SignificanceThe magnitude of the CO fertilization effect on terrestrial photosynthesis is uncertain because it is not directly observed and is subject to confounding effects of climatic variability. We apply three well-established eco-evolutionary optimality theories of gas exchange and photosynthesis, constraining the main processes of CO fertilization using measurable variables. Using this framework, we provide robust observationally inferred evidence that a strong CO fertilization effect is detectable in globally distributed eddy covariance networks. Applying our method to upscale photosynthesis globally, we find that the magnitude of the CO fertilization effect is comparable to its in situ counterpart but highlight the potential for substantial underestimation of this effect in tropical forests for many reflectance-based satellite photosynthesis products.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8915860 | PMC |
| http://dx.doi.org/10.1073/pnas.2115627119 | DOI Listing |
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