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6,156,000 Yen (FY1998; 1,988,000 Yen)
In order to know carbon cycling in a cool-temperate forest, net ecosystem production(NEP) was examined in a broad-leaved deciduous forest accompanying Sasa senanensis as floor vegetation in Takayama experiment forest of Gifu University at 1400m a,s.l. Carbon uptake in Sasa floor vegetation became positive in early spring and late autumn only while deciduous trees drop leaves and season free from snow fall. Sasa layers expected to fixed 1.18 tor, of carbon per year per hectar. 1,868 trees are growing in the forest, which have 186.4 ton/ha of the total dry matter including belowground parts. Radius analysis clari-fied that 4.05 ton/ha of carbon is fixed by tree layers in a year.
Carbon flux from soil was measured continuously and it was found that soil released 5.61 tonC/ha¼§yr. Summing up whole carbon budget through the cool-temperate forest eco-system, overall NEP was esti-mated as 2.19 tonC/ha¼§yr. These relations were expressed in a compart-ment model. Both inorganic and organic environmental factors such as light penetration system, or biomass distribution in the experiment forest, were examined to validate the model. Although, prediction model of carbon cycling was not completed because of too short period for forest examination, fundamental data was prepared needed for a dynamic model construction. And several important facts are clarified through the experiments.
Broad leaved deciduous forest Carbon cycle, NEP, Sasa senanensis, Soil respiration