Assessments of spatial distribution of water quality in Lake Mizoro-ga-ike for water quality management

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  • 深泥池における水質管理に向けた水質の空間分布の把握
  • シンデイチ ニ オケル スイシツ カンリ ニ ムケタ スイシツ ノ クウカン ブンプ ノ ハアク

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Abstract

Lake Mizoro-ga-ike in Kyoto is a natural monument in Japan that contains a temperate floating mat bog and a diverse plant community. The lake has undergone eutrophication since the 1940s. Management to conserve the lake was begun in the 1960s. To evaluate the present condition of the lake, we investigated the quality of water collected in and around the lake in November 2005, 2006, and 2007 and the soil in the catchment forest in June 2006. The soil analyses indicated that the forest is nitrogen limited, and the water passing through the catchment is nutrient poor and suitable for conserving the lake. The water quality analyses indicated that the lake has three sources of pollution: water from a water purification plant to the southeast, contaminated water from a road that runs along the northern boundary, and sewage from a hospital to the northeast. Since January 2003, a pump has been used to deal with the effect of water leaking from the water purification plant. However, the condition of the lake did not change between 2003 and 2007 because the pumping is insufficient. Therefore, we cannot expect an improvement in the water quality unless a better pump is used.

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