Shepeliuk M. The dendroflora of Lutsk: formation, species composition, biological and ecological peculiarities

The dissertation presents the results of analysis and evaluation of species composition, phytosanitary state, biological and ecological peculiarities of dendro-diversity of Lutsk planting. Since there are no fundamental comprehensive researches of tree diversity of different categories plantings, no registration and monitoring system of urban plants, inventory and assessment of the phytosanitary state of the dendroflora of Lutsk are revelant. In the dissertation, according to literary and archival sources, historical and stylistic genesis of greening development of the city is shown. The specified periodization of the formation of dendro-diversity is presented and the modern stage is described in details. The problems with the preservation of the existing general urban plantings in good state and gradual reduce of green areas are currently observed there. For the first time, an every single tree inventory of city plantings of different functional uses was conducted. Dominant species of trees and shrubs of different plantings groups and the presence of hedges and vertical gardening in landscaping of Lutsk were reviled. During the dissertation researches the phytosanitary state of plantings was determined; the most common fauna, diseases and insects pests of trees were studied. Due to the uneven impact of urban factors on the development of green plants in different ecological zones of growth, the phenological observations of urban ecosystem engineer plants for seasonal rhythm of growth and development were conducted. The results of determining the functional state of plants leaves of tree species by chlorophyll fluorescence induction method were shown. The frost resistance of promising introduced species for urban conditions of Lutsk was established by the method of direct laboratory freezing. The dynamics of changes in the edaphic conditions of the city territory was marked. The dissertation presents the results of experimental studies of heavy metals content in soils of the city, which show a significant excess of lead, cadmium and zinc in the city center and near the main highways. The changes of species composition and its state during the last decade of formation, that reflecting the modern reduction of areas of recreational zones and the dynamics of dendro-diversity were analyzed.