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10,672,000 Yen (FY1995; 3,503,000 Yen)
The purpose of this study is to clear missing sinks on the terrestrial ecosystems, and establish a full-filled compartment model of carbon cycling in the Sasa type floor vegetation of cool-temperate forest ecosystem. The study area was situated at 1400 m a.s.1. on a northwest slope of Mt. Norikura in Takayama, Gifu Prefecture. Vegetation of study area was a secondary deciduous forest established after Fagus crenata forest was clear-cut. Presently vegetation was dominated by Quercus mongolica var. grosseserata and Betula platyphylla var. japonica and with forest floor of Sasa senanensis community. In this time we measured net production, root biomass, deposition rates and soil respiration of the studied forest ecosystem. Especially we estimated carbon cycling within Sasa community. Biomass of Sasa community in the study area was: 2.86 t.C/ha of above ground and 2.50 t.C/ha of below ground, and its net Assimilation was estimated as 1.09 t.C/ha per year. Annual total soil respiration was inferred as about 6.23 t.C/ha/year, where soil respiration was about 6,600 mgCO2/m2/day in May and 14,900 mgCO2/m2/day in July. It was clear that during snow period there was 110〜500 mgCO2/m2/day C02 flux released from snow surface, however, at the same time there was about 1,130 mgCO2/m2/day C02 flux released from soil surface which was 2〜10 times more than that from snow surface. This study has achieved remarkably in (1) to clear that the studied Sasa community being at a stable situation according to its biomass and net assimilation, and (2) to estimate quantitatively about the total soil respiration of the studied forest ecosystem. In spite of these, further studies are necessary for a full-filled compartment model of carbon cycle in this forest ecosystem.
Carbon cycling, Floor vegetation, Sasa community, Soil respiration