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 (332KB)
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13,220,000 Yen (FY1998 4,458,000 Yen)
Some kinds of problems which were pointed out on the international workshop for the project held in 1997 are resolving. All soil organic carbon (SOC) models with a similar formulation to RothC will have diffirculty in simulating SOC dynamics in Japanese andisols without adjustment. For RothC, satisfactory simulations of SOC dynamics using realistic inputs requires the IOM pool to be set at a much higher level than that used for most other soil types. Some ways of revising carbon process on RothC model were investigated using some data sets on andisols from Japan. Throgh simulations using the Century model. about 35 - 40% of SOC was decreased after clearing of forests on Andisols at Kanto district and at the same time was emitted into atmosphere. The decrease of SOC was stabilized and a new steady state was established under the modern cropping system. The new SOC level is 8,000 gC/m2 (4.5%) and almost equal to the SOC level (4,3%) of the experimental field of NIAES.
Soil carbon, Soil organic matter, Andisols, Modeling