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根据2004~2006年进行的连续监测结果,分析、探讨了渤海湾赤潮监控区表层海水营养盐的污染现状、变化规律及其结构特征。结果表明:近年来,渤海湾赤潮监控区海域受到了DIP、DIN污染,水体处于严重的富营养化状态,且DIN的污染程度明显高于DIP;除个别项目外,渤海湾赤潮监控区以S4站营养盐含量最高,原因是S4站靠近河口,大量生活污水排放所致;在赤潮多发期,表层海水N、P、Si含量存在明显的月变化特征。6月份营养盐含量最低,8月份最高。年际变化表明:NH4-N的年际变化最为明显,表现为逐年递减的趋势,而SiO3-Si的年际变化最小。赤潮监控区DIN一直处于热力学平衡状态,NO3-N占DIN含量的57%~78%。近年来DIN/PO4-P和SiO3-Si/PO4-P逐年增加,而SiO3-Si/DIN则逐年降低。
According to the continuous monitoring results from 2004 to 2006, the status quo, change and structural characteristics of surface seawater nutrient pollution in the monitoring area of red tide in the Bohai Bay were analyzed. The results show that in recent years, the sea area of the monitoring area for red tide in the Bohai Bay has been polluted by DIP and DIN. The water body is in a serious eutrophication state and the pollution level of DIN is obviously higher than that of DIP. Except for a few projects, The highest nutrient content is due to S4 station near the mouth of the estuary, which is caused by the discharge of a large amount of domestic sewage. During the frequent occurrence of red tide, the monthly N, P and Si contents of surface seawater have obvious monthly variation characteristics. Nutrient content was the lowest in June and highest in August. The interannual variation shows that the interannual variation of NH4-N is the most obvious, showing a declining trend year by year, while the interannual variation of SiO3-Si is the smallest. The DIN monitoring zone has been thermodynamically balanced, with NO3-N accounting for 57% to 78% of the DIN content. In recent years, DIN / PO4-P and SiO3-Si / PO4-P increased year by year, while the SiO3-Si / DIN decreased year by year.