Journal Title
Title of Journal: Urban Ecosyst
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Abbravation: Urban Ecosystems
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Authors: M A Rahman D Armson A R Ennos
Publish Date: 2014/08/09
Volume: 18, Issue: 2, Pages: 371-389
Abstract
It is often claimed that evapotranspiration from urban trees can mitigate the urban heat island and adapt our cities to climate change however the relative effectiveness of different tree species has rarely been investigated The current study addressed this shortcoming by comparing the growth and physiology of five commonly planted tree species Sorbus arnoldiana Crataegus laevigata Malus ‘Rudolph’ Pyrus calleryana and Prunus ‘Umineko’ The study was conducted between March and November 2011 in eight different streets of Manchester UK where trees had been growing for 6 years in the same growing conditions The study showed that evapotranspirational cooling is closely related to the growth and stress tolerance of tree species Of the species tested Prunus ‘Umineko’ and P calleryana were the fastest growing and Malus ‘Rudolph’ was the slowest growing In general faster growing species showed higher leaf area index LAI and higher stomatal conductivity and so provided more cooling However Prunus ‘Umineko’ had surprisingly low cooling and showed signs of drought stress P calleryana showed up to 100 higher stomatal conductance than the other tree species Combining the higher LAI and wider canopy P calleryana and C laevigata provided cooling up to 22 kW tree−1 3 to 4 times of cooling to that of Prunus ‘Umineko’ and S arnoldiana and showed no signs of drought stress Malus ‘Rudolph’ showed stress tolerance but provided low cooling Prunus ‘Umineko’ and S arnoldiana with their thin and sparse canopy provided low cooling and showed susceptibility to urban stressThis project was supported by a doctoral grant funded by the Sustainable Consumption Institute SCI University of Manchester and the European Union INTERREG IVB fund as part of the VALUE project Thanks are due to Red Rose Forest for providing the initial growth data and to Dr Giles Johnson for his cordial help during the experiment Special thanks to Mr Samuel Partey Mr David Arregui Mr William Park and Dr James Gardiner for all their help
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