2025-12-22 デューク大学(Duke)
A highly magnified view of a single stoma on the leaf of a boat lily (Tradescantia spathacea). The stoma is opening and closing in response to changing levels of carbon dioxide and humidity.
Credit: Douglas Clark
<関連情報>
- https://pratt.duke.edu/news/tree-pores-carbon-dioxide/
- https://www.nature.com/articles/s41558-025-02504-w
水利用効率の向上は樹木の生産性を促進しない Increased efficiency of water use does not stimulate tree productivity
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
Nature Climate Change Published:24 November 2025
DOI:https://doi.org/10.1038/s41558-025-02504-w
Abstract
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.
