Premium
Significant Difference in Hydrogen Isotope Composition Between Xylem and Tissue Water in Populus Euphratica
Author(s) -
Zhao Liangju,
Wang Lixin,
Cernusak Lucas A.,
Liu Xiaohong,
Xiao Honglang,
Zhou Maoxian,
Zhang Shiqiang
Publication year - 2016
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12753
Subject(s) - xylem , populus euphratica , halophyte , fractionation , deuterium , isotope fractionation , chemistry , botany , salinity , biology , ecology , physics , organic chemistry , quantum mechanics
Deuterium depletions between stem water and source water have been observed in coastal halophyte plants and in multiple 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 δ 18 O 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 (δD) of groundwater and xylem sap. However, remarkable δD differences (up to 26.4‰) 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 δD of stem water.