Using stable isotopes of water in evapotranspiration studies
2000; Wiley; Volume: 14; Issue: 8 Linguagem: Inglês
10.1002/1099-1085(20000615)14
ISSN1099-1085
Autores Tópico(s)Groundwater flow and contamination studies
ResumoHydrological ProcessesVolume 14, Issue 8 p. 1407-1421 Research Article Using stable isotopes of water in evapotranspiration studies Xue-Feng Wang, Corresponding Author Xue-Feng Wang [email protected] Department of Environmental Science and Energy Research, Weizmann Institute of Science, Rehovot 76100, IsraelOttawa-Carleton Geoscience Center, University of Ottawa, Ottawa, ON K1N 6N5, Canada===Search for more papers by this authorDan Yakir, Dan Yakir Department of Environmental Science and Energy Research, Weizmann Institute of Science, Rehovot 76100, IsraelSearch for more papers by this author Xue-Feng Wang, Corresponding Author Xue-Feng Wang [email protected] Department of Environmental Science and Energy Research, Weizmann Institute of Science, Rehovot 76100, IsraelOttawa-Carleton Geoscience Center, University of Ottawa, Ottawa, ON K1N 6N5, Canada===Search for more papers by this authorDan Yakir, Dan Yakir Department of Environmental Science and Energy Research, Weizmann Institute of Science, Rehovot 76100, IsraelSearch for more papers by this author First published: 08 June 2000 https://doi.org/10.1002/1099-1085(20000615)14:8 3.0.CO;2-KCitations: 138AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract The use of stable isotopes to estimate evapotranspiration (ET) fluxes from vegetated areas is increasing. By complementing conventional net flux measurements (gradient or eddy correlation techniques), isotope analyses can allow partitioning ET between its gross components, soil evaporation and leaf transpiration. Isotopic analyses of atmospheric water vapour above canopies can also constrain, or provide alternatives for estimating ET. A brief discussion of the isotope approach is aimed at highlighting some of the uncertainties that require further research. We also demonstrate first, the application of combined concentration and isotopic gradient analysis of atmospheric water vapour above crop fields in order to estimate ET fluxes and its gross components (soil evaporation was estimated at 1\5–3\5% of mid-day ET flux in a mature wheat field). Second, we demonstrate the potential in monitoring δss−δL, the difference between predicted and measured leaf water δ18O values, as an indicator of seasonal variations in canopy-scale transpiration in a desert ecosystem (linear correlation between this indicator and conventional ET measurements was observed). Improving our analytical capabilities for high-precision isotopic analysis of very small water vapour samples was a limiting factor in the above applications and a method for pyrolysis and on-line 18O analysis of 0\2–2 μL water samples is described. Copyright © 2000 John Wiley & Sons, Ltd. REFERENCES Allison GB. 1982. The relationship between 18O and deuterium in water in sand columns undergoing evaporation. Journal of Hydrology 55: 163–169. Allison GB, Barnes CJ. 1983. Estimation of evaporation from non-vegetated surfaces using natural deuterium. Nature 301: 143–145. Allison GB, Leaney FW. 1982. Estimation of isotopic parameters using constant-feed pans. 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