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<p>Rising concentrations of atmospheric CO<sub>2</sub> (<i>c</i><sub>a</sub>) increase plant photosynthesis (<i>A</i><sub>n</sub>) and reduce stomatal conductance (<i>g</i><sub>s</sub>). This increases the intrinsic water-use efficiency (iWUE = <i>A</i><sub>n </sub>/ <i>g</i><sub>s</sub>), a major proxy of tree adaptation to climate change. However, whether an increase in iWUE leads to a concomitant increase in tree growth remains in dispute, prompting interest in theoretical links between iWUE and tree productivity. Here using an optimality theory for kinetics of stomatal aperture, we establish an envelope delineating maximal relative increases in tree productivity that can be inferred/expected from relative increases in iWUE. The resulting expressions are used to interpret relations between iWUE (an observable proxy) and tree growth (the target variable), using available experimental data from manipulation experiments and tree-ring isotopes. While rising <i>c</i><sub>a</sub> increases iWUE, proportional increases in tree growth are unlikely given ameliorating environmental (for example, rising atmospheric dryness) and anatomical/physiological (for example, tree height) influences.</p>

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Increased efficiency of water use does not stimulate tree productivity

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Quan Zhang,
  • Jiawei Zhang,
  • Mark A. Adams,
  • Giovanna Battipaglia,
  • Lucas A. Cernusak,
  • Laura Fernández-de-Uña,
  • Darren L. Ficklin,
  • Peter Hietz,
  • J. Julio Camarero,
  • Högne Jungner,
  • Mathieu Lévesque,
  • Stefano Manzoni,
  • Justin T. Maxwell,
  • Charles A. Nock,
  • Josep Peñuelas,
  • Klaus J. Puettmann,
  • Matthias Saurer,
  • Rocio Urrutia-Jalabert,
  • Peter van der Sleen,
  • Lixin Wang,
  • Danielle A. Way,
  • Yang Zhou,
  • Pieter A. Zuidema,
  • Gabriel G. Katul

摘要

Rising concentrations of atmospheric CO2 (ca) increase plant photosynthesis (An) and reduce stomatal conductance (gs). This increases the intrinsic water-use efficiency (iWUE = An / gs), a major proxy of tree adaptation to climate change. However, whether an increase in iWUE leads to a concomitant increase in tree growth remains in dispute, prompting interest in theoretical links between iWUE and tree productivity. Here using an optimality theory for kinetics of stomatal aperture, we establish an envelope delineating maximal relative increases in tree productivity that can be inferred/expected from relative increases in iWUE. The resulting expressions are used to interpret relations between iWUE (an observable proxy) and tree growth (the target variable), using available experimental data from manipulation experiments and tree-ring isotopes. While rising ca increases iWUE, proportional increases in tree growth are unlikely given ameliorating environmental (for example, rising atmospheric dryness) and anatomical/physiological (for example, tree height) influences.