Environmental and crown related factors affecting street tree transpiration in Helsinki, Finland

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http://hdl.handle.net/10138/224144

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Riikonen , A , Järvi , L & Nikinmaa , E 2016 , ' Environmental and crown related factors affecting street tree transpiration in Helsinki, Finland ' , Urban Ecosystems , vol. 19 , no. 4 , pp. 1693-1715 . https://doi.org/10.1007/s11252-016-0561-1

Title: Environmental and crown related factors affecting street tree transpiration in Helsinki, Finland
Author: Riikonen, Anu; Järvi, Leena; Nikinmaa, Eero
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Physics
University of Helsinki, Department of Forest Sciences
Date: 2016-12
Language: eng
Number of pages: 23
Belongs to series: Urban Ecosystems
ISSN: 1083-8155
URI: http://hdl.handle.net/10138/224144
Abstract: We investigated the drivers of street tree transpiration in boreal conditions, in order to better understand tree water use in the context of urban tree planning and stormwater management. Two streets built in Helsinki in 2002, hemiboreal zone that had been planted either with Tilia x vulgaris or Alnus glutinosa f. pyramidalis were used as the study sites. Tree water use was measured from sap flow over the 2008-2011 period by the heat dissipation method. Penman-Monteith based evapotranspiration models of increasing complexity were tested against the tree water use measurements to assess the role of environmental and tree related factors in tree transpiration. Alnus and Tilia respectively used 1.1 and 0.8 l of water per m(2) of leaf area per day under ample water conditions, but the annual variation was high. The Penman-Monteith evapotranspiration estimate and soil water status changes explained over 80 % of the variation in tree transpiration when the model was parameterized annually. The addition of tree crown surface area in the model improved its accuracy and diminished variation between years and sites. Using single parameterization over all four years instead of annually varying one did not produce reliable estimates of tree transpiration. Tree transpiration, scaled to different canopy cover percentages, implied that the columnar Alnus trees could transpire as much as all annual rainfall at or less than 50 % canopy cover.
Subject: Evapotranspiration
Street trees
Urban
Water use
SAP FLOW MEASUREMENTS
GLUTINOSA L. GAERTN.
SCOTS PINE FOREST
GAS-EXCHANGE
WATER-USE
STOMATAL CONDUCTANCE
DISSIPATION PROBES
CANOPY CONDUCTANCE
DECIDUOUS FOREST
URBAN TREES
4112 Forestry
1172 Environmental sciences
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