Determination of respiration and photosynthesis fractionation factors for atmospheric dioxygen inferred from a vegetation–soil–atmosphere analogue of the terrestrial biosphere in closed chambers
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Published:2023-03-16
Issue:5
Volume:20
Page:1047-1062
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Paul Clémence, Piel ClémentORCID, Sauze Joana, Pasquier Nicolas, Prié Frédéric, Devidal Sébastien, Jacob Roxanne, Dapoigny Arnaud, Jossoud OlivierORCID, Milcu Alexandru, Landais Amaëlle
Abstract
Abstract. The isotopic composition of dioxygen in the atmosphere is a global tracer
which depends on the biosphere flux of dioxygen toward and from the
atmosphere (photosynthesis and respiration) as well as exchanges with the
stratosphere. When measured in fossil air trapped in ice cores, the relative
concentration of 16O, 17O, and 18O of O2 can be used for
several applications such as ice core dating and past global productivity
reconstruction. However, there are still uncertainties about the accuracy of
these tracers as they depend on the integrated isotopic discrimination of
different biological processes of dioxygen production and uptake, for which
we currently have very few independent estimates. Here we determined the
respiration and photosynthesis fractionation factors for atmospheric
dioxygen from experiments carried out in a replicated
vegetation–soil–atmosphere analogue of the terrestrial biosphere in closed
chambers with growing Festuca arundinacea. The values for 18O discrimination during soil
respiration and dark respiration in leaves are equal to -12.3±1.7 ‰ and -19.1±2.4 ‰,
respectively. In these closed biological chambers, we also found a value
attributed to terrestrial photosynthetic isotopic discrimination equal to
+3.7±1.3 ‰. This last estimate suggests that
the contribution of terrestrial productivity in the Dole effect may have
been underestimated in previous studies.
Funder
H2020 European Research Council
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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