Do 2H and 18O in leaf water reflect environmental drivers differently?

Cernusak, Lucas A. and Barbeta, Adrià and Bush, Rosemary T. and Eichstaedt Bögelein, Rebekka and Ferrio, Juan Pedro and Flanagan, Lawrence B. and Gessler, Arthur and Martín-Gómez, Paula and Hirl, Regina T. and Kahmen, Ansgar and Keitel, Claudia and Lai, Chun-Ta and Munksgaard, Niels C. and Nelson, Daniel B. and Ogée, Jérôme and Roden, John S. and Schnyder, Hans and Voelker, Steven L. and Wang, Lixin and Stuart-Williams, Hilary and Wingate, Lisa and Yu, Wusheng and Zhao, Liangju and Cuntz, Matthias. (2022) Do 2H and 18O in leaf water reflect environmental drivers differently? The New phytologist, 235 (1). pp. 41-51.

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Official URL: https://edoc.unibas.ch/89272/

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We compiled hydrogen and oxygen stable isotope compositions (δ2 H and δ18 O) of leaf water from multiple biomes to examine variations with environmental drivers. Leaf water δ2 H was more closely correlated with δ2 H of xylem water or atmospheric vapour, whereas leaf water δ18 O was more closely correlated with air relative humidity. This resulted from the larger proportional range for δ2 H of meteoric waters relative to the extent of leaf water evaporative enrichment compared with δ18 O. We next expressed leaf water as isotopic enrichment above xylem water (Δ2 H and Δ18 O) to remove the impact of xylem water isotopic variation. For Δ2 H, leaf water still correlated with atmospheric vapour, whereas Δ18 O showed no such correlation. This was explained by covariance between air relative humidity and the Δ18 O of atmospheric vapour. This is consistent with a previously observed diurnal correlation between air relative humidity and the deuterium excess of atmospheric vapour across a range of ecosystems. We conclude that 2 H and 18 O in leaf water do indeed reflect the balance of environmental drivers differently; our results have implications for understanding isotopic effects associated with water cycling in terrestrial ecosystems and for inferring environmental change from isotopic biomarkers that act as proxies for leaf water.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Kahmen, Ansgar
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Aug 2022 12:21
Deposited On:30 Aug 2022 12:21

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