A new method to determine the oxygen concentration inside the sapwood of trees |
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Authors: | del Hierro Andrés Miguel Kronberger Winfried Hietz Peter Offenthaler Ivo Richter Hanno |
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Institution: | Institut für Botanik, Universit?t für Bodenkultur Wien, Gregor Mendel Str. 33, A-1180 Wien, Austria. adelhier@edv1.boku.ac.at |
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Abstract: | 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. |
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