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- W2116003485 abstract "The water chemistry, the nutrient budget and the phytoplankton and its production in Lake Norrviken, Central Sweden, was studied for one year in 1961–62. In this paper the chemical factors and the nutrient budget are presented. The phytoplankton and its production will be treated in a second paper. Lake Norrviken receives waste water from a yeast factory and sewage from communities involving about 1300 people. Heavy blooms of blue-green algae occur. The oxygen conditions in the lake are extremely unsatisfactory. Almost the entire water mass becomes oxygen-free during the winter under the ice-cover. The concentrations of nitrogen and phosphorus compounds in the lake water are high. The dominating form of nitrogen is ammonia and of phosphorus inorganic phosphate, except in surface water during the summer when the major part of nitrogen and phosphorus is bound in the plankton. The main source of the nutrient income to the lake is the waste water from the yeast factory, which is responsible for more than 80% of the nitrogen and 70% of the phosphorus. Only about 40% of the nitrogen and 50% of the phosphorus income to the lake leaves the lake through its outflow. The rest of the phosphorus is accumulated in the sediments but a large fraction of the nitrogen is presumed to undergo denitrification to free nitrogen. On the basis of the ratio of the content of nitrogen to phosphorus in surface sediment this fraction has been calculated to be about 37% of the total nitrogen income to the lake or 60% of the amount which does not leave the lake through the outflow." @default.
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- W2116003485 date "1967-03-01" @default.
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- W2116003485 title "Limnological studies of lake Norrviken, a eutrophicated Swedish lake" @default.
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- W2116003485 doi "https://doi.org/10.1007/bf02502198" @default.
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