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. Plant communities play a key role in regulatinggreenhouse gas (GHG) emissions in peatland ecosystems and therefore in theirability to act as carbon (C) sinks. However, in response to global change, ashift from Sphagnum-dominated to vascular-plant-dominated peatlands may occur, with apotential alteration in their C-sink function. To investigate how the mainGHG 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 mesocosmexperiment was set up. Gross primary production (GPP), ecosystem respiration(ER) and CH4 emission models were used to estimate the annual C balanceand global warming potential under both vegetation covers. While the ER andCH4 emission models estimated an output of, respectively, 376±108 and 7±4 g C m−2 yr−1 in Sphagnum mesocosms, this reached 1018±362 and 33±8 g C m−2 yr−1 in mesocosms withSphagnum rubellum and Molinia caerulea. Annual modeled GPP was estimated at -414±122 and -1273±482 g C m−2 yr−1 in Sphagnum and Sphagnum + Molinia plots, respectively, leadingto an annual CO2 and CH4 budget of −30 g C m−2 yr−1 inSphagnum plots and of −223 g C m−2 yr−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 plantcommunities have a climate warming effect. The shift of vegetation fromSphagnum mosses to Molinia caerulea seems beneficial for C sequestration at a gaseous level.However, roots and litter of Molinia caerulea could provide substrates for C emissions thatwere not taken into account in the short measurement period studied here.

biogeosciences

CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; budgets and global warming potential modifications in &amp;lt;i&amp;gt;Sphagnum&amp;lt;/i&amp;gt;-dominated peat mesocosms invaded by &amp;lt;i&amp;gt;Molinia caerulea&amp;lt;/i&amp;gt;