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.
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Abbreviations
- E T :
-
Trunk CO2 efflux
- E S :
-
Soil CO2 efflux
- E ECO :
-
Ecosystem CO2 efflux
- δ13C:
-
Carbon isotope composition
- δ13CE :
-
Carbon isotope composition of CO2 efflux
- δ13CEECO :
-
δ13CE of ecosystem
- δ13CEL :
-
δ13CE of leaves
- δ13CETG :
-
δ13CE of twigs
- δ13CET :
-
δ13CE of trunk
- δ13CES :
-
δ13CE of soil
- δ13COM :
-
δ13C of total organic matter
- δ13COM :
-
δ13COM of leaf
- δ13COMT :
-
δ13COM of twig
- δ13COMT :
-
δ13COM of trunk
- δ13COMS :
-
δ13C of soil total organic matter
- Doy:
-
Day of year
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Acknowledgements
The authors are grateful to the Office National des Forêts, especially M. Bénard, for facilitating experimental work at Barbeau. We acknowledge N. Bréda (INRA Nancy, France) for trunk growth measurements at Hesse. The platform Métabolisme-Métabolome of the IFR87 is acknowledged for the isotope measurements. We are grateful to M. Danger and X. Raynaud for valuable discussions on the manuscript and to E. M. Gross for revising the manuscript. We thank two anonymous reviewers and the editor for their helpful comments and improvements to the manuscript.
Funding
This research was funded by the French projects ‘Ministère délégué à la recherche-ACI Jeunes Chercheurs’ (no. JC10009) and ‘Programme National ACI/FNS ECCO, PNBC’ (convention no. 0429 FNS) and by the ESE laboratory thanks to funds from Paris-Sud University and CNRS.
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Handling Editor: Erwin Dreyer
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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: performing practical work, field sampling, phenological and climatic measurements and isotopic analysis from Barbeau and Hesse sites.
Florence Maunoury-Danger Nicolas Chemidlin Prevost Boure, Jérôme Ngao, Bernard Longdoz, Daniel Epron, Claire Damesin: data analyses
Claire Damesin: designing the experiment and coordinating the research projects ‘Ministère délégué à la recherche-ACI Jeunes Chercheurs’ (no. JC10009) and ‘Programme National ACI/FNS ECCO PNBC’ (convention no. 0429 FNS)
Florence Maunoury-Danger: writing the paper
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Maunoury-Danger, F., Chemidlin Prevost Boure, N., Ngao, J. et al. Carbon isotopic signature of CO2 emitted by plant compartments and soil in two temperate deciduous forests. Annals of Forest Science 70, 173–183 (2013). https://doi.org/10.1007/s13595-012-0249-5
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DOI: https://doi.org/10.1007/s13595-012-0249-5