Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2

Abstract The clumped isotope composition (Δ47, the anomaly of the mass 47 isotopologue relative to the abundance expected from a random isotope distribution) of CO2 has been suggested as an additional tracer for gross CO2 fluxes. However, the effect of photosynthetic gas exchange on Δ47 has not been...

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Autores principales:	Getachew Agmuas Adnew, Magdalena E. G. Hofmann, Thijs L. Pons, Gerbrand Koren, Martin Ziegler, Lucas J. Lourens, Thomas Röckmann
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/03efb53051f5495dbba61126132fb58d
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spelling	oai:doaj.org-article:03efb53051f5495dbba61126132fb58d2021-12-02T15:39:50ZLeaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 210.1038/s41598-021-93092-02045-2322https://doaj.org/article/03efb53051f5495dbba61126132fb58d2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93092-0https://doaj.org/toc/2045-2322Abstract The clumped isotope composition (Δ47, the anomaly of the mass 47 isotopologue relative to the abundance expected from a random isotope distribution) of CO2 has been suggested as an additional tracer for gross CO2 fluxes. However, the effect of photosynthetic gas exchange on Δ47 has not been directly determined and two indirect/conceptual studies reported contradicting results. In this study, we quantify the effect of photosynthetic gas exchange on Δ47 of CO2 using leaf cuvette experiments with one C4 and two C3 plants. The experimental results are supported by calculations with a leaf cuvette model. Our results demonstrate the important roles of the Δ47 value of CO2 entering the leaf, kinetic fractionation as CO2 diffuses into, and out of the leaf and CO2–H2O isotope exchange with leaf water. We experimentally confirm the previously suggested dependence of Δ47 of CO2 in the air surrounding a leaf on the stomatal conductance and back-diffusion flux. Gas exchange can enrich or deplete the Δ47 of CO2 depending on the Δ47 of CO2 entering the leaf and the fraction of CO2 exchanged with leaf water and diffused back to the atmosphere, but under typical ambient conditions, it will lead to a decrease in Δ47.Getachew Agmuas AdnewMagdalena E. G. HofmannThijs L. PonsGerbrand KorenMartin ZieglerLucas J. LourensThomas RöckmannNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Getachew Agmuas Adnew Magdalena E. G. Hofmann Thijs L. Pons Gerbrand Koren Martin Ziegler Lucas J. Lourens Thomas Röckmann Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2
description	Abstract The clumped isotope composition (Δ47, the anomaly of the mass 47 isotopologue relative to the abundance expected from a random isotope distribution) of CO2 has been suggested as an additional tracer for gross CO2 fluxes. However, the effect of photosynthetic gas exchange on Δ47 has not been directly determined and two indirect/conceptual studies reported contradicting results. In this study, we quantify the effect of photosynthetic gas exchange on Δ47 of CO2 using leaf cuvette experiments with one C4 and two C3 plants. The experimental results are supported by calculations with a leaf cuvette model. Our results demonstrate the important roles of the Δ47 value of CO2 entering the leaf, kinetic fractionation as CO2 diffuses into, and out of the leaf and CO2–H2O isotope exchange with leaf water. We experimentally confirm the previously suggested dependence of Δ47 of CO2 in the air surrounding a leaf on the stomatal conductance and back-diffusion flux. Gas exchange can enrich or deplete the Δ47 of CO2 depending on the Δ47 of CO2 entering the leaf and the fraction of CO2 exchanged with leaf water and diffused back to the atmosphere, but under typical ambient conditions, it will lead to a decrease in Δ47.
format	article
author	Getachew Agmuas Adnew Magdalena E. G. Hofmann Thijs L. Pons Gerbrand Koren Martin Ziegler Lucas J. Lourens Thomas Röckmann
author_facet	Getachew Agmuas Adnew Magdalena E. G. Hofmann Thijs L. Pons Gerbrand Koren Martin Ziegler Lucas J. Lourens Thomas Röckmann
author_sort	Getachew Agmuas Adnew
title	Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2
title_short	Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2
title_full	Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2
title_fullStr	Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2
title_full_unstemmed	Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2
title_sort	leaf scale quantification of the effect of photosynthetic gas exchange on δ47 of co 2
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/03efb53051f5495dbba61126132fb58d
work_keys_str_mv	AT getachewagmuasadnew leafscalequantificationoftheeffectofphotosyntheticgasexchangeond47ofco2 AT magdalenaeghofmann leafscalequantificationoftheeffectofphotosyntheticgasexchangeond47ofco2 AT thijslpons leafscalequantificationoftheeffectofphotosyntheticgasexchangeond47ofco2 AT gerbrandkoren leafscalequantificationoftheeffectofphotosyntheticgasexchangeond47ofco2 AT martinziegler leafscalequantificationoftheeffectofphotosyntheticgasexchangeond47ofco2 AT lucasjlourens leafscalequantificationoftheeffectofphotosyntheticgasexchangeond47ofco2 AT thomasrockmann leafscalequantificationoftheeffectofphotosyntheticgasexchangeond47ofco2
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Leaf scale quantification of the effect of photosynthetic gas exchange on Δ47 of CO 2

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