Journal
WETLANDS
Volume 31, Issue 6, Pages 1055-1066Publisher
SPRINGER
DOI: 10.1007/s13157-011-0215-2
Keywords
Carbon dioxide; Freshwater wetlands; Greenhouse gases; Methane; Peat; Subsidence
Categories
Funding
- California Department of Water Resources
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We measured CO2 and CH4 fluxes for 6 years following permanent flooding of an agriculturally managed organic soil at two water depths (similar to 25 and similar to 55 cm standing water) in the Sacramento-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 C m(-1) h(-1)), and lower CH4 emissions (11.5 mg C m(-2) h(-1)), than in the deeper wetland (-381 and 14.1 mg C m(-2) h(-1), respectively). Areas with submerged and floating vegetation in the deeper wetland had CH4 emissions similar to emergent vegetation (11.9 and 12.6 mg C m(-2) h(-1), respectively), despite lower net CO2 influx (-102 g C m(-2) h(-1)). Measurements of plant moderated net CO2 influx and CH4 efflux indicated greatest potential reduction of greenhouse gases in the more shallowly flooded wetland.
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