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Journal of Arid Land  2026, Vol. 18 Issue (4): 676-695    DOI: 10.1016/j.jaridl.2026.04.007     CSTR: 32276.14.JAL.20250453
Research article     
Identification of dominant plant water-use strategies in arid zones under deuterium depletion conditions
DAI Ningze1,2,3, SHI Fengzhi1,2,3,*(), WANG Yuehui4, YAO Peng1,2,3, ZHU Jianting5, ZHAO Chengyi6
1 State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
2 Aksu National Station of Observation and Research for Oasis Agro-ecosystem, Aksu 843017, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
4 Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
5 Department of Civil and Architectural Engineering, University of Wyoming, Laramie, WY 82071, USA
6 School of Geographical Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China
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Abstract  

Identifying plant water sources is fundamental for elucidating ecohydrological processes and improving water resource management in arid zones under climate change. Stable hydrogen and oxygen isotopes are commonly used to trace plant water uptake; however, cryogenic vacuum extraction (CVE), the standard method for extracting plant xylem water, may induce deuterium depletion, thereby biasing source attribution. To systematically assess the effects of CVE-induced deuterium depletion across species, size classes, and habitats, we excavated five representative soil profiles along the mainstream of the Tarim River in northwestern China, in mid-July 2022. A total of 29 individuals, comprising both Populus euphratica and Tamarix ramosissima, were sampled. We divided P. euphratica individuals into four groups based on diameter at breast height (<50, 50-100, 100-250, and >250 cm), while categorized T. ramosissima individuals into four groups according to plant height (<1.0, 1.0-2.0, 2.0-4.0, and >4.0 m). Plant xylem water was extracted using CVE, and five deuterium depletion scenarios (-5.00‰, -7.00‰, -9.00‰, -11.00‰, and -13.00‰) were simulated. The Bayesian Mixing Model for Stable Isotope Analysis in R (MixSIAR) was applied under six input modes to quantify the proportional contributions of potential water sources and associated prediction errors. Model evaluation revealed that P. euphratica achieved the highest accuracy with a -9.00‰ correction of depletion, whereas a -11.00‰ correction was optimal for T. ramosissima, reducing relative prediction errors by 68.65% and 67.73%, respectively, compared with uncorrected scenario. Small-sized P. euphratica individuals exhibited less deuterium depletion, whereas no clear size-dependent pattern was observed for T. ramosissima. Spatially, plant individuals located farther from the river exhibited reduced deuterium depletion in xylem water. Despite differences in species traits and habitat conditions, both species predominantly relied on deep soil water and groundwater, which together contributed, on average, 61.45% and 59.95% for P. euphratica and T. ramosissima, respectively. These findings highlight the necessity of accounting for CVE-induced deuterium depletion when identifying plant water-use strategies and provide methodological guidance for isotope-based ecohydrological studies in arid environments.



Key wordsplant water uptake      hydrogen isotopes      oxygen isotopes      cryogenic vacuum extraction (CVE)      deuterium depletion      Bayesian Mixing Model for Stable Isotope Analysis in R (MixSIAR)      Tarim River Basin     
Received: 14 September 2025      Published: 30 April 2026
Corresponding Authors: *SHI Fengzhi (E-mail: shifz@ms.xjb.ac.cn)
Cite this article:

DAI Ningze, SHI Fengzhi, WANG Yuehui, YAO Peng, ZHU Jianting, ZHAO Chengyi. Identification of dominant plant water-use strategies in arid zones under deuterium depletion conditions. Journal of Arid Land, 2026, 18(4): 676-695.

