Robin L. Miller 2011 We measured CO₂ and CH₄ fluxes for 6 years following permanent flooding of an agriculturally managed organic soil at two water depths (~25 and ~55 cm standing water) in the Sacramento&ndash;San Joaquin Delta, California, as part of research studying C dynamics in re-established wetlands. Flooding rapidly reduced gaseous C losses, and radiocarbon data showed that this, in part, was due to reduced oxidation of "old" C preserved in the organic soils. Both CO₂ and CH₄ emissions from the water surface increased during the first few growing seasons, concomitant with emergent marsh establishment, and thereafter appeared to stabilize according to plant communities. Areas of emergent marsh vegetation in the shallower wetland had greater net CO₂ influx (-485 mg Cm^-1 h^-1), and lower CH₄ emissions (11.5 mg Cm^-2 h<sup>-1<sup>), than in the deeper wetland (-381 and 14.1 mg Cm^-2 h<sup>-1<sup>, respectively). Areas with submerged and floating vegetation in the deeper wetland had CH₄ emissions similar to emergent vegetation (11.9 and 12.6 mg Cm^-2 h<sup>-1<sup>, respectively), despite lower net CO₂ influx (-102 gC m^-2 h<sup>-1<sup>). Measurements of plant moderated net CO₂ influx and CH₄ efflux indicated greatest potential reduction of greenhouse gases in the more shallowly flooded wetland. application/pdf 10.1007/s13157-011-0215-2 en Springer Carbon gas fluxes in re-established wetlands on organic soils differ relative to plant community and hydrology article