島根大学生物資源科学部研究報告

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島根大学生物資源科学部研究報告 7
2002-12-20 発行

三瓶演習林における酸性雨長期モニタリング観測によるスギ人工林および落葉広葉樹林の林外雨、林内雨、樹幹流の科学的組成の変化

Long Term Trends in Acid Precipitation Chemistry of Cryptomeria Japonica Stands and a Deciduous Broad Leaved Forest in the Sanbe University Forest
片桐 成夫
葛西 絵里香
尾崎 嘉信
寺田 和雄
長山 泰秀
金子 信博
新村 義昭
ファイル
内容記述(抄録等)
The long term trends in acid precipitation chemistry of Cryptomeria japonica stands and deciduous broad leaved forest dominated by Quercus serrata were monitored in the Sanbe University Forest from 1996 to 2001. The values of pH in rainfall and through-fall showed the range of 5.1-5.6. They were larger than that in stemflow of 3.7-3.9 in C. japonica stands. On the other hand, the pH in through-fall and stemflow in the deciduous broad-leaved forest showed higher range than in rainfall. The ion concentrations, <Ca>^<2+>, <Mg>^<2+>, K^+, <Na>^+ and <NO_3>^- were higher in deciduous broad-leaved forest than C. japonica stands. The <SO_4>^^^<2-> concentration showed a reverse trend between both forests. The values of pH in rainfall and through-fall changed seasonally, and showed low value, 4.5 in winter and high value, 6.0 in spring. That in stemflow showed the same change as through-fall, but the range was lower by more than 1.0 in C. japonica stands. The <Na>^+, <Cl>^-, <NO_3>- and <SO_4>^^^<2-> concentrations were high in winter and low in summer. These were influenced by the north-west wind of monsoon in winter.