南通市近岸海域水环境质量评价

根据2005年12个月的监测数据,探讨了南通市近岸海域主要水环境要素的分布特点,评价了海域环境质量和营养状况。结果表明,水质呈弱碱性,有50%水域的D IN含量超过四类海水水质标准,PO4-P也有50%达到海水水质四类或超四类。从E值和A值的计算结果来看,监测的近岸海域2005年有92%处于富营养化状态,受中度和重污染的比例占23%。陆源污染是影响海域污染的主要因素。

Assessment on water environmental quality in offshore area of Nantong

Based on the monitoring data in 2005,the paper focuses on the characteristics of ocean environmental distribution of the offshore area in Nantong and the assessment of environmental quality and eutrophication.The results showed that the water quality was slightly alkaline,the DIN in 50 percent of the ocean area exceeded water standard grade Ⅳ,and the PO_4-P in 50 percent of ocean area reached or exceeded water standard grade Ⅳ.From the statistics of the values of E and A in 2005,92 percent of the offshore area was in the state of eutrophication, and 23 percent moderately and heavily pollutted.The main factor affecting the ocean pollution comes from the land.