First real-time measurement of the evolving 2H/1H ratio during water evaporation from plant leaves |
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Authors: | Kerstel Erik R T Wel L Gerko van der Meijer Harro A J |
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Institution: | CIO-Center for Isotope Research, University of Groningen, Nijenborgh, 4, 9747, AG Groningen, The Netherlands. e.r.t.kerstel@rug.nl |
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Abstract: | We have studied the temporal behaviour of the deuterium isotope ratio of water vapour emerging from a freshly cut plant leaf placed in a dry nitrogen atmosphere. The leaf material was placed directly inside the sample gas cell of the stable isotope ratio infrared spectrometer. At the reduced pressure ( approximately 40 mbar) inside the cell, the appearance of water evaporating from the leaf is easily probed by the spectrometer, as well as the evolving isotope ratios, with a precision of about 1 per thousand. The demonstration experiment we describe measures the 2H/1H isotope ratio only, but the experiment can be easily extended to include the 18O/16O and 17O/16O isotope ratios. Plant leaf water isotope ratios provide important information towards quantification of the different components in the ecosystem water and carbon dioxide exchange. |
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