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-dominated 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 g C m−2 yr−1 in Sphagnum mesocosms, this reached 1018±362 and 33±8 g C m−2 yr−1 in mesocosms with
Sphagnum 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, leading
to an annual CO2 and CH4 budget of −30 g C m−2 yr−1 in
Sphagnum 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 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 litter of Molinia caerulea could provide substrates for C emissions that
were not taken into account in the short measurement period studied here.
Supplementary material to "CO<sub>2</sub> and CH<sub>4</sub> budgets and global warming potential modifications in <i>Sphagnum</i>-dominated peat mesocosms invaded by <i>Molinia caerulea</i>"