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Peatlands are interesting as a carbon storage option, but are also naturalemitters of the greenhouse gas methane (CH4). Phragmitespeatlands are particularly interesting due to the global abundance of thiswetland plant (Phragmites australis) and the highly efficientinternal gas transport mechanism, which is called humidity-induced convection(HIC). The research aims were to (1) clarify how this plant-mediated gastransport influences the CH4 fluxes, (2) which other environmentalvariables influence the CO2 and CH4 fluxes, and (3) whetherPhragmites peatlands are a net source or sink of greenhouse gases.CO2 and CH4 fluxes were measured with the eddy covariance techniquewithin a Phragmites-dominated fen in southwest Germany. Oneyear of flux data (March 2013–February 2014) shows very clear diurnal andseasonal patterns for both CO2 and CH4. The diurnal pattern ofCH4 fluxes was only visible when living, green reed was present. InAugust the diurnal cycle of CH4 was the most distinct, with 11 timeshigher midday fluxes (15.7 mg CH4 m−2 h−1) than nightfluxes (1.41 mg CH4 m−2 h−1). This diurnal cycle has thehighest correlation with global radiation, which suggests a high influence ofthe plants on the CH4 flux. But if the cause were the HIC, it would beexpected that relative humidity would correlate stronger with CH4 flux. Therefore, we conclude that in additionto HIC, at least one additional mechanism must be involved in the creation ofthe convective flow within the Phragmites plants. Overall, the fenwas a sink for carbon and greenhouse gases in the measured year, with a totalcarbon uptake of 221 g C m−2 yr−1 (26 % of the totalassimilated carbon). The net uptake of greenhouse gases was52 g CO2 eq. m−2 yr−1, which is obtained from an uptake ofCO2 of 894 g CO2 eq. m−2 yr−1 and a release ofCH4 of 842 g CO2 eq. m−2 yr−1

biogeosciences

The role of &amp;lt;i&amp;gt;Phragmites&amp;lt;/i&amp;gt; in the CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; and CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; fluxes in a minerotrophic peatland in southwest Germany