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BG | Articles | Volume 17, issue 14
Biogeosciences, 17, 3903–3922, 2020
https://doi.org/10.5194/bg-17-3903-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Biogeosciences, 17, 3903–3922, 2020
https://doi.org/10.5194/bg-17-3903-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 31 Jul 2020

Research article | 31 Jul 2020

Leaf-scale quantification of the effect of photosynthetic gas exchange on Δ17O of atmospheric CO2

Getachew Agmuas Adnew et al.

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Cited articles

Adnew, G. A., Hofmann, M. E. G., Paul, D., Laskar, A., Surma, J., Albrecht, N., Pack, A., Schwieters, J., Koren, G., Peters, W., and Röckmann, T.: Determination of the triple oxygen and carbon isotopic composition of CO2 from atomic ion fragments formed in the ion source of the 253 Ultra High-Resolution Isotope Ratio Mass Spectrometer, Rapid Commun. Mass. Sp., 33, 17 pp., 2019. 
Badger, M. R. and Price, G. D.: The role of carbonic anhydrase in photosynthesis, Annu. Rev. Plant Biol., 45, 23 pp., 1994. 
Bao, H., Cao, X., and Hayles, J. A.: Triple oxygen isotopes: fundamental relationships and applications, Annu. Rev. Earth Planet. Sci., 44, 29 pp., 2016. 
Barbour, M. M., Evans, J. R., Simonin, K. A., and von Caemmerer, S.: Online CO2 and H2O oxygen isotope fractionation allows estimation of mesophyll conductance in C4 plants, and reveals that mesophyll conductance decreases as leaves age in both C4 and C3 plants, New Phytol., 210, 875–889, https://doi.org/10.1111/nph.13830, 2016. 
Barkan, E. and Luz, B.: High precision measurements of 17O∕16O and 18O∕16O ratios in H2O, Rapid Commun. Mass. Sp., 19, 3737–3742, https://doi.org/10.1002/rcm.2250, 2005. 
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We measured the effect of photosynthesis, the largest flux in the carbon cycle, on the triple oxygen isotope composition of atmospheric CO2 at the leaf level during gas exchange using three plant species. The main factors that limit the impact of land vegetation on the triple oxygen isotope composition of atmospheric CO2 are identified, characterized and discussed. The effect of photosynthesis on the isotopic composition of CO2 is commonly quantified as discrimination (ΔA).
We measured the effect of photosynthesis, the largest flux in the carbon cycle, on the triple...
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