【摘要】 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。更多还原

【Abstract】 Based on the data obtained in the coastal waters of the Guangxi Beihai Tieshan port coastal area in Match and September 2011, studied the distribution characteristic of temperature, salinity, p H, dissolved oxygen, COD, DIN, PO₄^3--P and petroleum hydrocarbons, and evaluated the nutrient level and organic pollution situation by using methods such as water quality standards index, eutrophication index, nutrient quality index and water organic pollution evaluation index. Combined with historical data and discussed the trend of major pollution elements in this area. It is shown in the results that the evaluation elements in sea water of Tieshan port coastal area are in accord with the second class of the sea water quality standard of National Standards, and the main pollution are inorganic nitrogen, active phosphate and chemical oxygen demand. The content of main pollution is increased gradually during the past 30 years. At present, the whole sea area of Tieshan port was in a critical state eutrophication level of autumn which was a seasonal eutrophication, and the organic pollution degree remained at the second level in September 2011, which indicated that the water area has polluted by organic materials.更多还原