作者
Anna Gardner, Mingkai Jiang, David S Ellsworth, A Robert MacKenzie, Jeremy Pritchard, Martin Karl‐Friedrich Bader, Craig VM Barton, Carl Bernacchi, Carlo Calfapietra, Kristine Y Crous, Mirindi Eric Dusenge, Teresa E Gimeno, Marianne Hall, Shubhangi Lamba, Sebastian Leuzinger, Johan Uddling, Jeffrey Warren, Göran Wallin, Belinda E Medlyn
发表日期
2023/2
期刊
New Phytologist
卷号
237
期号
4
页码范围
1229-1241
简介
- Optimal stomatal theory predicts that stomata operate to maximise photosynthesis (Anet) and minimise transpirational water loss to achieve optimal intrinsic water‐use efficiency (iWUE). We tested whether this theory can predict stomatal responses to elevated atmospheric CO2 (eCO2), and whether it can capture differences in responsiveness among woody plant functional types (PFTs).
- We conducted a meta‐analysis of tree studies of the effect of eCO2 on iWUE and its components Anet and stomatal conductance (gs). We compared three PFTs, using the unified stomatal optimisation (USO) model to account for confounding effects of leaf–air vapour pressure difference (D). We expected smaller gs, but greater Anet, responses to eCO2 in gymnosperms compared with angiosperm PFTs.
- We found that iWUE increased in proportion to increasing eCO2 in all PFTs, and that increases in Anet had stronger effects than …
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