Preprints
https://doi.org/10.5194/hess-2021-289
https://doi.org/10.5194/hess-2021-289
06 Jul 2021
 | 06 Jul 2021
Status: this preprint was under review for the journal HESS but the revision was not accepted.

Controls of seasonality and altitude on generation of leaf water isotopes

Jinzhao Liu, Huawu Wu, Haiwei Zhang, Guoqiang Peng, Chong Jiang, Ying Zhao, and Jing Hu

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: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-289', Anonymous Referee #1, 27 Jul 2021
    • AC1: 'Reply on RC1', Jinzhao Liu, 17 Sep 2021
  • RC2: 'Comment on hess-2021-289', Anonymous Referee #2, 09 Sep 2021
    • AC2: 'Reply on RC2', Jinzhao Liu, 17 Sep 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-289', Anonymous Referee #1, 27 Jul 2021
    • AC1: 'Reply on RC1', Jinzhao Liu, 17 Sep 2021
  • RC2: 'Comment on hess-2021-289', Anonymous Referee #2, 09 Sep 2021
    • AC2: 'Reply on RC2', Jinzhao Liu, 17 Sep 2021

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.