惠州近岸海域水质营养盐含量分布状况与评价
Distribution and Evaluation of Nutrient Salt Content in Water Quality in Coastal Wa-ters of Huizhou

本文于2019年夏秋两季对惠州近岸海域20个站位进行采样检测，运用富营养指数法和有机污染指数法对近岸海域水质营养盐分布状况进行评价分析。调查结果显示：惠州近岸水质总体处于较好状态，夏季COD (1.09 mg/L)和DIN (0.151 mg/L)指标均小于秋季COD (1.75 mg/L)和DIN (0.298 mg/L)，夏季DO (8.20 mg/L)和DIP (0.009 mg/L)指标均大于秋季DO (7.98 mg/L)和DIP (0.006 mg/L)。水平分布上，夏季的COD、DIP和秋季的DO、DIP无明显分布差异，而夏季的DO、DIN和秋季的COD、DIN在局部近岸地区出现高值分布，整体上呈现近岸向远岸递减趋势。同时，富营养指数评价法与有机污染指数评价法的结果显示：夏季的富营养化以及有机污染程度均比秋季低。
A total of 20 stations in the coastal waters of Huizhou were sampled in the summer and autumn of 2019. Eutrophication assessment and organic pollution index were used to assess the distribution of nutrient salts in the coastal waters. The results showed that the water quality in the coastal area of Huizhou was in a good condition. The indexes of COD (1.09 mg/L) and DIN (0.151 mg/L) in summer were lower than those in autumn (1.75 mg/L and 0.298 mg/L respectively) , the indexes of DO (8.20 mg/L) and DIP (0.009 mg/L) in summer were higher than those of DO (7.98 mg/L) and DIP (0.006 mg/L) in au-tumn. In terms of horizontal distribution, there is no obvious distribution difference between COD and DIP in summer and DO and DIP in autumn, but DO and DIN in summer and COD and DIN in au-tumn have high value distribution in local nearshore areas, showing a decreasing trend from near-shore to far shore as a whole. At the same time, the results of eutrophication index and organic pol-lution index showed that the degree of eutrophication and organic pollution in summer was lower than that in autumn.