Journal
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
Volume 41, Issue 1, Pages 175-189Publisher
SPRINGER
DOI: 10.1007/s10653-018-0107-y
Keywords
Sonneratia apetala; Kandelia obovata; Sediment; Heavy metal; Pearl River Estuary
Categories
Funding
- Program of Science and Technology of Guangdong Province (Study on ecological investigation and protection patterns of typical coastal Mangroves in Guangdong Province)
- Program of Science and Technology of Shenzhen [JCYJ20160330095549229, KQJSCX20160226110414]
- Program of Assessment and Restoration of Mangrove Geiwei of Shenzhen Bay
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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.
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