Significant difference in hydrogen isotope composition between xylem and tissue water in Populus euphratica

Zhao, Liangju, Wang, Lixin, Cernusak, Lucas A., Liu, Xiaohong, Xiao, Honglang, Zhou, Maoxian, and Zhang, Shiqiang (2016) Significant difference in hydrogen isotope composition between xylem and tissue water in Populus euphratica. Plant, Cell & Environment, 39 (8). pp. 1848-1857.

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Abstract

Deuterium depletions between stem water and source water have been observed in coastal halophyte plants and inmultiple species under greenhouse conditions. However, the location(s) of the isotope fractionation is not clear yet and it is uncertain whether deuterium fractionation appears in other natural environments. In this study, through two extensive field campaigns utilizing a common dryland riparian tree species Populus euphratica Oliv., we showed that no significant delta O-18 differences were found between water source and various plant components, in accord with previous studies. We also found that no deuterium fractionation occurred during P. euphratica water uptake by comparing the deuterium composition (delta D) of groundwater and xylem sap. However, remarkable dD differences (up to 26.4 parts per thousand) between xylem sap and twig water, root water and core water provided direct evidence that deuterium fractionation occurred between xylem sap and root or stem tissue water. This study indicates that deuterium fractionation could be a common phenomenon in drylands, which has important implications in plant water source identification, palaeoclimate reconstruction based on wood cellulose and evapotranspiration partitioning using dD of stem water.

Item ID: 46081
Item Type: Article (Refereed Research - C1)
Keywords: drylands, groundwater, hydrogen isotope, oxygen isotope, water source, xylem sap
ISSN: 1365-3040
Funders: National Science Foundation (NSF), Chinese Academy of Sciences (CAS), Program for Key Science and Technology Innovation Team
Projects and Grants: NSF 41571025, NSF 91325102, CAS Hundred Talents Program (29Y127D11), NSF IIA-1427642, NSF CAREER Award EAR-1554894
Date Deposited: 12 Oct 2016 07:35
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060705 Plant Physiology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 100%
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