Fluxes Of Carbon Dioxide, Methane, And Nitrous Oxide In A Cool-Temperate Brackish Marsh

HR: 0800h
AN: B31B-0321 [Abstracts]
TI: Fluxes Of Carbon Dioxide, Methane, And Nitrous Oxide In A Cool-Temperate Brackish Marsh
AU: * Suzuki, S
EM: shizuo@ies.or.jp
AF: Department of Environmental Simulation, Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, 039-3212, Japan
AU: Inubushi, K
AF: Graduate School of Horticulture, Chiba University, 648 Matsudo, Matsudo, 271-8510, Japan
AU: Mitomi, T
AF: Graduate School of Science and Technology, Chiba University, 648 Matsudo, Matsudo, 271-8510, Japan
AU: Tani, T
AF: Department of Environmental Simulation, Institute for Environmental Sciences, 1-7 Ienomae, Obuchi, Rokkasho, Aomori, 039-3212, Japan
AU: Hirao, A S
AF: ZAX co., ltd., 1-74 Noduki, Obuchi, Rokkasho, Aomori, 039-3212, Japan
AU: Shiozaki, S
AF: ScienTec co., ltd., 1-7 Ienomae, Obuchi, Rokkasho, Aomori, 039-3212, Japan
AU: Sasaki, M
AF: ScienTec co., ltd., 1-7 Ienomae, Obuchi, Rokkasho, Aomori, 039-3212, Japan
AU: Yamamoto, A
AF: Institute of Biological Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-0006, Japan
AU: Mariko, S
AF: Institute of Biological Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-0006, Japan
AB: To estimate carbon and nitrogen emissions from a marsh ecosystem to the atmosphere, seasonal changes in CO₂, CH₄ and N₂O fluxes were monthly measured for a year using a closed chamber technique in a cool-temperate brackish marsh located at northern Japan. Vegetation of the brackish marsh was classified into Phragmites australis-dominated, Juncus tenuis-dominated and `miscellaneous' ones, often including tall-herbaceous species and dwarf trees. Ecosystem respiration rate and CH₄ flux depended positively on soil temperature, exponentially increasing with the rise of soil temperature. On the other hand, N₂O flux did not show the dependence on soil temperature, ranging from -0.49 to 0.73, from -0.50 to 0.34 and from -0.68 to 0.83 mg N m^-2 h^-1 for Phragmites australis-dominated, Juncus tenuis- dominated and `miscellaneous' vegetations, respectively. Nonlinear regression analysis with soil temperature showed that annual ecosystem respiration was 3.0 × 10², 2.3 × 10² and 7.1 × 10² g C m^-2 yr^-1 and annual methane emission was 6.4, 6.4 and 3.8 g C m^-2 yr^-1 for the three vegetations mentioned above, respectively.
DE: 0428 Carbon cycling (4806)
DE: 0438 Diel, seasonal, and annual cycles (4227)
DE: 0497 Wetlands (1890)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting