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[B-1.3.4 Quantitative Analysis of Carbon Cycling in Pasture]

[Contact Person]

Shigeo Takahashi
Dep. of Ecology, National Grassland Research Institute
Sembonmatsu 768, Nishinasuno, Nasu, Tochigi, 329-27 Japan
Tel 0287-36-0111 (Ext.275), Fax 0287-36-6629
E-mail taka@ngri.affrc.go.jp

[Total Budget for FY1993-FY1995]

8,767,000 Yen (FY1995;3,591,000 Yen)

[Abstract]

　An attempt is being made to measure the flow rates of carbon pathways and CO₂ gas fluxes in grazing pastures to clarify the mechanism of carbon cycling.
　Production rates of pasture plant roots were higher during the spring. And the decomposition rates were approximated by a function of soil temperature.
　CO₂ gas fluxes in grazing pastures were measured directly by eddy correlation method. In the daytime, CO₂ absorption fluxes to grassland(downward) were observed and on the contrary at night CO₂ emission fluxes to atmosphere(upward) were observed.
　In 1993, the amount of CO₂ absorbed by grassland were larger than the amount of CO₂ emitted to atmosphere per diem during the measuring period in spite of cool summer and less solar radiation. In 1994, we obtained the reverse carbon budgets especially on very hot days, which resulted from the different fluctuation pattern of the CO₂ gas fluxes. But the amount of CO₂ absorbed by grassland were larger than the amount of CO₂ emitted to atmosphere per diem as observed in 1993 on many days during the year.
　Therefore it is suggested that grassland has possibility of being a sink of carbon.

[Key Words]

Pasture, Carbon Budget, Pasture Plant Root,CO₂ Gas Fluxes, Eddy Correlation Method