Eutrophication and red tide in coastal waters of Zhanjiang port

Through investigation of the environmental indices of coastal waters in the Port of Zhanjiang from 2002 to 2006,the water quality status,the annual variations of inorganic nitrogen and inorganic phosphorus concentrations in shallow and deep water,and the relationship between eutrophication and red tide are discussed.The causes of the eutrophication are also described.The results indicate that the water quality condition was good except for the high and increasing concentration of nitrogen and phosphorus,and the red tide is related not only with eutrophication and red tide organisms,but also with other factors.Finally,methods are presented for avoiding eutrophication and red tide.