Abstract
It is impossible to overestimate the importance of parks in large industrial cities. The problem of preservation of local flora together with cultivation of introduced species is more actual. The species composition of seed self-restoration of woody plants in the forest park and park parts of the Botanical Garden of Oles Honchar Dnipro National University was analyzed in order to determine the ratio of introduced and autochthonous species and whether the introduced species pose a threat to aboriginal flora. Quantitative and qualitative state of seed self-restoration determined. As a result of the research it was established that in the forest-park and park zones of the Botanical Garden artificial stands are capable of forming a sufficient number of viable undergrowth of autochthonous and introduced species, among which mainly aboriginal species dominate. The ratio of indigenous species to introduced ones in different parts of the park and forest park is 57–76 % and 24–43 %, respectively. There is no special competition between indigenous and introduced species. Each species of woody species has adapted well to the conditions of the ecotope and to the conditions of its place of growth. Bioecological features of wood species in the plantations are not an obstacle to the development of the internal space of the ecotope, but 43 % of self-regenerating woody plants in trial area 1 are introduced species, so further observation is needed.
Highlights
The role of parks in large cities is invaluable
The issue of acclimatization and introduction of plants has always interested scientists and it is found that Ukraine has significant success in the introduction and acclimatization of woody plants and the number of introduced into Ukraine species of trees and shrubs is several times higher than the number of aboriginal species that make up natural dendroflora (Kohno, 2007)
The height of the upper tier of the crowns of woody plant species in the stand is sometime 15–20 m. These are artificially planted plants of common robinia, ash maple, common hackberry, which make up 12 % of the total number of woody plants of the trial area 1 and are about 70–73 years old
Summary
The role of parks in large cities is invaluable. The anthropogenic impact on the environment threaten the city's ecosystem, and the most pressing issue is the preservation of flora, which components are the best medicine for human health and the main treasure of life, what the physician and philosopher Avicenna stated a thousand years ago.The vegetation of parks performs many functions, improving the ecological situation: cleaning and humidifying the air, regulating the thermal regime of the city, which is very important in large industrial cities, and combining health and aesthetic factors to meet people's leisure needs.the preservation of green areas in cities, in particular parks, is an important condition for creating a favorable urban environment in connection with significant anthropopressing.When arranging parks, it is impossible to avoid exotic species (introduced species) for a certain area. The vegetation of parks performs many functions, improving the ecological situation: cleaning and humidifying the air, regulating the thermal regime of the city, which is very important in large industrial cities, and combining health and aesthetic factors to meet people's leisure needs. The preservation of green areas in cities, in particular parks, is an important condition for creating a favorable urban environment in connection with significant anthropopressing. It is impossible to avoid exotic species (introduced species) for a certain area. The issue of acclimatization and introduction of plants has always interested scientists and it is found that Ukraine has significant success in the introduction and acclimatization of woody plants and the number of introduced into Ukraine species of trees and shrubs is several times higher than the number of aboriginal species that make up natural dendroflora (Kohno, 2007)
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