| Autor: |
del Hierro, Andrés Miguel, Kronberger, Winfried, Hietz, Peter, Offenthaler, Ivo, Richter, Hanno |
| Předmět: |
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| Zdroj: |
Journal of Experimental Botany; Mar2002, Vol. 53 Issue 368, p559-563, 5p |
| Abstrakt: |
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. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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