天然記念物のウナギ生息地賢沼の水環境

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Acuatic environment in the KASHIKONUMA Pond was investigated for the multiplication of eelswhich have been designated as a natural monument by Ministry of Education since 1939.Through the measurements of rainfallwater level of the Pond and amount of drain from the Pondin 1997, it almost became possible that the water level and the amount of drain were predicted every- day with inputting of the rainfall.Chlorophyll-a,COD. PO^3-_4, NH^+_4 ,Ca^2+, Mg^2+. SO^2-_4 and N0^-_3 in the surface water of the Pond wereanalysed once a week in 1993. 1994. 1996 and 1997. The annual behaviour ofwatcr qualities was appearedreasonably. The aggravation of water qualities was measured in the early summer and autumn whenthe bottom water turned to spread into the Pond with nutrients. The annual mean of COD was about20 ppm, and chlorophyll a sometimes was over 100 μ g /ℓ . Though it was greatly decided by the weath- er of the year. the water qualities of the Pond became worse in every age.
福島工業高等専門学校の論文