Preprints
https://doi.org/10.5194/hess-2021-289
https://doi.org/10.5194/hess-2021-289

  06 Jul 2021

06 Jul 2021

Review status: this preprint is currently under review for the journal HESS.

Controls of seasonality and altitude on generation of leaf water isotopes

Jinzhao Liu1,2, Huawu Wu3, Haiwei Zhang4, Guoqiang Peng5, Chong Jiang1, Ying Zhao6, and Jing Hu1 Jinzhao Liu et al.
  • 1State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
  • 2CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China
  • 3Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
  • 4Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, 710054, China
  • 5School of Geography and Tourism, Shaanxi Normal University, Xi'an 710062, Shaanxi, China
  • 6College of resources and environmental engineering, Ludong University, 264025, Yantai, China

Abstract. Stable oxygen and hydrogen isotopes (δ18O and δ2H) of leaf water which bridges between hydrological processes and plant-derived organic materials that vary spatially and temporally. It is crucially critical to study what controls the δ18O and δ2H values of leaf water for a wide range of applications. Here, we repeatedly sampled soil water, stem water, and leaf water along an elevation transect across seasons on the Chinese Loess Plateau, and analyzed the variations of in the δ18O and δ2H values from precipitation, soil water, stem water, and ultimate leaf water. We found a consistency in the δ18O and δ2H values from in precipitation, soil water, stem water, and leaf water across seasons. , indicating that leaf water can record well the isotopic signals of precipitation well. Importantly, leaf water isotope lines are were generated by the first-order control of source water (soil water and precipitation) associated with seasonality and altitude, and as well as the secondary control of hydroclimate and biochemical factors resulting in weak correlations of the δ18O and δ2H values in leaf water. This study is helpful to better understandimproves our understanding of the generation of leaf water isotopes.

Jinzhao Liu et al.

Status: open (until 03 Sep 2021)

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  • RC1: 'Comment on hess-2021-289', Anonymous Referee #1, 27 Jul 2021 reply

Jinzhao Liu et al.

Jinzhao Liu et al.

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Short summary
Why do leaf water isotopes can generate to be an isotopic line in a dual-isotope plot? This isotopic water line is as important as the local meteoric water line (LMWL) in the isotope ecohydrology field. We analyzed the variations of oxygen and hydrogen isotopes in soil water, stem water, and leaf water along an elevation transect across seasons. We found that both seasonality and altitude affecting source water are likely to result in the generation of an isotopic water line in leaf water.