生态环境学报Issue(3)：469-475,7.DOI:10.16258/j.cnki.1674-5906.2015.03.015
深圳湾红树林沉积物-植物体系汞的分布规律和形态分配特征
Distribution and Speciation of Mercury (Hg) in Futian Mangrove Wetland, Shenzhen Bay
摘要
Abstract
A study quantifying mercury (Hg) distribution and speciation in a continuous system of bulk sediment, rhizosphere sediment, and mangrove species was donducted in Futian mangrove forest, Shenzhen Bay. Sequential extraction procedure was applied to investigate Hg speciation in sediments. The results indicated that Hg concentrations in bulk sediments and rhizosphere sediments were higher than mangrove seedlings. Hg concentrations were lower in stems than that in leaves and roots. Among the three species analyzed in this study, the native species exhibited higher Hg accumulation. InAvicennia marina seedlings, Hg concentration was 45.32 ng·g-1, and 23.49 ng·g-1 inAegiceras corniculatum. The bioconcentration factors and translocation factors showed that the mangrove species were inclined to adopt the metal exclusion strategy due to the plant self-protection from heavy metal stress. Hg speciation in non-rhizosphere sediments followed this order: HgORG>HgVOL>HgR>HgEX>HgCAR>HgFM. Hg speciation in rhizosphere sediments were HgVOL>HgORG>HgR>HgFM>HgEX>HgCAR. Overall, the bioavailable and potentially bioavailable speciation were found in a higher proportion, whereas non-bioavailable speciation was less. Compared with the native species, the introduced speciesSonneratia caseolaris could accumulate Hg in the form of potentially bioavailable and non-bioavailable speciation in the sediment,which were relatively more stable.关键词
红树林/沉积物/汞积累/形态分析/连续提取Key words
mangrove/sediments/mercury accumulation/speciation/sequential extraction分类
资源环境引用本文复制引用
贺蓓,李瑞利,柴民伟,邱国玉,沈小雪..深圳湾红树林沉积物-植物体系汞的分布规律和形态分配特征[J].生态环境学报,2015,(3):469-475,7.基金项目
国家自然科学基金重大研究计划培育项目（91025008）；中国博士后基金特别资助（201104025）；深圳市科技计划基础研究项目 （）
