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本文根据2014年春季(5月)、夏季(8月)、秋季(10月)天津近岸海域18个站位的海水质量监测数据,分析了海水中化学需氧量(Chemical Oxygen Demand,COD)的时空分布特征和海域富营养化状况,研究了COD与营养状态质量指数(NQI)的关系,浅析了赤潮生消过程中COD浓度的变化。结果表明,夏季COD高于春季和秋季,季节性差异显著;COD基本呈现近岸高外海低、南部高北部低的趋势;NQI指数的变化范围为1.68~12.50,平均值为4.46,富营养化严重;COD与NQI指数具有显著正相关性,一定程度上可以反映海域富营养化状况;COD与赤潮生物密度、Chl a呈极显著正相关关系,在反映赤潮生消过程中有重要作用。
Based on the monitoring data of seawater quality at 18 stations in the coastal waters of Tianjin in spring (May), summer (August) and autumn (October), the chemical oxygen demand (COD) And the eutrophication of the sea area, the relationship between COD and NQI was studied, and the change of COD concentration in the process of red tide generation was analyzed. The results showed that COD in summer was higher than that in spring and autumn, seasonal difference was significant. COD basically showed low in nearshore offshore and low in southern high. The NQI index ranged from 1.68 to 12.50 with an average of 4.46 and eutrophication The COD and NQI index had a significant positive correlation to a certain extent, which could reflect the eutrophication of the sea area. COD had a significant positive correlation with the density of red tide organisms and Chl a, which played an important role in reflecting the red tide generation and elimination.