HR: 0830h
AN: B31C-0302    [PDF]
TI: Methane consumption and soil respiration by a birch forest soil in West Siberia
AU: * Nakano, T
EM: nakanot@comp.metro-u.ac.jp
AF: Department of Geography, Tokyo Metropolitan University, 1-1, Minami-Osawa, Hachioji, Tokyo, 192-0397 Japan
AU: Inoue, G
EM: inouegen@nies.go.jp
AF: National Insititute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-0053 Japan
AU: Fukuda, M
EM: mfukuda@pop.lowtem.hokudai.ac.jp
AF: Institute of Low Temperature Science, Hokkaido University, N19W8, Kita-ku, Sapporo, Hokkaido, 060-0819 Japan
AB: Methane and carbon dioxide fluxes were measured in a birch forest soil in West Siberia, in August 1999, June 2000, and September 2000. The study site had a very thick organic horizon that was droughty during the observation periods. The soils always took up CH$_{4}$, while CO$_{2}$ was released from the surface to the atmosphere. CH$_{4}$ consumption and CO$_{2}$ emission rates ranged from 0.092 to 0.282 mg C m$^{-2}$ h$^{-1}$ and from 114.3 to 397.3 mg C m$^{-2}$ h$^{-1}$, respectively. The CH$_{4}$ consumption rate and soil temperatures showed significant relationships for individual measurements and monthly averages. The soil respiration rate weakly correlated with individual soil temperatures. Average temperatures for several hours prior to the flux measurement had higher correlations with both CH$_{4}$ consumption and soil respiration rates than did instantaneous temperature measured at the time of flux measurement, suggesting that soil temperature has a lag effect on both rates. Soil moisture and both fluxes showed no correlations. The limited variation of soil moisture during our observation may account for the lack of correlation. However, droughty soil conditions resulted in high gas diffusion and, consequently, high CH$_{4}$ consumption.
DE: 0315 Biosphere/atmosphere interactions
DE: 0330 Geochemical cycles
DE: 1610 Atmosphere (0315, 0325)
DE: 1615 Biogeochemical processes (4805)
SC: Biogeosciences [B]
MN: 2003 Fall Meeting