Halevych O. Biological and ecological principles of formation of vegetation compositions of flat extensive green roofs (the case of the city of Lviv).

The object of research is the species composition of cultivated and spontaneous flora of flat green roofs of extensive type in the conditions of the city of Lviv. The purpose of the research was to analytically study the composition and structure of the cultivated flora of green roofs in Lviv and to experimentally develop the scientific basis for selecting a range of plants for landscaping of flat roofs of extensive type according to bioecological characteristics of species. Research methods - general scientific; inventory; bioecological; floristic; dendrological; ecological; soil science; phenological; spectrophotometric. Scientific novelty - inventory and analysis of cultivated flora of flat green roofs of Lviv, systematic, biomorphological, ecological and chorological characteristics of 326 species, hybrids and cultivars from 55 families and 143 genera successfully acclimatized on green roofs; an inventory and analysis were carried out, the diaspora-horn structure of the spontaneous flora (59 species from 19 families) was studied and it was found that polycarpic anemochoric hemicryptophytes predominate among weeds on roofs, and sterilization of the substrate is insufficient to control them; experimentally isolated stable plant species, established environmental factors - triggers of phenophases, and statistically proved that 98% of fluctuations of phenodate in plants are due to the simultaneous influence of roof height, air temperature and precipitation. Practical meaning. The research results make it possible to significantly adjust landscaping techniques, improve agricultural techniques and reduce the cost of installation and care of roofing. The obtained multiple regression equations represent mathematical models of phenological phases, suitable for use as an ecological-phenological forecast for landscaping roofs of different heights. Scope of application: landscape gardening.