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Cultivation of bioenergy crops in rewetted peatland (paludiculture) isconsidered as a possible land use option to mitigate greenhouse gas (GHG)emissions. However, bioenergy crops like reed canary grass (RCG) can have acomplex influence on GHG fluxes. Here we determined the effect of RCGcultivation on GHG emission from peatland rewetted to various extents.Mesocosms were manipulated to three different ground water levels (GWLs),i.e. 0, −10 and −20 cm below the soil surface in a controlledsemi-field facility. Emissions of CO2 (ecosystem respiration, ER),CH4 and N2O from mesocosms with RCG and bare soil were measured atweekly to fortnightly intervals with static chamber techniques for a periodof 1 year. Cultivation of RCG increased both ER and CH4 emissions, butdecreased the N2O emissions. The presence of RCG gave rise to 69, 75 and85% of total ER at −20, −10 and 0 cm GWL, respectively. However,this difference was due to decreased soil respiration at the rising GWL asthe plant-derived CO2 flux was similar at all three GWLs. For methane,70–95% of the total emission was due to presence of RCG, with thehighest contribution at −20 cm GWL. In contrast, cultivation of RCGdecreased N2O emission by 33–86% with the major reductions at−10 and −20 cm GWL. In terms of global warming potential, the increasein CH4 emissions due to RCG cultivation was more than offset by thedecrease in N2O emissions at −10 and −20 cm GWL; at 0 cm GWL theCH4 emissions was offset only by 23%. CO2 emissions from ERwere obviously the dominant RCG-derived GHG flux, but above-ground biomassyields, and preliminary measurements of gross photosynthetic production,showed that ER could be more than balanced due to the photosynthetic uptakeof CO2 by RCG. Our results support that RCG cultivation could be a goodland use option in terms of mitigating GHG emission from rewetted peatlands,potentially turning these ecosystems into a sink of atmospheric CO2

Effect of reed canary grass cultivation on greenhouse gas emission from peat soil at controlled rewetting