Abstract
The aim of this study was to evaluate lifespan values of trees in tree-row system in the streets of Debrecen in two years (2009 and 2017). Six selected taxa (Pyrus calleryana, Acer tataricum, Sorbus intermedia, Magnolia kobus, Acer platanoides and Crataegus x lavalleei) were estimated for the following lifespan parameters: i) trunk diameter (cm), ii) tree crown size (m), iii) trunk status (in 0-5 grades), iv) tree crown status (in 0-5 grades), and v) estimated tree viability (in 0-5 grades). Our results showed that the largest were achieved for Pyrus calleryana and the lowest for Acer tataricum. The largest tree crown diameters were achieved for Acer platanoides and the lowest Magnolia kobus. The best trunk statuses by 2017 were achieved for Pyrus calleryana and the worst Crataegus x lavalleei. The best tree crown statuses by 2017 were achieved for Pyrus calleryana and the worst for Acer tataricum. The best estimated tree viability status was achieved for two taxa (Pyrus calleryana and Acer platanoides). Overall tree values were 2.73 times higher in 2017 compared to 2009. In summary, this study demonstrated the role of appropriate choice of tree taxa for a tree-row system under city street conditions.
Highlights
Urban environment is highly dependent on the size, conditions and distributions of urban green areas within and around the cities
The largest trunk diameters were achieved for Pyrus calleryana and the lowest for Acer tataricum
The largest tree crown diameters were achieved for Acer platanoides and the lowest for Magnolia kobus
Summary
Urban environment is highly dependent on the size, conditions and distributions of urban green areas within and around the cities. Specific biological and ecological features are needed for tree species if they are decided to plant in narrow streets in towns These trees need to adopt the city various ecological conditions (e.g. air pollution, road salting, small living space) and have to have linear trunk, have to grow fast, have to have long lifespan, have to have large root system, and have to have cheap tree maintenance. These tree taxa have to have small leaves and early leaf growth (Schmidt 1988)
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