Carbon balance of a European mountain bog at contrasting stages of regeneration

Authors

  • Estelle Bortoluzzi,

    1. Université de Franche-Comté, UMR 6565 CNRS, Laboratoire de Chrono-Ecologie, La Bouloie, F−25030 Besançon, France;
    2. Université de Franche-Comté, EA 3184 Laboratoire de Biologie et Ecophysiologie, Place Leclerc, F−25030 Besançon, France;
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  • Daniel Epron,

    1. Université Henri Poincaré Nancy 1, UMR INRA UHP1137 Ecologie et Ecophysiologie Forestière, I.F.R. 110, F−54506 Vandoeuvre cedex, France;
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  • Andy Siegenthaler,

    1. Ecole Polytechnique Fédérale de Lausanne-EPFL, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Ecublens, box 96, CH−1015 Lausanne, Switzerland
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  • Daniel Gilbert,

    1. Université de Franche-Comté, EA 3184 Laboratoire de Biologie et Ecophysiologie, Place Leclerc, F−25030 Besançon, France;
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  • Alexandre Buttler

    1. Université de Franche-Comté, UMR 6565 CNRS, Laboratoire de Chrono-Ecologie, La Bouloie, F−25030 Besançon, France;
    2. Ecole Polytechnique Fédérale de Lausanne-EPFL, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Ecublens, box 96, CH−1015 Lausanne, Switzerland
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Author for correspondence: Daniel Epron Tel: +33 383684249 Fax: +33 383684240 Email: daniel.epron@scbiol.uhp-nancy.fr

Summary

  • • Carbon dioxide and methane (CH4) fluxes were measured in a cutover bog of the Jura Mountains (France) together with biotic and abiotic variables for two entire vegetation periods in order to compare the carbon balance of the bog at three stages of regeneration.
  • • Among all factors, air temperature and vegetation index (including leaf area of vascular plants, bryophyte density and bryophyte desiccation) were the two main determinants of ecosystem respiration and gross photosynthesis at light saturation.
  • • During 2004 and 2005, the vegetated plots acted as carbon sinks. Net carbon exchange ranged between 67 and 166 g C m−2 yr−1 for the Eriophorum-dominated plots and between 93 and 183 g C m−2 yr−1 for the Sphagnum-dominated plots. The bare peat plots represented a net carbon source (between −19 and −32 g C m−2 yr−1). Methane fluxes accounted for a very small part of the total carbon efflux (< 2%).
  • • The recovery of vegetation in our naturally regenerating bog was beneficial for the carbon sequestration after the relatively short period of 20 yr.

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