Abstract
Enriching the flora of the region’s cities with environmentally effective, sustainable and aesthetically attractive green spaces is very important. The study of urban green spaces (both native and introduced species) with an assessment of their resistance to the complex of stress factors of the urban environment is of important scientific and practical importance. Moreover, in Sochi, comprehensive studies of ecological and biological features of tree crops have not been conducted before. The article presents the results of research on the ecological and biological features of a number of promising tree crops in urban greening. The issues of changing the content of green pigments and evaluating the chlorophyll fluorescence in leaves are considered. Eight species that are most used in urban landscaping as research objects have been selected. Streets with the greatest length and intensity of anthropogenic factor (characterized by significant automobile traffic) as «stressful» observation points were chosen. Kuban Subtropical Botanical garden (KSBG) and the park «Dendrarium» are zones of conditional control territories. It is shown that plants are characterized by different content of green pigments. This fact should be taken into account when analyzing the ecological contribution of green spaces to the optimization of the urban environment. According to the level of variability in the content of chlorophyll, the studied species of woody plants can be placed in the following row: Jasminum mesnyi > Ligustrum lucidum and Eriobotrya japonica > Prunus laurocerasus > Nerium oleander > Cinnamomum camphora > Laurus nobilis and Magnolia grandiflora > Aucuba japonica > Viburnum tinus. It was found that the content of pigments in leaves in areas of the most intensive traffic is significantly lower (LSD (p ≤0.05) = 0.53 – 0.97 depending on the breed) compared to plants selected in the zones of conditional control. It is shown that total content of pigments not`s important, as their ratio In the zone of conditional control (ZCC), the amount of chlorophyll a in comparison with chlorophyll b is significantly higher (LSD (p ≤0.05) = 0.68) than in the «stress» observation points. The stationary fluorescence level (F_T), the viability level (Fm/F_T), the photosynthetic activity index using the extrapolation algorithm (Kf_T), and the photosynthetic activity index calculated at each current measurement point (Kf_n) were evaluated. It was revealed that L. nobilis, N. oleander, J. mesnyi, C. camphora, and E. japonica are plants with the highest photosynthetic activity. In species with a busy transport load, the stationary level of fluorescence is lower, which indicates a decrease in plant viability.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
