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

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

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We compiled hydrogen and oxygen stable isotope compositions (δ2H and δ18O) of leaf water from multiple biomes to examine variations with environmental drivers. Leaf water δ2H was more closely correlated with δ2H of xylem water or atmospheric vapour, whereas leaf water δ18O was more closely correlated with air relative humidity. This resulted from the larger proportional range for δ2H of meteoric waters relative to the extent of leaf water evaporative enrichment compared with δ18O. We next expressed leaf water as isotopic enrichment above xylem water (Δ2H and Δ18O) to remove the impact of xylem water isotopic variation. For Δ2H, leaf water still correlated with atmospheric vapour, whereas Δ18O showed no such correlation. This was explained by covariance between air relative humidity and the Δ18O 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 2H and 18O 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.

Item ID: 73770
Item Type: Article (Research - C1)
ISSN: 1469-8137
Keywords: evaporative enrichment, isotopic biomarker, leaf water, relative humidity, stable isotopes
Copyright Information: © 2022 The Authors New Phytologist. © 2022 New Phytologist Foundation. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date Deposited: 11 May 2022 08:14
FoR Codes: 31 BIOLOGICAL SCIENCES > 3108 Plant biology > 310806 Plant physiology @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences @ 100%
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