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<p>Stable isotopes are widely used to investigate plant-water interactions, yet many studies report differences in deuterium (δ<sup>2</sup>H) ratios between plants and source waters (termed δ<sup>2</sup>H offsets). These δ<sup>2</sup>H offsets challenge the assumption that water uptake and transport in plants do not alter the isotopic composition of water. Here, we develop a conceptual framework that distinguishes three soil water pools and two plant water pools based on water potential. We synthesize data from 110 published studies across 212 field sites worldwide and reanalyze 6333 δ<sup>2</sup>H offset measurements using possible source water lines. We find that δ<sup>2</sup>H offsets are absent when using appropriate water pools (e.g., use sap flow water rather than bulk xylem tissue water to represent plant water), with mean offsets not statistically different from zero. We argue that accurately separating correct water pools from bulk water pools in soils and plants is key to reconciling the observed δ<sup>2</sup>H offsets.</p>

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Demystifying stable hydrogen isotope offsets between plants and source waters

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月31日

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  • Yue Li,
  • Stephen P. Good,
  • Lixin Wang

摘要

Stable isotopes are widely used to investigate plant-water interactions, yet many studies report differences in deuterium (δ2H) ratios between plants and source waters (termed δ2H offsets). These δ2H offsets challenge the assumption that water uptake and transport in plants do not alter the isotopic composition of water. Here, we develop a conceptual framework that distinguishes three soil water pools and two plant water pools based on water potential. We synthesize data from 110 published studies across 212 field sites worldwide and reanalyze 6333 δ2H offset measurements using possible source water lines. We find that δ2H offsets are absent when using appropriate water pools (e.g., use sap flow water rather than bulk xylem tissue water to represent plant water), with mean offsets not statistically different from zero. We argue that accurately separating correct water pools from bulk water pools in soils and plants is key to reconciling the observed δ2H offsets.