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Received October 04, 1991,Revised , Accepted , Available online

Volume 4,1992,Pages 17-26

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The nutrient budget was measured during 1987.5-1988.4 and calculation was made according t0 the formula:M=Q·C.Chaohu Lake has a heavy allochthonous nutrient load:23.36 g N/m2 per year and 1.43 g P/m2 per year.The Nanfei River receives wastewater from the capital city—Hdei of Anhui Province and agricultural runoff from its suburbs,and those 38.5%TN load and 37.6%TP load of the total nutrient input.The nutrient load from all point sources contributes 40.1%for TN and 36.8% for TP of the total input.The control ofeutrophication ofChaohu Lake should reduce nutrient load from both point sources and nonpoint sources.

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