School of Environment and Energy, Shenzhen Graduate School of Peking University, Shenzhen, 518055, China.
Department of Biology and Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong, China.
Environ Geochem Health. 2019 Feb;41(1):175-189. doi: 10.1007/s10653-018-0107-y. Epub 2018 Jun 6.
The present study compared accumulation of heavy metals in a mangrove swamp dominated by Kandelia obovata with that by Sonneratia apetala in Pearl River Estuary, China. The results showed that the concentrations of heavy metals at all sediment depths in the S. apetala site were significantly higher than that in K. obovata. The geo-accumulation index and potential ecological risk index also showed that S. apetala sediment had a higher contamination of heavy metals, especially Cd. S. apetala significantly altered the biogeochemical cycles of Cd, lead (Pb), nickel (Ni) and chromium (Cr). In S. apetala sediment, TOC played an important role in sequestering heavy metals as reflected by its positive correlations with Zn and Pb. This study demonstrated the importance of plant species in altering soil quality and heavy metal accumulation, and S. apetala is more efficiently working as a pollution barrier than K. obovata.
本研究比较了中国珠江口以红海榄（Kandelia obovata）为主的红树林沼泽和白骨壤（Sonneratia apetala）为主的红树林沼泽中重金属的积累情况。结果表明，在白骨壤地点，所有沉积物深度的重金属浓度均明显高于红海榄。地质累积指数和潜在生态风险指数也表明，白骨壤沉积物受到了更高程度的重金属污染，尤其是 Cd。白骨壤显著改变了 Cd、铅（Pb）、镍（Ni）和铬（Cr）的生物地球化学循环。在白骨壤沉积物中，TOC 通过与 Zn 和 Pb 的正相关关系，在螯合重金属方面发挥了重要作用。本研究证明了植物物种在改变土壤质量和重金属积累方面的重要性，并且白骨壤比红海榄更有效地充当污染屏障。
