Features of plant communities formation Stipeta zalesskii in the "Ural steppe" ("Orenburg" state natural reserve)

Studies of the characteristics of plant communities formation Stipeta zalesskii was held on the territory of one of the plot «Orenburg» State Natural Reserve - «Ural steppe». Most of the territory of this area was subjected to anthropogenic impact. In connection with this very widespread plant communities disturbed due to grazing farm animals, ploughing, improvement of hayfields, use of the land for military training purposes. Community formation Stipeta zalesskii in the «Ural steppe» dedicated mainly to the gravelly slopes, logs and lowland areas. The diverse floristic composition of phytocenoses of the studied formation. 112 revealed higher vascular plants. Flora salesmobile formation includes 6 species from the Red book of the Russian Federation and Orenburg region. Taxonomic spectrum includes 25 families, the environmental spectrum is represented by mesoxerophyte - 63 species of plants, xeromesophyte - 25, xerophytes - 15 and mesophytae - 9, coenotic is restricted to steppe, meadow-steppe, forest-steppe, forest-grassland types. Flora of different variants of steppe communities formation Stipeta zalesskii includes petrophyte, halophytic, - psammophyte species of plants. In communities dominated by pottermania grasses Stipa zalesskii Wilensky., Festuca valesiaca Gaudin, Stipa capillata L., small phytocoenotic role of species among grasses and dwarf shrubs. The total projective cover in communities of the studied formations varies from 40% to 98 %, the number of species in a single description 22-42. Among the life forms of plants there are the grasses, Forbs, sedges, dwarf shrubs, shrubs. The distribution of plant communities mostly uniform, except for a small number of species growing groups. The basis of herbage and high phytomass create a high-dominant turf grasses. The largest reserves of the top phytomass identified in shallow logs and flat areas. In addition to plants with the summer period of polopoly and winter alone, there are evergreens species: some grasses and shrubs.