大连长兴岛及毗邻海域环境质量评价

根据2002年7月大连市长兴岛生态建设研究现场调查资料，探讨了长兴岛及毗邻海域水质和沉积物要素分布特征，评价了海域环境质量和营养状况。结果表明，水质和沉积物中重金属含量在近岸呈上升趋势，其中，水质Hg、Zn、Pb最高量值分别超过一类标准的0．64、0．54、0．30倍，沉积物中Cu最高量值超一类标准的0．20倍。水质营养水平指数E为0．08，NQI为1．04，cN／cP为2．50。海域环境质量总体良好，介于清洁与较清洁级之间，岛西部环境质量优于北部及南部，海域处于贫营养状态。海岛陆源污染物是影响海域环境的主要因素。

Assessment on environmental quality of Changxing Island in Dalian

According to the data of the ecology construction in Changxing island of Dalian in Jul. 2002, a study on the disitribution characters of the parameters in water and sediment was done. The assessment on the environmental quality and nutrition status were made. The result showed that the contents of the heavy metals in water and sediment were increased in the offshore. The maximum values of Hg, zinc and lead were above the First Class Standard, 0.64, 0.54, 0.30, respectively, and copper in the sediment was 0.20. The index of water nutrition level E was 0.08, NQI 1.04, and c_N/c_P 2.50. The envirtonmental quality is good condition, between the clean and relative clean. The envirtonmental quality was better in the west island than in the north and south of the island. The seawater was lack of the nutrients. The contaminations from the island was the main source.