京都盆地の山間部における土壌緩衝能の経年変化(1992-2004)

概要

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Altitudinal differences, seasonal and annual changes in the soil pH and chemical compositions were investigated using soil samples collected from Mt. Hiei between 2000 and 2004. The mean values of the soil pH were pH 3.5∼4.0 at altitudes of around 350 m and 550∼650 m, and the molar ratios of BC/Al were also low. However, the concentrations of sulfate and chloride ions were high. The values of the soil pH in 1994 were lower than those in 2000. The difference in the soil pH with the altitude of Mt. Hiei in 1994 was especially big. The BC/Al ratios in 2000 were lower than those in 1994. A decline in the BC/Al ratios was also observed at Mt. Ogura, Mt. Kinugasa and Mt. Daimonji from 1992 to 2000. A decline in the buffering capacities of soils from mountains in Kyoto City may be due to acid deposition.
2009-04-05