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《Journal of Agro-Environment Science》 2013-07
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Ecological Environment Quality Assessment on Petrochemical Sewage Discharge Waters of Daya Bay in Winter

XU Jiao-jiao 1,2 , XU Shan-nan 1 , LI Chun-hou 1* , LIU Yong 1 , LIN Lin 1 (1.Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture, Key Laboratory of Fishery Ecology and Environment, Guangdong Province, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China; 2.College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China)  
Daya bay, a typical subtropical marine genetic resource pool in the South China Sea, is one of the most important inshore fisheries areas in Guangdong province. However, the marine environments has been threatened and effected by rapid developments of the petrochemical industry in recent years. In current study, the ecological environment quality has been assessed. Based on the ecological and environmental investigation in January 2012, the states of ecological environment quality of the Daya Bay petrochemical sewage discharge waters was assessed with four factors, including sea water quality, nutrient structure and level, sediment quality, primary productivity and food organism level. The comprehensive index method was used for integrated assessment, as well. The results show that most of the water quality factors, including dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, sulfide, phosphorus, dissolved inorganic nitrogen and heavy metals of Cu, Pb and Cd, were all conforming to Grade II of the National Sea Water Quality Standard of China. However, some factors, including petroleum hydrocarbon of 66.7% sites, pH of 91.7% sites, and Zn of several sites, exceed the Grade II of the National Standard with the average value of water quality comprehensive index at 1.215. The status of above factors consequently reached a low-level pollution without any pollution caused by organic pollutants. What makes unoptimistic is the concentration of nutrients in sea water is relatively high. Fortunately, the quality of sediment is very good and conforming to the Grade I of National Marine Sediment Quality Standard, with the com-prehensive pollution index at 0.478. Furthermore, the status of primary productivity reached the level of medium because of the high abundance of phytoplankton, zooplankton and benthic. According to the references and data of this study, the investigated petrochemical sewage discharge waters of Daya Bay was slight polluted by total petroleum hydrocarbons (TPHs), with the ecological environment comprehensive quality index of 1.129.
【Fund】: 国家自然科学基金项目(31100362);; 广东省科技计划项目(2009B030600002);; 热带海洋环境国家重点实验室开放课题(中国科学院南海海洋研究所 LTO1106);; 广东省低碳发展专项资金项目(2012-007)
【CateGory Index】: X826
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