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依据2011年3月和9月在广西北海市铁山港附近海域进行的海洋环境综合调查结果,应用水质标准指数法、富营养化指数法、营养状态质量指数法和有机污染综合指数法对该海域的海水水质的现状和季节间的变化进行了分析和评价,结合历史资料探讨了主要污染因子在近30 a间的累年变化趋势。结果显示:该海域2011年3月和9月表层海水各评价要素中分别有部分超过一类海水水质标准,但基本符合海水水质二类标准,最主要的污染因子为无机氮、活性磷酸盐和化学耗氧量,主要污染区域位于铁山港和营盘港附近海域;近30 a间主要环境因子的变化趋势总体水平是逐渐增加的;该海域整体的富营养化水平处于季节性富营养化状态,春季为贫营养化,秋季为富营养化临界状态;该海域正处于开始受到有机污染的阶段。
According to the comprehensive marine environment survey conducted in March and September 2011 in the sea near Tieshan Port, Beihai, Guangxi, water quality index method, eutrophication index method, nutrition status index and organic pollution index The status quo of seawater quality in the sea area and the change between seasons were analyzed and evaluated. Based on the historical data, the trend of annual change of main pollution factors in the past 30 years was discussed. The results showed that some of the evaluation factors of surface seawater in March and September 2011 respectively exceeded one class of seawater quality standard, but basically met the second class standard of seawater quality. The main pollution factors were inorganic nitrogen, active phosphate and Chemical oxygen demand. The main pollution areas are located in the sea areas near Tieshan Port and Yingpan Port. The general trend of the major environmental factors in the past 30 years is gradually increasing. The overall eutrophication level of the sea area is seasonal eutrophication , Eutrophication in spring and eutrophication in autumn; the area is at the beginning of organic pollution.