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[B-6.3 Quantitative Analysis of Carbon Cycling in the Warm-Telperate Forests]

[Contact Person]

Kaneyuki Nakane
Department of Environmental Studies,
Faculty of Integrated Arts and Sciences, Hiroshima University
l-7-1 Kagamiyama, HigashiHiroshima, Hiroshima 724 Japan
Phone +81-824-24-6510, Fax +81-824-24-0758

[Total Budget for FY1990-1992]

10,469,000 Yen

[Abstract]

　The soil carbon cycling was observed in a warm-temperate deciduous forest and its clear cutting area in Hiroshima Pref., Japan from 1989 to 1993. The data was analyzed by a compartment and simulation models. The relative de composition rate of A₀ layer was larger in forest (0.42) than in clear cutting stands (0.27 y^-1). The value of the former was intermediate between those of beech (0.26) and evergreen oak forests (0.66 y^-1). The similar relationship was observed in the relative decomposition rate of humus in mineral soil between three forests. The most flow rates and accumulations decreased drastically just after the cutting. A₀ layer reached to its minimum 10 years. and recovered its most loss within 40-50 years after the cutting. The large minus of carbon balance just after cutting was obseved. The balance, however, change from minus to plus in 10 years after cutting. The loss of carbon from the forest stand following cutting recovered within 20 years, and nearly the same amount of carbon as that stocked in the timbers before the hervesting, accumulated in 70-80 years after the cutting. The calculation by the simulation model was done under the assumption that the increase of atmospheric CO₂ promoted the primary production at 10% during the last three decades, suggesting that about 9 tC ha^-1 was sunk into soils of the warm-temperate forest during the same piriod, indicating the posibility of forest soils as the main sink of atmospheric CO₂.

[Key Words]

Carbon budget, Carbon cycling, Missing sink, Simulation, Warm-temperate forest