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[C-3.3 Development of a Model for Estimation of Soil Acidification caused by Acid Deposition]

[Contact Person]

Junko Shindo
Division of Changing Earth and Agro-Enviornment
National Inst. of Agro-Environmental Sciences
Ministry of Agriculture, Forestry and Fisheries
3-1-1 Kannondai, Tsukuba, Ibaragi 305 Japan
Phone +81-298-38-8356, Fax +81-298-38-8199
E-mail shindo@ss.niaes.affrc.go.jp

[Total Budget for FY1993-1995]

19,439,000 Yen (FY1995 6,159,000 Yen)

[Abstract]

　The steady state mass balance model was applied to the Japanese ecosystem to estimate critical loads. Definition of an acidification criterion suitable for the ecosystem was crucially important for reliable estimation of critical loads. Weathering rates were derived from surface geology and soil types for critical loads estimation whose accuracy was examined based on the measurements of soil samples. Classification with surface geology was considered appropriate, however, the estimation had large uncertainty due to variability of measurement within a group. A dynamic model was developed to estimate soil acidification processes and was verified by applying it to soil acidification experiment using simulated acid rain.

[Key Words]

Soil acidification, Critical loads, Steady state mass balance model, Weathering rates, dynamic model