Abstract:The successive data of environmental factors such as nutrients and heavy metals in the surface water of Jinghai Bay Trachidermus fasciatus Heckel National Aquatic Germ Plasm Resources Conservation Area in the summer of 2014 to 2016 were used to evaluate the ecological environment quality of the survey area by the comprehensive quality index method. The organic pollution index, the potential eutrophication assessment and the principal component analysis were employed to analyze the water trophic status, the organic pollution, and the main pollution factors. The results showed that the comprehensive quality index of seawater in Jinghai Bay was 1.04~1.69. The water quality in this area was light pollution based on the relationship between the comprehensive quality index and environmental classification. The range of organic pollution index was 4.66~9.23 in 2014 to 2016, which was serious organic pollution based on the relationship between the organic pollution index and the organic pollution classification in seawater. According to the nutrition evaluation model, the nutrients levels of the survey area were rich nutrient in 2014 and potential rich nutrient with limited nitrogen in 2015 and 2016. The principal component analysis showed that DIN, As and Zn were the main environmental factors affecting the water quality of this survey area, which represent the pollution status of Jinghai Bay Trachidermus fasciatus Heckel National Aquatic Germ Plasm Resource Conservation Area from 2014 to 2016. Thus, we should pay more attention to the nutrients, organic pollution and heavy metal (As and Zn) in the process of environmental monitoring and project.
