海南岛八门湾红树林湿地表层沉积物重金属分布特征及污染评价

摘要

文章研究了海南岛八门湾红树林湿地表层沉积物的重金属含量及分布特征，并运用沉积物富集系数法和潜在生态风险指数法进行了富集评价和生态风险评价.结果表明：沉积物中的金属除Cd、As外，均未发生明显的富集和累积.湿地内重金属潜在生态风险指数（RI∈（148.17，799.66）），整体上处于高生态风险水平.其中Cd的潜在生态风险最大，As次之，其他5种重金属Cr、Ni、Cu、Zn和Pb仅具有轻微生态风险.湿地的部分区域存在对重金属的沉积和富集的“聚集区”，因此在湿地的治理保护过程中对重金属“聚集区”应予以关注，同时也应重点监控沉积物中Cd与As的治理.%This paper analyzed the content and seasonal distribution characteristics of heavy metals in the surface sedi⁃ments of Bamenwan mangrove wetland, Hainan Island, and evaluated the pollution and ecological risk of these heavy metals by Enrichment coefficient method and Hakanson potential ecological risk index method. The results showed that Cd, As, oth⁃er metals in sediments did not significantly enrich and accumulate. Heavy metal potential ecological risk index (RI∈(148.17,799.66))in the wetlands, was in a high level in terms of ecological risk as a whole. Among these ecological risk Cd has the greatest potential ecological risks and As was slightly lower with the other five kinds of heavy metals Cr, Ni, Cu, Zn and Pb of only slight ecological risk. There is some area of wetlands and deposition of heavy metals enrichment"gathering ar⁃ea"and therefore in the process of governance to protect the wetlands、heavy metal"gathering area"should be concerned about, and Cd and As should be particularly focused in sediment monitoring.