Effect of anthoropogenic contamination on the water quality of Lake Oze
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概要
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In order to clarify the effect of anthropogenic contamination on the water quality of Lake Oze, we investigated the water quality in the surrounding Oze wetland at 10 sampling stations (including Lake Oze) between 1999 and 2002. We found that the eutrophication of the lake was accelerated by elevated levels of NO<SUB>3</SUB><SUP>-</SUP>-N and PO<SUB>4</SUB><SUP>3-</SUP>-P, and that the Nushiri River was contaminated with total coliforms. Both contaminations were caused by drainage from septic tanks in the Oze area. The contamination from organic matter, indicated as COD or BOD, was detected during cold weather, probably due to the impaired efficiency of septic tanks under low temperature. By contrast, during warm weather, it is suggested that nutrients such as DIN are released through the decomposition and remineralization of organic matter in the tanks. Thus the eutrophication in Lake Oze is attributable to the these loading of the released nutrients.
- 日本陸水学会の論文
日本陸水学会 | 論文
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