Peatlands : carbon sinks

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  • Comparison of carbon fluxes between different stages of regeneration in a harvested bog (Jura, France)

    E. Bortoluzzi1, D. Epron2, D. Gilbert1, A. Buttler1,2

    1 University of Franche-Comt (France) 2University Henri Poincar, Nancy (France) 3 Swiss Federal Institute of Technology-EPFL, Swiss Federal Institute WSL, Lausanne (Switzerland)

  • Peatlands : carbon sinksA considerable stake in the actual context, as illustrated by these extracts of the Kyoto Protocol (1992)Article 7 1. Each Party (...) shall incorporate in its annual inventory of anthropogenic emissions by sources and removals by sinks of greenhouse gases (...)

    (ii) Parties (...) contribute to addressing climate change and its adverse impacts, including the abatement of increases in greenhouse gas emissions, and enhancement of and removals by sinks (...)Article 10b

  • Peatlands, carbon sinks ?RtotalCO2CH4CO2CO2RtotalAt which time in the regeneration process does the peatland again become a carbon sink?This is one of the problematic of the european project RECIPE (Reconciling commercial exploitation of peat with biodiversity in peatland ecosystems)CO2

  • Objectives :Establishment of a carbon balance for different stages of a regeneration process:Bare peatRecent regeneration with much Eriophorum angustifolium and few SphagnumAdvanced regeneration with mainly Sphagnum.

    Comparison of these balances with the vegetation diversity Compartimentation of the fluxes for more precision in the balance

  • In order to establish a carbon balanceSelection of the presented study site : a bog in the french Jura mountains, exploited until 1984

  • In order to establish a carbon balance (2)Setting of the site in a cut-over strip:

  • In order to establish a carbon balance (3)Recording permanently the local climate factors :Light intensityAir temperature, peat temperature (depth of 5 cm and 30 cm)Rain events.

  • In order to establish a carbon balance (4)Fluctuation of ground water tableEstimation of Sphagnum humidity with a visual index:1 : Sphagnum completely dessicated to6 : Sphagnum inundated.Collar, 30 cm of diameter.

  • In order to establish a carbon balance (5)Leaf area index (LAI) for vascular plants :Relation between leaf length (mm) and leaf area (mm2) for Eriophorum angustifoliumY=0,248X1,439R2=0,953calculated with the measurement of the leave length and their density within the collars. For Sphagnum and Polytrichum, measurement of the density only. Surveys in April, July and October.

    Graph3

    957.85

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    rapport longueur/masse sche pour Eriophorum angustifolium

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