由于沿海经济的快速发展,人为活动影响加重,长江口海区富营养化程度和范围逐年加重和扩大,已经成为我国有害赤潮高发区之一,有记录的赤潮事件约1/4发生在这个海区(周名江等,2003),从而引起了科学家们的高度重视。赤潮的发生很大程度上与营养盐时空分布特征密切相关(Hodgkiss et al.,1997)。 Due to the rapid economic development in the coastal area and the increasing influence of man-made activities, the degree and scope of eutrophication in the Yangtze Estuary area have been increasing and expanding year by year. They have become one of the high incidence areas of harmful red tide in China. Some 1/4 of recorded red tide events occurred in this area Zhou Mingjiang et al., 2003), which aroused great attention of scientists. The occurrence of red tide is closely related to the spatiotemporal distribution of nutrients (Hodgkiss et al., 1997).