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A Kinetic Analysis of Leaf Uptake of Cos and Its Relation to Transpiration, Photosynthesis and Carbon Isotope Fractionation : Volume 6, Issue 5 (25/09/2009)

By Seibt, U.

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Book Id: WPLBN0004005390
Format Type: PDF Article :
File Size: Pages 22
Reproduction Date: 2015

Title: A Kinetic Analysis of Leaf Uptake of Cos and Its Relation to Transpiration, Photosynthesis and Carbon Isotope Fractionation : Volume 6, Issue 5 (25/09/2009)  
Author: Seibt, U.
Volume: Vol. 6, Issue 5
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Kuhn, U., Sandoval-Soto, L., Berry, J. A., Seibt, U., & Kesselmeier, J. (2009). A Kinetic Analysis of Leaf Uptake of Cos and Its Relation to Transpiration, Photosynthesis and Carbon Isotope Fractionation : Volume 6, Issue 5 (25/09/2009). Retrieved from

Description: Université Pierre et Marie Curie Paris 6, UMR BioEmco, Campus ParisAgroTech, 78850 Thiverval-Grignon, France. Carbonyl sulfide (COS) is an atmospheric trace gas that holds great promise for studies of terrestrial carbon and water exchange. In leaves, COS follows the same pathway as CO2 during photosynthesis. Both gases are taken up in enzyme reactions, making COS and CO2 uptake closely coupled at the leaf scale. The biological background of leaf COS uptake is a hydrolysis reaction catalyzed by the enzyme carbonic anhydrase. Based on this, we derive and test a simple kinetic model of leaf COS uptake, and relate COS to CO2 and water fluxes at the leaf scale. The equation was found to predict realistic COS fluxes compared to observations from field and laboratory chambers. We confirm that COS uptake at the leaf level is directly linked to stomatal conductance. As a consequence, the ratio of deposition velocities (uptake rate divided by ambient mole fraction) for leaf COS and CO2 fluxes can provide an estimate of Ci/Ca the ratio of intercellular to atmospheric CO2, an important plant gas exchange parameter that cannot be measured directly. The majority of published deposition velocity ratios for leaf studies on a variety of species fall in the range of 1.5 to 4, corresponding to Ci/Ca ratios of 0.5 to 0.8. In addition, we utilize the coupling of Ci/Ca and photosynthetic ˆ13C discrimination to derive an estimate of 2.8±0.3 for the global mean ratio of deposition velocities. This corresponds to a global vegetation sink of COS in the order of 900±100 Gg S yr−1. COS can now be implemented in the same model framework as CO2 and water vapour. Atmospheric COS measurements can then provide independent constraints on CO2 and water cycles at ecosystem, regional and global scales.

A kinetic analysis of leaf uptake of COS and its relation to transpiration, photosynthesis and carbon isotope fractionation

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