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 (326KB)
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18,844yen (FY 1998 : 5,856yen)
Carbon dynamics, Mathematical model, Soil ecosystems
Recent increase of atmospheric CO2 is mainly attributed to the disturbances of global carbon dynamics caused by anthropogenic activities including excessive usage of fossil fuel and deforestation. Soil ecosystems have been focused on as a key of "missing sink problem". Also the climate change itself would affect the soil ecosystems through change of soil respiration rates due to increase of temperature. To make clear the overall scheme of carbon dynamics in the soil ecosystems, a carbon dynamics model is proposed which is, in principle, a substantial model based on mass balance and kinetics of carbon. Soil was divided into twelve typical types and the soil respiration rate system of each soil was described in terms of local soil types. The terrestrial surface was divided into meshes of latitude 0.5 x longitude 0.5. Calculations were carried out for all the meshes and for each mesh. This procedure provides the soil carbon dynamics based on the present geographical information. The model could simulate the soil carbon dynamics with reasonable accuracy and it also can predict effect of climate change on soil carbon dynamic.