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The Patterns and Implications of Diurnal Variations in D-excess of Plant Water, Shallow Soil Water and Air Moisture : Volume 11, Issue 4 (28/04/2014)

By Zhao, L.

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Book Id: WPLBN0004012087
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: The Patterns and Implications of Diurnal Variations in D-excess of Plant Water, Shallow Soil Water and Air Moisture : Volume 11, Issue 4 (28/04/2014)  
Author: Zhao, L.
Volume: Vol. 11, Issue 4
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Zhou, M., Xiao, H., Wang, L., Cheng, G., Zhao, L., Wang, F., & Ruan, Y. (2014). The Patterns and Implications of Diurnal Variations in D-excess of Plant Water, Shallow Soil Water and Air Moisture : Volume 11, Issue 4 (28/04/2014). Retrieved from

Description: Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China. Deuterium excess (d-excess) of air moisture is traditionally considered as a conservative tracer of oceanic evaporation conditions. Recent studies challenge this view and emphasize the importance of vegetation activity in controlling the dynamics of air moisture d-excess. However direct field observations supporting the role of vegetation in d-excess variations is not well documented. In this study, we quantified d-excess of air moisture, leaf and xylem water of multiple dominant species as well as shallow soil water (5 and 10 cm) at hourly interval during three extensive field campaigns at two climatically different locations within the Heihe River Basin. The results showed that with the increase of temperature (T) and decrease of relative humidity (RH), the δD-δ18O plots of leaf water, xylem water and shallow soil water deviated gradually from their corresponding local meteoric water line. There were significant differences in d-excess values among different water pools at all the study sites. The most positive d-excess values were found in air moisture (9.3‰) and the most negative d-excess values (−85.6‰) were found in leaf water. The d-excess values of air moisture (dmoisture) and leaf water (dleaf) during the sunny days, and shallow soil water (dsoil) during the first sunny day after rain event showed strong diurnal patterns. There were significantly positive relationships between dleaf and RH and negative relationships between dmoisture and RH. The correlations of dleaf and dmoisture with T were opposite to their relationships with RH. In addition, we found the opposite diurnal variations for dleaf and dmoisture during the sunny day, and for dleaf during the sunny days, and shallow soil water dsoil and dmoisture during the first sunny day after rain event. Significant negative relationships were found between dleaf and dmoisture in all the sites during the sunny day. Our results provide direct evidence that dmoisture of the surface air at continental locations can be significantly altered by local processes, especially plant transpiration during the sunny days. The role of shallow soil water on dmoisture is generally much smaller but could be large at the sunny day right after rainfall events.

The patterns and implications of diurnal variations in d-excess of plant water, shallow soil water and air moisture

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