Introductive populations of plants in the meadow-steppes of culturphytocoenoses

The outcomes of analysis of series introductive populations in the artificial meadow steppes phytocoenoses on the botanical geographic plot "Steppes of Ukraine" of M.M. Grishko National Botanical Gardens of the NAS of Ukraine are presented. The main specifications of introductive populations are described. The efficiency of preservation of rare species ex situ is showed by model of their populations in the meadow steppes of culturphytocoenoses