近年来,随着沿海城市工农业的高速发展,大量含有氮、磷等营养元素的污水排入大海,导致海水富营养化的加剧,有毒藻类赤潮分布范围及出现频率明显增加.1997年7～12月我国东南沿海水面首次发生大规模的棕囊藻类(Ｐｈａｅｏｃｙｓｔｉｓ)有毒赤潮,其持续时间长,危害大,给水产... In recent years, along with the rapid development of industry and agriculture in coastal cities, a large amount of sewage containing nutrients such as nitrogen and phosphorus is discharged into the sea, leading to the aggravation of seawater eutrophication and the distribution range and frequency of toxic algae blooms increased markedly. In December, large-scale poisonous red tide of Phaeocystis occurred for the first time along the southeastern coast of China, which lasted for a long time and caused great harm to aquatic products.