URL:

http://jal.xjegi.com/10.1016/j.jaridl.2026.04.007     OR     http://jal.xjegi.com/Y2026/V18/I4/676

Fig. 1 Overview of the study area based on the digital elevation model (DEM; a), and field photographs showing the soil profiles at Alaer (b), Ermuchang (c), Yingbazha (d), Aqike (e), and Yingsu (f)
Plant type Group Profile DBH (cm) Height (m)
Populus euphratica P1 Ermuchang 25 /
Yingbazha 15 /
Yingsu 15 /
P2 Alaer 80 /
Yingbazha 50 /
Aqike 50 /
Aqike 60 /
Yingsu 70 /
Alaer 100 /
P3 Alaer 150 /
Ermuchang 235 /
Yingbazha 120 /
Aqike 100 /
Yingsu 175 /
P4 Alaer 370 /
Tamarix ramosissima T1 Aqike / 0.8
Alaer / 1.0
Ermuchang / 1.0
T2 Yingbazha / 1.8
Aqike / 1.5
Yingsu / 1.5
Yingsu / 1.2
T3 Alaer / 2.0
Ermuchang / 2.5
Ermuchang / 3.0
Yingbazha / 2.5
Yingsu / 2.5
Yingsu / 2.5
T4 Yingsu / 4.0
Table 1 Plant sampling information
Fig. 2 Soil water content distribution across five soil profiles. (a), Alaer; (b), Ermuchang; (c), Yingbazha; (d), Aqike; (e), Yingsu.
Fig. 3 Soil texture distribution across five profiles. (a), Alaer; (b), Ermuchang; (c), Yingbazha; (d), Aqike; (e), Yingsu.
Fig. 4 Relationship between oxygen isotope ratio (δ18O) and deuterium isotope ratio (δD) of different water sources. The local meteoric water line (LMWL) (Song et al., 2022) and global meteoric water line (GMWL) are shown for reference.
Fig. 5 δ18O and δD values of soil water and plant xylem water at different profiles. Panels (a), (b), (c), (d), and (e) correspond to the Alaer, Ermuchang, Yingbazha, Aqike, and Yingsu profiles, respectively. Panels a1-e1 show δ18O, while panels a2-e2 display δD. P1-P4 represent four groups of P. euphratica individuals based on diameter at breast height (DBH): <50, 50-10, 100-250, and >250 cm, respectively. T1-T4 represent four groups of T. ramosissima individuals based on plant height: <1.0, 1.0-2.0, 2.0-4.0, and >4.0 m, respectively. The asterisk symbol ''*'' denotes different individual plants within the same group. Error bars represent standard deviations.
Fig. 6 Bayesian Mixing Model for Stable Isotope Analysis in R (MixSIAR) predictions of plant water sources at the Alaer (a), Ermuchang (b), Yingbazha (c), Aqike (d), and Yingsu (e) profiles under different correction scenarios. F0, original δD and δ18O values; F5, δD and δ18O values were adjusted for -5.00‰ deuterium depletion; F7, δD and δ18O values were adjusted for -7.00‰ deuterium depletion; F9, δD and δ18O values were adjusted for -9.00‰ deuterium depletion; F11, δD and δ18O values were adjusted for -11.00‰ deuterium depletion; F13, δD and δ18O values were adjusted for -13.00‰ deuterium depletion. Error bars represent standard deviations.
Plant type Statistical indicator F0 F5 F7 F9 F11 F13
Populus euphratica RMSE (‰) 10.34 5.42 3.84 3.05 3.17 3.02
NSE -3.65 -0.28 0.36 0.60 0.56 0.51
MAPE (%) 12.25 6.69 4.75 3.84 3.73 3.52
Tamarix ramosissima RMSE (‰) 14.30 9.71 8.26 7.19 6.29 5.91
NSE -4.09 -1.35 -0.70 -0.29 0.02 -0.63
MAPE (%) 15.43 9.19 7.37 5.98 4.98 5.10
Table 2 RMSE, NSE, and MAPE of δD from the MixSIAR predictions under different correction scenarios
Fig. 7 Heatmaps of three statistical metrics—RMSE (root mean square error), NSE (Nash-Sutcliffe efficiency), and MAPE (mean absolute percentage error)—evaluated under different δD correction scenarios across soil profiles and plant groups. (a), RMSE differentiated by soil profile; (b), RMSE differentiated by plant group; (c), NSE differentiated by soil profile; (d), NSE differentiated by plant group; (e), MAPE differentiated by soil profile; (f), MAPE differentiated by plant group.
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