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Design and testing of twig chambers for ozone fumigation and gas exchange measurements in mature trees

Published online by Cambridge University Press:  05 December 2011

Wilhelm M. Havranek  and
Gerhard Wieser
Wilhelm M. Havranek
Affiliation:
Forstliche Bundesversuchsanstalt, Außenstelle für subalpine Waldforschung, Rennweg 1, A-6020 Innsbruck, Austria
Gerhard Wieser
Affiliation:
Forstliche Bundesversuchsanstalt, Außenstelle für subalpine Waldforschung, Rennweg 1, A-6020 Innsbruck, Austria
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Synopsis

A twig chamber system was developed for the exposure of mature trees to ozone (O3) under field conditions. The fumigation system allowed the exact control of O3 concentrations in the chambers, the measurement of O3 uptake as well as gas exchange measurements under ambient and controlled conditions during and after O3 fumigation. Because of differences in individual twigs the system should provide the exposure of replicates to different O3 treatments. Tests showed that temperature, humidity and O3 concentrations inside the chambers were comparable with diurnal courses observed in the field. Comparative gas exchange measurements indicated that there were no differences in net photosynthesis and conductance of twigs outside the chambers and twigs which remained within the chambers for 23 weeks receiving ambient air.

Type
Short Communications
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 102: Oxygen and Environmental Stress in Plants , 1994 , pp. 541 - 546
Copyright
Copyright © Royal Society of Edinburgh 1994

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