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Based on observations collected during 15 cruises from 2002 to 2007 and on his torical data, annual and seasonal variations in dissolved inorganic nutrients in the Changjiang (Yangtze) River estuary and the adjacent area were investigated.The impor tance of nutrients and nutrient fluxes to Harmful Algal Blooms (HABs) in the East China Sea (ECS) was also studied.The results showed an increasing trend in dissolved inorganic nitrogen (DIN) over the past fifty years.