The assessment of the role of introduction in forming the adventitious flora fraction at Vo-ronezh Region protected nature reserve has been held. There 16 particularly protected nature sanctuaries of Voronezh region were taken as trial objects. They show all the range of diversity of zonal and azonal vegetable community of the region: 2 federal sanctuaries, 1 natural preserve - museum of architecture and archeology, 2 federal preserves, 1 oblast preserve and 10 regional nature memorials.
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