CERNUSAK, Lucas; BARBETA, Adrià; BUSH, Rosemary; EICHSTAEDT (BÖGELEIN), Rebekka; FERRIO, Juan; FLANAGAN, Lawrence; GESSLER, Arthur; MARTÍN-GOMEZ, Paula; HIRL, Regina; KAHMEN, Ansgar; KEITEL, Claudia; LAI, Chun‐ta; MUNKSGAARD, Niels; NELSON, Daniel; OGÉE, Jérôme; RODEN, John; SCHNYDER, Hans; VOELKER, Steven; WANG, Lixin; STUART‐WILLIAMS, Hilary; WINGATE, Lisa; YU, Wusheng; ZHAO, Liangju; CUNTZ, Matthias

doi:10.1111/nph.18113

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CERNUSAK, Lucas
James Cook University [JCU]

BARBETA, Adrià

BUSH, Rosemary
Northwestern University [Evanston]

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Article de revue

Ce document a été publié dans

New Phytologist. 2022-04-12

Wiley

Résumé en anglais

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

Mots clés en anglais

evaporative enrichment

isotopic biomarker

leaf water

relative humidity

stable isotopes

URI

https://oskar-bordeaux.fr/handle/20.500.12278/195280

DOI

http://dx.doi.org/10.1111/nph.18113

Project ANR

Recherches Avancées sur l'Arbre et les Ecosytèmes Forestiers

Origine

Importé de hal

Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391