HR: 0800h
AN: B41B-0105    [Abstracts]
TI: Dependence of Soil Temperature on the Fluxes of CO$_{2}$, CH$_{4}$, and N$_{2}$O in Boreal Forest Soils, Interior Alaska
AU: Kim, Y
EM: kimyw@iarc.uaf.edu
AF: International Arctic Research Center/ University of Alaska Fairbanks, 930 Koyukuk Dr.,, Fiarbanks, AK 99775-7335 United States
AU: * Tanaka, N
EM: norit@iarc.uaf.edu
AF: International Arctic Research Center/ University of Alaska Fairbanks, 930 Koyukuk Dr.,, Fiarbanks, AK 99775-7335 United States
AB: We measured the fluxes of CO$_{2}$, CH$_{4}$, and N$_{2}$O using static chambers and monitored soil temperatures at three depths (5, 10, and 20 cm) in burned and unburned black spruce forest soils, interior Alaska during the growing seasons of 1999 to 2002. The FROSTFIRE burning experiment was carried out in 1999 to focus on the large-scale ecological consequences of fire. We observed significant dependence of fluxes of CO$_{2}$ and N$_{2}$O on soil temperature at depths of 5, 10, and 20 cm in burned and unburned black spruce forest soils. CH$_{4}$ fluxes also showed a weak exponential correlation with soil temperature at the three depths. The effect of soil temperature at the 5, 10, and 20-cm depths can be explained the maximum of 50%, 40%, and 35% of the variability of annual Q$_{10}$ values for both fluxes, respectively. Therefore, soil temperature appears to be one of the significant factors determining the soil-originated fluxes in boreal forests soils of central Alaska.
DE: 4805 Biogeochemical cycles (1615)
DE: 1615 Biogeochemical processes (4805)
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
DE: 0330 Geochemical cycles
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting