Rare diversity of forest vegetation of the steppe zone: current state, threats and directions of changes

Under the action of various forms human activity, there was a violation integrity and unity vegetation cover steppe zone Ukraine. The consequence this is fragmentation vegetation. It established that decrease in area plant communities leads to an increase their dependence on environmental factors. An important component phytocoenotic cover, first all forest which biotic basis functioning biosphere, its evolution maintenance ecologically balanced state, rare phytocoenofund. purpose work compile information current state groups using data from ecological coenotic studies, sociological analysis assessment latest threats diversity. A critical phytocenophyte, modern synphytosozological studies geobotanical phytocenotic diversity made it possible establish phytocenophyte forests has 16 associations three formations. showed phytocoenoses are characterized by type association, located border range, 5 formed endemic species. According status, they divided into (4 associations) endangered species (12 associations). potential for natural recovery populations dominant specific conditions very weak or associations. Currently, most negatively affected due complete loss habitats, pollution, overexploitation ecosystems, competition adventive species, global climate change unbalanced development forestry, military actions.