Distribution, Fraction, and Ecological Assessment of Heavy Metals in Sediment Plant System in Mangrove Forest, South China Sea

作者：Li, Ruili; Chai, Minwei^*; Qiu, Guo Yu^*

来源：PLos One, 2016, 11(1): e0147308.

DOI：10.1371/journal.pone.0147308

• SIMULTANEOUSLY EXTRACTED METALS
• ACID-VOLATILE SULFIDE
• SURFACE SEDIMENTS
• RISK-ASSESSMENT
• COMPREHENSIVE ASSESSMENT
• QUALITY GUIDELINES
• SPATIAL VARIATION
• MARINE-SEDIMENTS
• MIYUN RESERVOIR
• BOHAI BAY

Overlying water, sediment, rhizosphere sediment and mangrove seedlings in the Futian mangrove forest were analyzed for heavy metals. The results showed that mangrove plant acidified sediment and increased organic matter contents. Except for chromium (Cr), nickel (Ni) and copper (Cu) in Aegiceras corniculatum sediment, heavy metals in all sediments were higher than in overlying water, rhizosphere sediment and mangrove root. Heavy metals in Avicennia marina sediments were higher than other sediments. The lower heavy metal biological concentration factors (BCFs) and translocation factors (TFs) indicated that mangrove plant adopted exclusion strategy. The geo-accumulation index, potential ecological risk index and risk assessment code (RAC) demonstrated that heavy metals have posed a considerable ecological risk, especially for cadmium (Cd). Heavy metals (Cr, Ni, Cu and Cd) mainly existed in the reducible fractions. These findings provide actual heavy metal accumulations in sediment -plant ecosystems in mangrove forest, being important in designing the long-term management and conservation policies for managers of mangrove forest.

• 出版日期2016-1-22
• 单位深港产学研基地; 北京大学深圳研究生院; 北京大学