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- Title
Soil Greenhouse Gas Fluxes during Wetland Forest Retreat along the Lower Savannah River, Georgia (USA).
- Authors
Krauss, Ken; Whitbeck, Julie
- Abstract
Tidal freshwater forested wetlands (tidal swamps) are periodically affected by salinity intrusion at seaward transitions with marsh, which, along with altered hydrology, may affect the balance of gaseous carbon (C) and nitrogen (N) losses from soils. We measured greenhouse gas emissions (CO, CH, NO) from healthy, moderately degraded, and degraded tidal swamp soils undergoing sea-level-rise-induced retreat along the lower Savannah River, Georgia, USA. Soil CO flux ranged from 90.2 to 179.1 mg CO m h among study sites, and was the dominant greenhouse gas emitted. CO flux differed among sites in some months, while CH and NO fluxes were 0.18 mg CH m h and 1.23 μg NO m h, respectively, with no differences among sites. Hydrology, soil temperature, and air temperature, but not salinity, controlled the annual balance of soil CO emissions from tidal swamp soils. No clear drivers were found for CH or NO emissions. On occasion, large ebbing or very low tides were even found to draw CO fluxes into the soil (dark CO uptake), along with CH and NO. Overall, we hypothesized a much greater role for salinity and site condition in controlling the suite of greenhouse gases emitted from tidal swamps than we discovered, and found that CO emissions-not CH or NO-contributed most to the global warming potential from these tidal swamp soils.
- Subjects
WETLANDS; CARBON dioxide; HYDROLOGY; GREENHOUSE gases; SWAMPS; GLOBAL warming
- Publication
Wetlands, 2012, Vol 32, Issue 1, p73
- ISSN
0277-5212
- Publication type
Article
- DOI
10.1007/s13157-011-0246-8