渓流水の化学特性から見た東丹沢の森林生態系への酸性沈着物の影響評価に関する予備的検討(若手研究者の初論文特集)

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It has been reported that the nitrate concentration in stream water in the mountainside on Mt. Oyama (1252m a.s.l), which is located at the western part of Kanagawa Prefecture, is higher than that in stream water in other regions, indicating that nitrogen saturation is occurring in the forested ecosystem. However, there has been no report on nitrogen saturation across the Tanzawa mountains, except Mt. Oyama. We investigated the current status of the stream water chemistry and the effect of acid deposition on the stream water chemistry across the East Tanzawa mountains. Thirty-eight samples were collected in nine mountain streams in this region. The mean pH and alkalinity in stream water in this region were 7.315 and 650μeq/L, respectively. There was no symptom of stream-water acidification by acid deposition in East Tanzawa, probably because of the high acid buffering capacity by the weathering of carbonate and silicate minerals. Nitrate concentrations in the stream water ranged from 27.6 to 87.8μeq/L and NH_4^+ was detected. High nitrate concentration in stream water suggests that nitrogen saturation is occurring in the forested ecosystem in East Tanzawa mountains. We divided our sampling sites into southeast (SE), southwest (SW), and north (N) regions by the ridge line of Mt. Tanzawa-Mt. Tonodake-Shindainichi-Mt. Sannoto-Mt. Takenodai-Mt. Oyama-Mt. Mitsumine. The stream water pH was lower and the concentrations of Na^+ and NO_3^- were higher in south regions. There were high correlations between the concentrations of Na^+(r=-0.854), Cl^-(r=-0.815) and N0_3^- (r=-0.922) and the distance from the coast of Odawara City, Oisomachi, and Ninomiyamachi. In addition, a high correlation between the N0_3^- and Cl^- concentrations (r=0.741), which is an indicator of atmospheric deposition, in stream water was observed. Our preliminary investigation indicates that the runoff of nitrate, originated from atmospheric deposition, might occur in the forested ecosystem in the southern regions in East Tanzawa.
社団法人日本分析化学会の論文
2007-09-05

渓流水の化学特性から見た東丹沢の森林生態系への酸性沈着物の影響評価に関する予備的検討(若手研究者の初論文特集)

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