HR: 11:20h
AN: B12B-05    [Abstracts]
TI: An Automated Chamber Network for Evaluation the Long-term Response and Feedback of Soil Carbon Dynamics to Global Change
AU: * Liang, N
EM: liang@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, IB 305-8506, Japan
AU: Kim, S
EM: sdkim@cnu.ac.kr
AF: Chungnam National University, Daejeon, Daejeon, 305-764, Korea, Republic of
AU: Shimoyama, K
EM: shimoyama.kou@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, IB 305-8506, Japan
AU: Kim, Y
EM: kimyw@iarc.uaf.edu
AF: 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, Kita 8, Nishi 5, Kita-ku, Sapporo, 060-0808, Japan
AU: Takagi, K
EM: kentt@fsc.hokudai.ac.jp
AF: Hokkaido University, Kita 8, Nishi 5, Kita-ku, Sapporo, 060-0808, Japan
AU: Fujinuma, Y
EM: fujinuma@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, IB 305-8506, Japan
AU: Mukai, H
EM: lnmukaih@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, IB 305-8506, Japan
AU: Takahashi, Y
EM: yoshiyu@nies.go.jp
AF: National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, IB 305-8506, Japan
AU: Kakubari, Y
EM: afykaku@agr.shizuoka.ac.jp
AF: Shizuoka University, Ohya 836, Shizuoka, 422-8529, Japan
AU: Wang, Q
EM: wangquan@agr.shizuoka.ac.jp
AF: Shizuoka University, Ohya 836, Shizuoka, 422-8529, Japan
AU: Nakane, K
EM: knakane@hiroshima-u.ac.jp
AF: Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima, 739-8521, 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. We have developed a multichannel automated chamber system that can be used for continuous measuring soil CO₂ efflux. The system equips 8 to 24 large automated chambers (90*90*50 cm, L*W*H). Since 1997, we have installed the chamber systems in the tundra in west Siberia, boreal forest in Alaska, cool- temperate and temperate forests in Japan, Korea and China, tropical seasonal forest in Thailand, and tropical rainforest in Malaysia. Annual soil CO₂ effluxes were estimated 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 30 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. From 2007, a big project that funded by Ministry of the Environment of Japan (MOE) has launched to evaluate the response and feedback of soil carbon dynamics of Japanese forest ecosystems to global change. We are installing another 6 chamber systems at the six of Japanese typical forests to conduct the soil warming experiments. For scaling-up the chamber experiments and understanding the mechanisms of soil organic matter (SOM) dynamics to global change, soil samples from about 100 forest ecosystems will be incubated for modeling development. Furthermore, the environmental (temperature and CO₂) controlled large open-top chambers have been employed to investigate the balance of SOM (the input from litter falls and loss due to the decomposition) of forest ecosystems with global change.
DE: 0400 BIOGEOSCIENCES
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 0429 Climate dynamics (1620)
DE: 0439 Ecosystems, structure and dynamics (4815)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting