Articles | Volume 23, issue 6
https://doi.org/10.5194/hess-23-2581-2019
https://doi.org/10.5194/hess-23-2581-2019
Research article
 | 
14 Jun 2019
Research article |  | 14 Jun 2019

The 18O ecohydrology of a grassland ecosystem – predictions and observations

Regina T. Hirl, Hans Schnyder, Ulrike Ostler, Rudi Schäufele, Inga Schleip, Sylvia H. Vetter, Karl Auerswald, Juan C. Baca Cabrera, Lisa Wingate, Margaret M. Barbour, and Jérôme Ogée

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Latest update: 25 Dec 2024
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Short summary
We evaluated the system-scale understanding of the propagation of the oxygen isotope signal (δ18O) of rain through soil and xylem to leaf water in a temperate drought-prone grassland. Biweekly δ18O observations of the water pools made during seven growing seasons were accurately reproduced by the 18O-enabled process-based model MuSICA. While water uptake occurred from shallow soil depths throughout dry and wet periods, leaf water 18O enrichment responded to both soil and atmospheric moisture.