中国南亚热带海岛海域沉积物重金属污染及潜在生态危害

Heavy metals contamination and potential ecological risk in the sediment of the sea areas around south subtropical islands,China.

根据中国南亚热带海岛生态特征及其地理分布,选取9个具有代表性的海岛,采用潜在生态危害指数法评价了南亚热带海岛海域沉积物中重金属(Cu、Pb、Zn、Cd、Cr、As、Hg)的潜在生态危害.结果表明:研究海域沉积物质量总体状况良好,但个别海域重金属含量较高,其中紫泥岛的Hg、内伶仃岛和上川岛的As均达到中度污染;紫泥岛Hg的潜在生态危害程度较高,达到中度危害;各海岛沉积物中重金属潜在生态危害指数与同期调查的大型底栖动物均匀度指数和生物量呈显著负相关关系,生态响应明显.

According to the ecological characteristics and geographical distribution of south subtropical islands,9 representative islands were selected in southern China.The method of Hankanson index was applied to assess quality status and potential ecological risk of heavy metals（Cu,Pb,Zn,Cd,Cr,As,Hg） in the sediments of the sea areas around these islands.The sediments quality of the study area was generally good,but the contents of Hg and As was slightly higher than reference values in some sea areas.Hg had medium potential ecological risk in the sea area of Zini Island.Pearson correlation analysis showed significantly negative correlation between values of RI and evenness index（J＇） as well as biomass of macrobenthic community,indicating the ecological response to heavy metals pollution.