Ecological and coenotic groups of Orenburg Region vascular plants flora and biotopes phytoindication

The expert and statistical assessment of ecological and coenotic groups of Orenburg Region vascular plants flora has been done for A.L. Bel’gards coenomorphs scheme and scheme of vascular plants flora of temperate forest zone of European Russia. The regimes of principal ecological factors have identified for detected groups of flora. Both suggested schemes of groups give adequate and similar assessment of biotopes, proposed groups of Orenburg Region vascular plants flora are identified in phytometer scales space definitely and its groups can used for regional assessment of biotopes. It has been established, that steppe coenomorph has extensive coenotic amplitude in Orenburg Region conditions and make petrophilic, chasmophilic, mountain and semi-desert vegetation elements also. Sylvant coenomorph has formed boreal and nemoral sciophytes and heliosciophytes and coenotic group of semiarid steppe forests has not specific biotopic and coenotic value. Pratal coenomorph has been made up humidity-meadow flora, dry-meadow coenotic group is not specific. For Orenburg Region is recommends using unite pratal (meadow) and paludal coenomorphs and separation coenotic group of oligotrophic bogs and ruderal coenomorph, the separation of mountain coenotic group is not confirmed statistical. The best assessment of ecological flora of region are realize by combined coenomorphs and coenotic group schemes approach at the same time. It has been established methodical problems of statistical methods using by phytoindication, problems of «transitional» coenotic groups and problem of wood species assessment in phytometer scales, which are require further researches.