Analysis of the spontaneous element of Kryvyi Rih green areas and invasive activity of introduced species
Kryvyi Rih Botanical Garden, NAS of Ukraine
50, Marshak St., Kryvyi Rih 50089, Ukraine
In a spontaneous vegetation of green areas of seven administrative regions of Kryvyi Rih 565 species of plants from 324 genera and 86 families are recorded. The greatest floristic wealth allocates park areas of northern districts – Ternivskyi and Zhovtnevyi where grow 456 and 411 species, respectively, smallest – the southern districts of the city – Dzerzhynskyi and Inhuletskyi, respectively, 227 and 234 species. Reduction of species wealth from the north to the south is one of confirmations, from the one side, of influence of a zonal location of green plantations, from another – bigger recreational and economic loading to the natural vegetation in the southern part of the city. The carried-out structural and comparative analysis of species structure indicates its considerable level of synanthropization and adventization. In particular, in a biomorphic range, compared with flora of the city in general, bigger quantity of the herbaceous monocarpic which have tap root system and wood plants, and also species without specialized underground shoots. In an ecological range prevail hemieurytopic and eurytopic synanthropic species – 47.8%, among which high percent of therophytes. It is established that in the spontaneous element of green areas the share of the alien species makes 35.8%, i.a. 202 species from 152 genera and 54 families. The majority of introduced species which are used in green areas and can spread spontaneously, do not constitute a threat of invasion. It is recommended to pay attention to the spread of a number of species with high (8 species) and very high (19 species) invasive activity and to restrict their usage in the creation of park and other green areas.
Keywords: green areas, introduced species, spontaneous vegetation, alien species, invasive species