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[B-1.8 Research on the Modeling of the Carbon Budget of Temperate Forest by the Field Measurements of CO₂ Flux(Final Report)]

[Contact Person]

Susumu Yamamoto
Environmental Assessment Dept., National Institute
for Resources and Environment, AIST ,MITI
Onogawa 16-3,Tsukuba,Ibaraki 305, Japan
Phone +81-298-58-8360, Fax +81-298-8358
E-mail yamas@nire.go.jp

[Total Budget for FY1993-FY1995]

41,117,000 Yen (FY1995; 13,749,000 Yen)

[Abstract]

　The fluxes of CO₂ between air and temperate forest were estimated by the field measurement of CO₂ concentration and meteorological conditions using a tower sited in the temperate forest. The fluxies of CO₂ were calculated according to the eddy correlation and aerodynamic methods , and diffusion coefficient was determined from the comparison of their results . The seasonal variation of fluxes and the relation between them and meteorological conditions were investigated. The uptake rate of CO₂ in this temperate forest was positive(uptake by vegetation) from May to September and negative (release to the air) from October to April.
　Annual net uptake was 460 gCO₂/m² from October '93 to September '94 and 210 gCO₂/m² from October '94 to September '95.

[Key Words]

Temperate Forest, CO₂ Flux , Photosynthesis, Tower Measurement, Carbon Cycle