East China Sea, The Main Sources Of Chemical Pollutants And Nearly 30 Years, Discharging Into The Sea Fluxes

With the high development of economy and fast increase of population along the East China Sea, chemical pollutants fluxes flowing into the East China Sea are increasing continually, which make water quality of the East China Sea worse, ecosystem unbalanced and red tide disaster happen frequently. This paper is designed to study the change of chemical pollutants fluxes flowing into the East China Sea over past twenty-five years. A quantity of data is gathered. Runoff of the Changjiang River, Qiantang River and Min River and breed aquatics area of Zhejiang Province, Fujian Province, Jiangsu Province and Shanghai are analyzed. The methods of calculating the fluxes of different pollution source flowing into the East China Sea are established. Yearly Pollutants fluxes from river, sewage meatus, breed acquatics and agriculture non-point sources are calculated. Pollutants fluxes of air deposition adopt yearly average value. Yearly fluxes of nutrients, oil and COD from the early 1980s to the early 21st century flowing into the East China Sea are analyzed. The sources of every pollutant are studied. Yearly pollutant fluxes into the East China Sea are calculated and the proportions of pollutant origin are compared, which is important and essential for the researching and protecting the ecosystem of the East China Sea.Since the early 1980s to the early 21st century, the trend of inorganic nitrogen (DIN) flowing into the East China Sea have been increasing. In detail, the flux is about 8.0×105 t·a-1in early 1980s, and then increases to about 2.6×106t·a-1t in 2005. The yearly increasing rate is about 4.8%. The trend of phosphate (PO4-P) flowing into the East China Sea is as same as the DIN's. In detail, the fluxes is about 1.7×104t·a-1in the early 1980s, and to about 3.1×104t·a-1in the medium 1990s, and then increases rapidly to about 7.0×104t·a-1in 2005. The yearly increasing rate is about 5.8%. The flux of chemical oxygen demand (COD) flowing into the East China Sea has been increasing from the early 1980s to the early 21st century. In detail, the flux is about 7.1×106 t·a-1 in the early 1980s, and then increases to about 12.3×106t·a-1 in 2005. The yearly increasing rate is about 2.2%. The trend of oil flowing into the East China Sea is shape of"N". In detail, the flux is about 8.7×104t·a-1 in the early 1980s, and increases to about 10.0×104t·a-1, then decreases to 6.5×104t·a-1in the medium 1990s. And then the flux increases to 8.9×104t·a-1 in the early 21st century.Pollutant sources of nutrients and COD include river, sewage meatus, breed aquatics, air deposition and agriculture non-point sources. Oil pollutant sources include river, sewage meatus, and the pollution sources from sea. Of all the sources, the proportion of river is the largest which is about 46~82%. The proportions of other pollution sources are different for different pollutant. The proportion of air deposition is around 17~27%, which contribute little to PO4-P flux.