dominant composition. researchers paying considerable attention herbage, since its great theoretical practical importance clarifying phytocenotic relations.