HR: 0800h
AN: B21C-0901    [Abstracts]
TI: Carbon Storage in Wetland Soils and Export to Streams in Southeastern Alaska
AU: * D Amore, D
EM: ddamore@fs.fed.us
AF: USDA Forest Service, Pacific Northwest Research Station, 2770 Sherwood Lane, Suite 2A, Juneau, AK 99801 United States
AU: Fellman, J
EM: jfellman@fs.fed.us
AF: USDA Forest Service, Pacific Northwest Research Station, 2770 Sherwood Lane, Suite 2A, Juneau, AK 99801 United States
AU: Edwards, R
EM: rtedwards@fs.fed.us
AF: USDA Forest Service, Pacific Northwest Research Station, 2770 Sherwood Lane, Suite 2A, Juneau, AK 99801 United States
AU: Hood, E
EM: jfewh@uas.alaska.edu
AF: Environmental Science Program, University of Alaska Southeast, 11120 Glacier Hwy, Juneau, AK 99801 United States
AU: Lange, B
EM: blange@fs.fed.us
AF: Environmental Science Program, University of Alaska Southeast, 11120 Glacier Hwy, Juneau, AK 99801 United States
AB: The majority of terrestrial carbon in southeast Alaska is stored in extensive wetlands dominated by peat. This carbon stock is believed to contribute much dissolved organic carbon (DOC) to streams, though few studies have documented the magnitude of this supply throughout the diverse watersheds in southeast Alaska. Wetland soils in southeast Alaska vary widely in organic matter depth and decomposition that influence both carbon and nutrient cycles within these different soils. We characterized soil type, storage, and export of carbon in a bog (peatland) and a forested wetland to establish reference levels of nutrient export from these wetland types. The bog had a deeper peat accumulation compared to the forested wetland, although DOC concentrations were higher in lysimeters in the forested wetland (70 to 90 mg C/L) than the peatland (20 to 49 mg C/L). DOC concentration in wells (15 to 45 mg C/L) and export from tributaries (5 to 41 mg C/L) draining both the forested wetland and peatland was similar with peak DOC concentrations and export linked to high soil temperatures and storm flushing in mid-summer. This relationship would support a positive feedback of increased DOC export with warmer temperatures and higher rainfall in the hypermaritime ecosystem of coastal North America.
DE: 1719 Hydrology
DE: 1615 Biogeochemical processes (4805)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting