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General Session 4: Marine environment, ecosystem & sustainability |
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Accumulation and partitioning of POPs and trace metals in nine mangrove species and sediments from three estuarine wetlands of Hainan island, south China
GS4-28
Yaowen Qiu* , State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, CAS
Presenter Email: yqiu@scsio.ac.cn
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| Mangrove wetlands have been used for treating municipal, livestock and industrial wastewaters and even mine drainage. Hainan Island has mangrove areas of 4772 hm2, accounting for one third of the total mangrove forest areas of China. Hainan Dongzhai Harbor Mangrove Protection Zone, as the first National Mangrove Reserve of China, was established in 1986 and was listed as the Ramsar wetland in 1992. Here, persistent organic pollutants (POPs, e.g., PAHs, OCPs, PBDEs and DP) and trace metals (Cu, Pb, Zn, Cd, Cr, Hg and As) in mangrove tissues (leaf, branch, root and fruit) of nine species and sediments samples collected from Dongzhai Harbor, Sanya Bay and Yalong Bay, Hainan Island were analyzed. The average concentrations of Cu, Pb, Zn, Cd, Cr, Hg and As in surface sediments were 14.8, 24.1, 57.9, 0.17, 29.6, 0.08 and 9.7 µg/g, whereas those in mangrove tissues were 2.8, 1.4, 8.7, 0.03, 1.1, 0.03, and 0.2 µg/g, respectively. The dominant PAH congener in sediment was naphthalene, while in tissues were phenanthrene. Compared to those from other typical mangrove wetlands of the world, the POPs and metal levels in Hainan were at low- to median-levels, which is consistent with the fact that Hainan Island is still in low exploitation and its mangroves suffer little impact from human activities. Metals concentrations among different tissues of mangroves were different. In general, Zn and Cu were enriched in fruit, Hg was enriched in leaf, Pb, Cd and Cr were enriched in branch, and As was enriched in root. The cycle of POPs and trace metals (including in the standing stock, the annual absorption, the annual net retention, the annual return and the turnover period) in mangroves were estimated, and their biota-sediment accumulation factors (BSAFs) were also calculated. |
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