陸水の酸性化における地質・水文条件の影響　　鉱物の化学的風化による中和作用の流域間比較

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書誌事項

タイトル別名
  • Effect of Hydrogeochemical Properties of Watersheds on Inland Water Acidification. Comparison of Acid-neutralization Due to Chemical Weathering between Acidified and Non-acidified Watersheds.
  • リクスイ ノ サンセイカ ニ オケル チシツ スイモン ジョウケン ノ エイキョウ コウブツ ノ カガクテキ フウカ ニ ヨル チュウワ サヨウ ノ リュウイキ カン ヒカク
  • Comparison of Acid-neutralization Due to Chemical Weathering between Acidified and Non-acidified Watersheds
  • 鉱物の化学的風化による中和作用の流域間比較

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抄録

In future, freshwaters in Japan are likely to become acidified by increasing acid deposition in eastern Asia. In order to predict the long-term acidification of freshwaters, it is necessary to evaluate acid neutralization mechanism in Japanese watersheds.<br>In this paper, an estimation method for acid-neutralization by chemical weathering is proposed, and applied to acidified and non-acidified watersheds in order to compare acid-neutralization mechanism. The principal results are :<br>(1) Japanese non-acidified watersheds receive approximately the same amount of acidic deposition as an acidified watershed in U.S.A..<br>(2) In Japanese non-acidified watersheds, acid deposition is neutralized by chemical weathering of primary minerals. On the other hand, in the acidified watershed, chemical weathering rates of primary minerals are much smaller than those in Japanese non-acidified watersheds. Therefore, acid deposition is not neutralized in this watershed.<br>(3) Typical properties of watersheds vulnerable to acidification are :<br>1) Dominant primary minerals in soil and bedrock are stable against acid deposition.<br>2) Soil thickness (weathering zone) is relatively small.<br>3) The ratio of chemical weathering ratio to acidic deposition is relatively small.

収録刊行物

  • 水環境学会誌

    水環境学会誌 22 (8), 655-662, 1999

    公益社団法人 日本水環境学会

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