荣成湾水产种质资源保护区生态环境质量综合评价

Ecological environment quality comprehensive evaluation of national aquatic germplasm reserve in Rongcheng Bay

2015—2018年每年8月,对荣成湾国家级水产种质资源保护区表层海水中重金属、营养盐等环境因子连续监测调查,运用单因子指数法、综合质量指数法、有机污染指数法、富营养化指数法从不同方面分析了保护区的水质情况。结果表明,荣成湾保护区主要污染物质为Cd、Pb,水质总体符合二类海水水质标准;综合质量指数范围为0.202~0.615,评价等级为尚清洁状态;有机污染指数和富营养化指数变化范围分别为-0.853~1.133,0.00228~0.376,保护区未受到有机污染并处于贫营养状态;保护区DIN含量低于山东省近岸海域的平均值,57%的调查站位存在DIP限制,营养盐含量匮乏。

The environmental factors of nutrients and heavy metals in the surface seawater of Rongcheng Bay National Aquatic Germplasm Reserve were continuously monitored and investigated in Aug.each year from 2015 to 2018.The methods of single factor index,comprehensive quality index,organic pollution index and eutrophication index were used to analyze the seawater quality of the reserve from different aspects.Altogether,the reserve belonged to Class II seawater quality national standard and the main pollutants were Cd and Pb during 2015 to 2018.The comprehensive quality index ranged from 0.202 to 0.615 from 2015 to 2018.It meant that the reserve was at a slight clean state.The organic pollution index varied between-0.853 and 1.133 and the eutrophication index between 0.00228 and 0.376 in the reserve from 2015 to 2018.All of the investigation stations were at a nutrient-poor state during a period from 2015 to 2018.It showed that the reserve had not been polluted by organic matter and was at a poor nutrient state.In addition,the concentrations of DIN was lower than the average of Shandong coastal waters.In particular,57%of sampling stations existed DIP limitation.It meant that the reserve had suffered nutrients supply.