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[B-6.2 Quantitative Analysis of a Carbon Cycle in Natural Terrestrial Ecosystems in Cool Temperate Region]

[Contact Person]

Akio TAKENAKA
Global Warming Mechanism Research Team,
Global Environment Division,
National Institute for Environmental Studies
Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305 Japan

[Total Budget for FY1990-1992]

26,441,000 Yen

[Abstract]

　Basic data of the carbon cycling in a broadleaved deciduous forest in cool temperate region of Japan was collected in 1991 and 1992. Amounts of plant litter on and in the soil, soil organic matter, and living plant parts below ground were measured. More-over, rates of carbon flux were measured for litter fall, decomposition of plant litter, and release of CO₂ from the soil surface. More than 90% of non-living organic carbon was represented by soil organic carbon. Dead logs represcnted ca. 80% of organic carbon in plant litter. CO₂ flux from the soil surface was shown to closely follow the air temperature. The temperature dependencies of the CO₂ flux varied with season. Large among-site variation was observed even within points only a few meters apart.

[Key Words]

Carbon Cycling, Cool Temperate Region, Forest Ecosystem, Broadleaved Deciduous Forest, CO₂ Flux from Soil