The dynamics of the perennial grass crops communities on the restoration succession gradient

The trends of the coenoflora structure dynamics perennial grass crops communities were characterized on gradient restorative succession in conditions steppe and forest-steppe zones Southern Urals. Using an agglomerative cluster analysis, four community groups have been identified, which corresponds to stages reflecting age (from 1 16 years or more). It is demonstrated that complicates species composition, richness increases by almost 2 times. An analysis activity index change for core at each stage has carried out. revealed sown herbs decreases, while total well-eaten as well feed value whole phytocoenoses with communities. A marked a group highly active species, functional composition coenotic affinity changes. apophyte synanthropic ones decreases. There natural complication phytosociological spectrum from affine classes vegetation Sisymbrietea Artemisietea meadows (Molinio-Arrhenatheretea) steppes (Festuco-Brometea). At same time, most substitution occurs after second succession, i.e. its significant acceleration observed 11 years. According results ordination (DCA-ordination) additional assessment contribution environmental variables, leading differentiation factor communities, humidification habitats makes smaller contribution. comparison studied data weed, meadow database non-forest Urals (1660 releves), central position crop disturbed arable land (steppes) quasi-natural (meadows) types demonstrated. Thus, high importance creation stable forage value, can be used restoration biodiversity regions, revealed.