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International Journal of Biometeorology

, Volume 60, Issue 1, pp 159–172 | Cite as

Transpiration of urban trees and its cooling effect in a high latitude city

  • Janina Konarska
  • Johan Uddling
  • Björn Holmer
  • Martina Lutz
  • Fredrik Lindberg
  • Håkan Pleijel
  • Sofia Thorsson
Original Paper

Abstract

An important ecosystem service provided by urban trees is the cooling effect caused by their transpiration. The aim of this study was to quantify the magnitude of daytime and night-time transpiration of common urban tree species in a high latitude city (Gothenburg, Sweden), to analyse the influence of weather conditions and surface permeability on the tree transpiration, and to find out whether tree transpiration contributed to daytime or nocturnal cooling. Stomatal conductance and leaf transpiration at day and night were measured on mature street and park trees of seven common tree species in Gothenburg: Tilia europaea, Quercus robur, Betula pendula, Acer platanoides, Aesculus hippocastanum, Fagus sylvatica and Prunus serrulata. Transpiration increased with vapour pressure deficit and photosynthetically active radiation. Midday rates of sunlit leaves ranged from less than 1 mmol m−2 s−1 (B. pendula) to over 3 mmol m−2 s−1 (Q. robur). Daytime stomatal conductance was positively related to the fraction of permeable surfaces within the vertically projected crown area. A simple estimate of available rainwater, comprising of precipitation sum and fractional surface permeability within the crown area, was found to explain 68 % of variation in midday stomatal conductance. Night-time transpiration was observed in all studied species and amounted to 7 and 20 % of midday transpiration of sunlit and shaded leaves, respectively. With an estimated night-time latent heat flux of 24 W m−2, tree transpiration significantly increased the cooling rate around and shortly after sunset, but not later in the night. Despite a strong midday latent heat flux of 206 W m−2, a cooling effect of tree transpiration was not observed during the day.

Keywords

Latent Heat Flux Vapour Pressure Deficit Street Canyon Permeable Surface Shade Leave 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The project was funded by the Swedish Research Council Formas (259-2012-887 and 214-2010-1706), Swedish Transport Administration and Mistra Urban Futures. Special thanks are due to Malin Löfstrand and Elise Nässén for permission to conduct measurements in Trädgårdsföreningen and Stampen Parks, respectively, as well as to Thomas Berg Hasper and Ignacio Ruíz Martinez for help with the measurements.

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Copyright information

© ISB 2015

Authors and Affiliations

  • Janina Konarska
    • 1
  • Johan Uddling
    • 2
  • Björn Holmer
    • 1
  • Martina Lutz
    • 2
  • Fredrik Lindberg
    • 1
  • Håkan Pleijel
    • 2
  • Sofia Thorsson
    • 1
  1. 1.Department of Earth SciencesUniversity of GothenburgGothenburgSweden
  2. 2.Department of Biological and Environmental SciencesUniversity of GothenburgGothenburgSweden

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