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<p>Soil water is a key medium linking the atmosphere, vegetation, and groundwater systems, and its stable isotopes (<sup>2</sup>H and <sup>18</sup>O) are powerful tracers of ecohydrological processes. However, historical soil-water isotope observations remain fragmented, lack structurally harmonized formatting, and are unevenly distributed in space and time, which severely constrains cross-regional and global-scale research. To address these gaps, we compiled and structurally harmonized a comprehensive global dataset of soil-water stable isotopes spanning 1975 to 2024. The dataset integrates primary <i>in-situ</i> measurements, literature-extracted records, and open-repository data, comprising a total of 27,455 records from 463 observation sites across 37 countries on six continents. To facilitate comparative analysis, the records are classified into standardized profile intervals representing shallow (0–10 cm), active-root (10–40 cm), mid-depth (40–100 cm), and deep (&gt;100 cm) soil layers, coupled with essential geospatial and temporal metadata. This globally representative dataset provides a robust empirical foundation for evaluating terrestrial water cycling, calibrating regional hydrological models, tracing ecosystem water-use strategies, and addressing hydroclimatic challenges under global environmental change.</p>

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Global Soil Water Stable Isotope Dataset

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月18日

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  • Jiangwei Yang,
  • Rui Li,
  • Yitian Lei,
  • Kang Ning,
  • Shuping Li,
  • Yurou Zhang,
  • Jingqi Hou,
  • Tao Lang,
  • Yixiao Cao,
  • Wentong Li,
  • Heting Zhang,
  • Yingxiang Wang,
  • Kaina Pan,
  • Zhixian Ren,
  • Rongjin Chen,
  • Xiaoxia Wang,
  • Rui Xia,
  • Guofeng Zhu

摘要

Soil water is a key medium linking the atmosphere, vegetation, and groundwater systems, and its stable isotopes (2H and 18O) are powerful tracers of ecohydrological processes. However, historical soil-water isotope observations remain fragmented, lack structurally harmonized formatting, and are unevenly distributed in space and time, which severely constrains cross-regional and global-scale research. To address these gaps, we compiled and structurally harmonized a comprehensive global dataset of soil-water stable isotopes spanning 1975 to 2024. The dataset integrates primary in-situ measurements, literature-extracted records, and open-repository data, comprising a total of 27,455 records from 463 observation sites across 37 countries on six continents. To facilitate comparative analysis, the records are classified into standardized profile intervals representing shallow (0–10 cm), active-root (10–40 cm), mid-depth (40–100 cm), and deep (>100 cm) soil layers, coupled with essential geospatial and temporal metadata. This globally representative dataset provides a robust empirical foundation for evaluating terrestrial water cycling, calibrating regional hydrological models, tracing ecosystem water-use strategies, and addressing hydroclimatic challenges under global environmental change.