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Carbon isotopic signature of CO2 emitted by plant compartments and soil in two temperate deciduous forests
Authors:Florence Maunoury-Danger  Nicolas Chemidlin Prevost Boure  Jérôme Ngao  Daniel Berveiller  Claude Brechet  Eric Dufrene  Daniel Epron  Jean-Christophe Lata  Bernard Longdoz  Caroline Lelarge-Trouverie  Jean-Yves Pontailler  Kamel Soudani  Claire Damesin
Institution:1. AgroPariTech, Ecologie Systématique et Evolution, UMR 8079, CNRS, Univ. Paris-Sud, Orsay, 91405, France
7. Université de Lorraine, LIEBE, CNRS, UMR 7146, Metz, 57070, France
3. INRA, écologie et écophysiologie Forestières, UMR 1137, Champenoux, 54280, France
8. INRA, Clermont Université Blaise Pascal, UMR 547 PIAF, 63100, Clermont-Ferrand, France
2. CNRS, UMR 8079, Ecologie Systématique et Evolution, Orsay, 91405, France
4. écologie et écophysiologie Forestières, UMR 1137, Université de Lorraine, Vandoeuvre, 54506, France
5. UMR 7618, Ecole Normale Supérieure, UPMC-Bioemco, 46 Rue d’Ulm, 75230, Paris Cedex 05, France
6. UMR 8618, Institut de Biotechnologie des Plantes, Univ. Paris-Sud, Orsay, 91405, France
Abstract:

? Context

The carbon isotope composition of the CO2 efflux (δ13CE) from ecosystem components is widely used to investigate carbon cycles and budgets at different ecosystem scales. δ13CE, was considered constant but is now known to vary along seasons. The seasonal variations have rarely been compared among different ecosystem components.

? Aims

We aimed to characterise simultaneously the seasonal dynamics of δ13CE in different compartments of two temperate broadleaved forest ecosystems.

? Methods

Using manual chambers and isotope ratio mass spectrometry, we recorded simultaneously δ13CE and δ13C of organic matter in sun leaves, current-year twigs, trunk bases and soil in an oak and a beech forest during 1 year.

? Results

In the two forests, δ13CE displayed a larger variability in the tree components than in the soil. During the leafy period, a pronounced vertical zonation of δ13CE was observed between the top (sun leaves and twigs with higher values) and bottom (trunk and soil with lower values) of the ecosystem. No correlation was found between δ13CE and δ13C of organic matter. Causes for these seasonal variations and the vertical zonation in isotope signature are discussed.

? Conclusion

Our study shows clear differences in values as well as seasonal dynamics of δ13CE among different components in the two ecosystems. The temporal and local variation of δ13CE cannot be inferred from organic matter signature or CO2 emission rates.
Keywords:
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