HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

The impact of soil microorganisms on the global budget of δ18O in atmospheric CO2

Lisa Wingate 1, 2 Jérôme Ogée 1 Matthias Cuntz 3 Bernard Genty 4 Ilja Reiter Ulli Seibt 5, 6 Dan Yakir 7 Kadmiel Maseyk 5, 6, 7 Elise G. Pendall 8 Margatet M. Barbour 9 Behzad Mortazavi 10, 11 Régis Burlett 1 Philippe Peylin 5, 12, 13 John Miller 14, 15 Maurizio Mencuccini 2 Jee H. Shim 16 John Hunt 9 John Grace 2
1 EPHYSE - Écologie fonctionnelle et physique de l'environnement
2 School of GeoSciences
3 MPI-BGC - Max Planck Institute for Biogeochemistry
4 BCMPB - Biologie cellulaire et moléculaire des plantes et des bactéries
5 Bioemco - Biogéochimie et écologie des milieux continentaux
6 UPMC - Université Pierre et Marie Curie - Paris 6
7 Weizmann Institute of Science [Rehovot, Israël]
8 Department of Botany
9 Manaaki Whenua – Landcare Research [Lincoln]
10 Department of Biological Sciences
11 Dauphin Island Sea Lab
12 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
13 MOSAIC - Modélisation des Surfaces et Interfaces Continentales
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
14 NOAA - National Oceanic and Atmospheric Administration
15 CIRES - Cooperative Institute for Research in Environmental Sciences
16 CSU - Colorado State University [Fort Collins]
Abstract : Improved global estimates of terrestrial photosynthesis and respiration are critical for predicting the rate of change in atmospheric CO2. The oxygen isotopic composition of atmospheric CO2 can be used to estimate these fluxes because oxygen isotopic exchange between CO2 and water creates distinct isotopic flux signatures. The enzyme carbonic anhydrase (CA) is known to accelerate this exchange in leaves, but the possibility of CA activity in soils is commonly neglected. Here, we report widespread accelerated soil CO2 hydration. Exchange was 10–300 times faster than the uncatalyzed rate, consistent with typical population sizes for CA-containing soil microorganisms. Including accelerated soil hydration in global model simulations modifies contributions from soil and foliage to the global CO18O budget and eliminates persistent discrepancies existing between model and atmospheric observations. This enhanced soil hydration also increases the differences between the isotopic signatures of photosynthesis and respiration, particularly in the tropics, increasing the precision of CO2 gross fluxes obtained by using the δ18O of atmospheric CO2 by 50%.
Keywords : carbon cycle terrestrial biosphere oxygen isotopes carbonic anhydrase water cycle
Document type :
Journal articles
Complete list of metadata

Cited literature [35 references]  Display  Hide  Download
https://hal.inrae.fr/hal-02667878
Contributor : Migration Prodinra Connect in order to contact the contributor
Submitted on : Sunday, May 31, 2020 - 11:37:08 AM
Last modification on : Thursday, March 17, 2022 - 10:08:38 AM

File

Vignette du document
2009_Wingate_Proceedings of th...
Publisher files allowed on an open archive

Identifiers

Collections

INRAE | INRA | CEA | UPMC | AGROPARISTECH | UNIV-AMU | CNRS | SORBONNE-UNIVERSITE | PSL | SU-TI | LSCE | INSU | LSCE-CEA | UVSQ | GS-GEOSCIENCES

Citation

Lisa Wingate, Jérôme Ogée, Matthias Cuntz, Bernard Genty, Ilja Reiter, et al.. The impact of soil microorganisms on the global budget of δ18O in atmospheric CO2. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2009, 106 (52), pp.22411-22415. ⟨10.1073/pnas.0905210106⟩. ⟨hal-02667878⟩

Export

BibTeX TEI DC DCterms EndNote Datacite

Share

Metrics

Record views

229

Files downloads

19