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Journal of Experimental Botany, Vol. 53, No. 368, pp. 559-563, March 1, 2002
© 2002 Oxford University Press

A new method to determine the oxygen concentration inside the sapwood of trees

Andrés Miguel del Hierro1, Winfried Kronberger, Peter Hietz, Ivo Offenthaler and Hanno Richter

Institut für Botanik, Universität für Bodenkultur Wien, Gregor Mendel Str. 33, A-1180 Wien, Austria

Research into the short-term fluctuations of oxygen concentrations in tree stems has been hampered by the difficulty of measuring oxygen inside tissues. A new method, which is based on fluorescence quenching of a ruthenium complex in the presence of oxygen, has been applied to measure changes of oxygen concentration in the sapwood of trees. During a field day-course oxygen increased with the radiation load and fell during the night (in Fagus orientalis from 20.3% in the afternoon to 17.5% in the morning next day). In a greenhouse experiment the sapwood oxygen concentration of Laurus nobilis could be influenced by flooding the root system. The very fast response, high resolution (better than 0.1%), easy calibration, and dependence only on oxygen and temperature make the technique well suited for measurements of oxygen concentrations in the sapwood.

Key words: Fibre optic oxygen probe, oxygen concentration, sapwood, transpiration.


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