福岡県の山間部における降水および渓流水のpHと数種の成分について(酸性雨特集(2))
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概要
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In two mountain regions (Yabe and Soeda) of Fukuoka prefecture pH value, electric conductance and concentration of potassium, calcium and magnesium were measured monthly since 1985. Average pH values of precipitation were about 4.9 in both regions. It means that acid rain is falling everytime in mountain region. Average pH values of stream water in Yabe and Soeda were 6.6 and 6.8 respectively. The pH value of the stream water was near the nuetral. Decrease of the pH value of stream water in Soeda was observed since 1988 and then in 1990 these values were about 0.7 less than the values in 1985. The cause of decrease of pH value of stream water in Soeda was not detected enough. The pH value of stream water in Soeda showed varience between sampling points. At the sampling point No. 5 the lowest pH value was observed everytime and at the sampling point No. 8 the highest one was observed. Relationships between pH, electric conductance and concentration of potassium, calcium and magnesium in monthly sampled precipitation and stream water were not observed. Relationship between pH value and concentration of potassium in stream water which samplled from 45 little watersheds showed negative corelation. The pH value of stream water in multiple layered forest was higher than the one in single-layer forest.
- 森林立地学会の論文
- 1991-06-30
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