4.1 Article

Plant water resource partitioning and xylem-to-leaf deuterium enrichment in Lanzhou, northwest China

Journal

WATER SUPPLY
Volume 20, Issue 3, Pages 1127-1140

Publisher

IWA PUBLISHING
DOI: 10.2166/ws.2020.045

Keywords

deuterium enrichment; Lanzhou; plant; stable isotope; water resource partitioning

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Lanzhou lies at the western Loess Plateau, China, and has a typical semi-arid temperate continental climate. Plants in this area are exposed to a prolonged dry season. In this study, we measured the stable isotopes of hydrogen (delta D) and oxygen (delta O-18) of the local precipitation, river water, soil water, plant xylem water, and leaf water at four sampling sites during the 2016 growing season. Our results showed that plants relied mostly on wet season precipitation at sites N1, N2, and N3 because this recharged the soil after the long dry season. Leaf phenology had a significant effect on evaporation distance (ED) value, and evergreen plants have adapted to water tapping from deep soil water sources during the dry season. The ED values of trees and shrubs were quite different in the dry season, indicating water competition among different plant species was mitigated due to water resource partitioning. Moreover, plants at site N4 relied on a water source admixed with river water throughout the whole growing season. The mean value of xylem-to-leaf water deuterium enrichment (e(l/x)) was -0.91 +/- 0.36 parts per thousand over all plant species, seasons, and sampling sites. Plant species, leaf phenology, and seasons were found to be the primary factors influencing the e(l/x), while growth form and elevation had negligible effects.

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