Notice of Retraction: Characteristics of Nutrients Variation in Bohai Bay, China - A Five Years Study

Abstract

Water samples were collected in 17 stations in the Bohai Bay of china to analyze the distribution of dissolved nutrients and assess the situation of eutrophication. According to the monitoring data of August 2008, the DIN appeared high values near Beitang, Haihe, Dagu estuary area and Dagang coastal area, which indicated that the DIN pollution took on expanding trend relative to 2003. High values of DIP were concentrated at Beitang estuary and Hangu coastal area in 2008. The average concentrations of DIN were high both in 2004 and 2008 while the DIP concentrations varied little during the five years. The seawater nutrients limitation factor was phosphorus still and the seawater is under DIN contaminative condition in this period. Seawater quality in Bohai Bay was well-balanced in from 2004 to 2007 and low-grade eutrophicated in 2008. It indicated that DIP and COD nutrients have little threat to eutrophication while DIN pollution trend was not optimistic in Bohai Bay.