摘要
根据2012 年5 月埒子口海域17 个站位的环境监测资料,采用地统计学方法分析表层沉积物中7 种重金属（As、Hg、Cu、Pb、Zn、Cr 和Cd）的空间分布特征,利用潜在生态风险指数法进行重金属生态风险评价.结果表明,埒子口海域表层沉积物重金属含量均达GB 18668-2002《海洋沉积物质量》中规定的1 类标准,质量总体较好.重金属空间分布趋势表现为西墅河口和灌河口附近海域重金属含量偏高,靠近外海-侧海域偏低,西北-东南向相关性较好;西墅河口和灌河口入海污染物是重金属的主要污染来源.重金属综合污染系数与潜在生态风险指数具有较好的相关性和一致性,总体处于低～中等水平.Cd 既是主要的重金属污染元素,也是重要的生态风险贡献因子.生态风险高值区主要分布在西墅河口和灌河口附近海域,说明排放入海的污染物对海洋生态环境影响较大.
Based on the environment monitoring data collected in May 2012 by the 17 monitoring stations in the Liezikou sea area,spatial distribution characteristics of seven heavy metals(As,Hg,Cu,Pb,Zn,Cr and Cd) in the surface sediments of the region were analyzed with the geostatistical method and their ecological risks assessed with the potential ecological risk index method. Results show that the contents of heavy metals in the sediments all meet with Grade I criteria of the ' National Standard of China for Quality of Marine Sediments'. On the whole,the surface sediments in the Liezikou sea area are generally good in environment quality. The high concentrations of heavy metals are mainly distributed in areas around the estuaries of the Xishu River and Guan River,while low concentrations in areas on the sea side off the coast.Spatial distribution trend showed a strong correlation between northwest and southeast in heavy metal concentration. Pollutants in the outflows from the Xishu River and Guan River were the main sources of heavy metal pollution. Good correlation and consistency was observed between integrated pollution coefficient and potential ecological risk index. Generally speaking,the Liezikou sea area lingers at low-moderate level of potential ecological risk. Cd is not only a major heavy metal pollutant,but also an important ecological risk contributor. High ecological risks lie mainly in the sea areas around the estuaries of the Xishu River and Guan River,which suggests that pollutants discharged with river water from the two rivers pose a great risk to the marine ecological environment.
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2014年第5期581-587,共7页
Journal of Ecology and Rural Environment
基金
国家自然科学基金(41373112)
关键词
埒子口
沉积物
重金属
空间特征
风险分析
Liezikou
sediment
heavy metal
spatial characteristic
risk analysis
