Use of 2H and 18O stable isotopes to investigate water sources for different ages of Populus euphratica along the lower Heihe River

Ecological Research
By: , and 

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Abstract

Investigation of the water sources used by trees of different ages is essential to formulate a conservation strategy for the riparian tree, P. euphratica. This study addressed the contributions of different potential water sources to P. euphratica based on levels of stable oxygen and hydrogen isotopes (δ18O, δ2H) in the xylem of different aged P. euphratica, as well as in soil water and groundwater along the lower Heihe River. We found significant differences in δ18O values in the xylem of different aged P. euphratica. Specifically, the δ18O values of young, mature and over-mature forests were −5.368(±0.252) ‰, −6.033(± 0.185) ‰ and −6.924 (± 0.166) ‰, respectively, reflecting the reliance of older trees on deeper sources of water with a δ18O value closer to that of groundwater. Different aged P. euphratica used different water sources, with young forests rarely using groundwater (mean <15 %) and instead primarily relying on soil water from a depth of 0–50 cm (mean >45 %), and mature and over-mature forests using water from deeper than 100 cm derived primarily from groundwater.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Use of 2H and 18O stable isotopes to investigate water sources for different ages of Populus euphratica along the lower Heihe River
Series title Ecological Research
DOI 10.1007/s11284-015-1270-6
Volume 30
Issue 4
Year Published 2015
Language English
Publisher Springer Japan
Contributing office(s) Fort Collins Science Center
Description 7 p.
First page 581
Last page 587
Country China
Other Geospatial Lower Heihe River
Online Only (Y/N) N
Additional Online Files (Y/N) N