Mobility of metals in salt marsh sediments colonised by <Emphasis Type="Italic">Spartina maritima</Emphasis> (Tagus estuary,Portugal) |
| |
Authors: | Rosa Reboreda Isabel Caçador Sílvia Pedro Pedro Raposo Almeida |
| |
Institution: | (1) Faculty of Sciences, Institute of Oceanography, University of Lisbon, Campo Grande, 1749-016 Lisbon, Portugal |
| |
Abstract: | Chemical associations of Zn, Pb, Cu, Co and Cd were determined using a sequential extraction procedure in sediments colonised
by S. maritima in three salt marshes within the Tagus estuary: Rosário, Corroios and Pancas. Concentrations of these metals were also analysed
in above- and belowground parts of Spartina maritima, as well as in sediments colonised by the plant. The highest metal concentrations in sediments were found in the marshes
near the industrial and urban areas, whereas metal concentrations in plants were not significantly different among sites.
This was thought to be a consequence of differences observed in metal bioavailability: Metals in Pancas, the least polluted
location, were largely associated to easily accessible fractions for plant uptake, probably as a result of low organic matter
content and high sandy fraction in sediments. S. maritima was able to induce the concentration of metals between its roots in the three salt marshes. The results obtained in this
study indicate that S. maritima could be useful to induce phytostabilisation of metals in sediments, although the effectiveness to modify chemical associations
is highly dependent on existing sediment parameters, and thus different results could be obtained depending on site characteristics.
Guest editors: J. Davenport, G. Burnell, T. Cross, M. Emmerson, R. McAllen, R. Ramsay & E. Rogan
Challenges to Marine Ecosystems |
| |
Keywords: | Bioavailability Metals Phytoimmobilisation Salt marsh Spartina maritima |
本文献已被 SpringerLink 等数据库收录! |
|