The impact of design on the environmental contribution of street trees in Kallithea, Athens
In landscape design appropriate placing and spacing of trees on streets provide a variety of benefits. Global warming has contributed in learning more about the negative impacts of treeless urban streets. Athens, Greece like many other European Mediterranean countries is often characterised by narrow streets, as well as the concurrent use of streets for utility lines and lamp posts. In such cases, the presence of trees enhance further the problems related to the small street size. In general, the opinion of the lay public and the green space management authorities of the municipalities appear to be divided towards the preservation or not of mature trees on these "problematic" streets. A quantification of the environmental benefits of the presence of trees on such streets could possibly support the need for their preservation and inform future designs of streets with trees. The early results of a study to determine the environmental benefits of trees on streets that have raised concerns in the municipality of Kallithea, Athens are presented. The ambient temperature, physiologically equivalent temperature, as well as the particulate pollution capture by Citrus aurantium and Olea europaea trees and the accumulation of heavy metals pollutants in soil and plants on selected streets were determined. In general, streets with two mixed, C. aurantium and O. europaea, tree species showed lower ambient and physiologically equivalent temperatures than streets containing only one tree species, while O. europeae was more effective in particulate matter capture.
Alevizos, I., Paraskevopoulou, A.T., Kamoutsis, A., Psychogiou, M. and Londra, P. (2017). The impact of design on the environmental contribution of street trees in Kallithea, Athens. Acta Hortic. 1189, 251-256
urban landscape, thermal comfort, particulate matter, heavy metals