Contributions of Wetland Plants on Metal Accumulation in Sediment

被引:4
作者
Nel, Marele A. [1 ,2 ]
Rubidge, Gletwyn [3 ]
Adams, Janine B. [1 ]
Human, Lucienne R. D. [1 ,2 ]
机构
[1] Nelson Mandela Univ, DSI NRF Res Shallow Water Ecosyst, Dept Bot, South Campus, ZA-6031 Port Elizabeth, South Africa
[2] Nelson Mandela Univ, South African Environm Observat Network SAEON Elw, Ocean Sci Campus,4 Gomery Ave, ZA-6031 Port Elizabeth, South Africa
[3] Nelson Mandela Univ, Dept Chem, Summerstrand North Campus, ZA-6031 Port Elizabeth, South Africa
基金
新加坡国家研究基金会; 芬兰科学院;
关键词
metal pollution; Swartkops Estuary; TXRF; salt marsh; seagrass; wetland plants; SEA-LEVEL RISE; HEAVY-METALS; SWARTKOPS ESTUARY; HALIMIONE-PORTULACOIDES; HALOPHYTE VEGETATION; OXYGEN DYNAMICS; SIZE FRACTIONS; SALT MARSHES; SPECIATION; RIVER;
D O I
10.3390/su14063679
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Wetlands, and especially salt marshes, are well-known sinks of metals, which limit toxic amounts of metals from entering the food chain. This study investigated metal concentrations (Cr, Cu, Fe, Mn, Ni, Pb, Zn) in a highly urbanised estuary, and compared vegetated rhizosediment (Salicornia tegetaria, Spartina maritima, and Zostera capensis) with bare sediment, in a depositional and non-depositional site, in the intertidal zone of the Swartkops Estuary. The samples were collected at two sites along the middle and lower reaches of the estuary and analysed using a Total X-ray Fluorescence (TXRF) spectrometer. It was found that the rhizosediment contained more metals and that metal concentrations in the sediment decreased as follows: S. tegetaria > S. maritima > Z. capensis > bare sediment. Although metal accumulation was similar in bare sediment for the depositional (Site B) and the non-depositional site (Site A), the rhizosediment displayed higher metal accumulation in the depositional site (Site B). However, regardless of site-specific depositional tendencies, rhizosediment displayed higher metal accumulation than bare sediment. These results indicate that vegetated sites and vegetated depositional sites should be the focus of monitoring metals in estuaries around the world.
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页数:14
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