Abstract
In order to evaluate the buffer capacity of watershed to acid deposition, it is necessary to make clear both the pathway of precipitated water and the accompanying chemical change of the water. We observed temporal variations in the chemistry and 180 content of the streamwater during a storm and divided the discharge into baseflow and precipitated water. The streamwater chemistry is explained by assuming the temporal variation of baseflow chemistry.The following 2 mechanisms are supposed:(1) soilwater, which has different chemistry and buffercapacity from groundwater, is the source of storm runoff.(2) soilwater and/or groundwater chemistry changes in the pathway to stream.
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