HR: 1340h
AN: B43A-0248    [Abstracts]
TI: Temporal and Spatial Variations in Soil CO₂ Effluxes of Different Ecosystems
AU: * Liang, N
EM: liang@nies.go.jp
AF: CGER, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Iba 305-8506 Japan
AU: Kim, S
EM: sdkim@cnu.ac.kr
AF: Chungnam National University, Daejeon 305-764, Daejeon, Dae 305-764 Korea, Republic of
AU: Shimoyama, K
EM: shimoyama.kou@nies.go.jp
AF: CGER, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Iba 305-8506 Japan
AU: Kim, Y
EM: kimyw@iarc.uaf.edu
AF: IARC, University of Alaska Fairbanks, 930 Koyukuk Dr., P.O. Box 757335, Fairbanks, AK 99775-7335 United States
AU: Hirano, T
EM: hirano@env.agr.hokudai.ac.jp
AF: Hokkaido University, Sapporo 060-0809, Sapporo, HOK 060-0809 Japan
AU: Takagi, K
EM: kentt@exfor.agr.hokudai.ac.jp
AF: Hokkaido University, Sapporo 060-0809, Sapporo, HOK 060-0809 Japan
AU: Suto, H
EM: suto.hiroshi@nies.go.jp
AF: CGER, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Iba 305-8506 Japan
AU: Fujinuma, Y
EM: fujinuma@nies.go.jp
AF: CGER, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Iba 305-8506 Japan
AU: Inoue, G
EM: inouegen@nies.go.jp
AF: CGER, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Iba 305-8506 Japan
AB: Regional networks for measuring carbon sequestration or loss by terrestrial ecosystems on a year round basis have been in operation since the mid-1990s. However, continuous measurements of soil CO₂ efflux, the largest component of ecosystem respiration have only been reported over similar time scales at a few of the sites. Reasons include the lack of automated measurement systems that are commercially available, and the need for frequent servicing to ensure accurate measurements. We have developed a multichannel automated chamber system that can be used for continuous measuring soil CO₂ efflux during snow-free seasons. We installed the chamber systems in boreal forest in Alaska, tundra in west Siberia, temperate and cool-temperate forests in Japan and Korea, tropical seasonal forest in Thailand, and tropical rainforest in Malaysia. Annual soil CO₂ efflux were measured to be about 5-6 tC ha^-1 y^-1 in the boreal and cool-temperate forests, 10 tC ha^-1 y^-1 in the temperate forests, and 26 tC ha^-1 y^-1 in the tropical rainforests. Efflux showed significant seasonality in the boreal and temperate forest that corresponding with the seasonal soil temperature. However, the wavelike efflux rates in the tropical forests were correlated with the seasonality of soil moisture. Soil CO₂ efflux of forest ecosystems showed large spatial variation and was correlated with vegetation type and the chamber size.
DE: 0428 Carbon cycling (4806)
DE: 0439 Ecosystems, structure and dynamics (4815)
DE: 0452 Instruments and techniques
SC: Biogeosciences [B]
MN: Fall Meeting 2005