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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2019-82
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-82
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 12 Mar 2019

Submitted as: research article | 12 Mar 2019

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Biogeosciences (BG) and is expected to appear here in due course.

CO2 and CH4 budgets and global warming potential modifications in Sphagnum-dominated peat mesocosms invaded by Molinia caerulea

Fabien Leroy1,2,3, Sébastien Gogo1,2,3, Christophe Guimbaud4,5, Léonard Bernard-Jannin1,2,3, Xiaole Yin6, Guillaume Belot4,5, Wang Shuguang6, and Fatima Laggoun-Défarge1,2,3 Fabien Leroy et al.
  • 1Université d’Orléans, ISTO, UMR 7327, 45071, Orléans, France
  • 2CNRS, ISTO, UMR 7327, 45071 Orléans, France
  • 3BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France
  • 4Université d’Orléans, LPC2E, UMR 7328, 45071, Orléans, France
  • 5CNRS, LPC2E, UMR 7328, 45071, Orléans, France
  • 6School of Environmental Science and Engineering, Shandong University, Jinan, China

Abstract. Plant communities play a key role in regulating greenhouse gas (GHG) emissions in peatland ecosystems and therefore in their ability to act as carbon (C) sinks. However, in response to global change, a shift from Sphagnum to vascular plant-dominated peatlands may occur, with a potential alteration in their C-sink function. To investigate how the main GHG fluxes (CO2 and CH4) are affected by a plant community change (shift from dominance of Sphagnum mosses to vascular plants, i.e. Molinia caerulea), a mesocosm experiment was set up. Gross primary production (GPP), ecosystem respiration (ER) and CH4 emission models were used to estimate the annual C balance and global warming potential under both vegetation covers. While the ER and CH4 emission models estimated an output of, respectively, 376 ± 108 and 7 ± 4 gC m−2 y−1 in Sphagnum mesocosms, this reached 1018 ± 362 and 33 ± 8 gC m−2 y−1 in mesocosms with Sphagnum rubellum and Molinia caerulea. Annual modelled GPP was estimated at −414 ± 122 and −1273 ± 482 gC m−2 y−1 in Sphagnum and Sphagnum + Molinia plots, respectively, leading to an annual CO2 and CH4 budget of −30 gC m−2 y−1 in Sphagnum plots and of −223 gC m−2 y−1 in Sphagnum + Molinia ones (i.e., a C-sink). Even if, CH4 emissions accounted for a small part of the gaseous C efflux (ca. 3 %), their global warming potential value makes both plant communities have a climate warming effect. The shift of vegetation from Sphagnum mosses to Molinia caerulea seems beneficial for C sequestration at a gaseous level. However, roots and litters of Molinia caerulea could provide substrates for C emissions that were not taken into account in the short measurement period studied here.

Fabien Leroy et al.
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Interactive discussion
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Status: closed
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Fabien Leroy et al.
Fabien Leroy et al.
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