Accumulation and biological cycling of heavy metal in four salt marsh species, from Tagus estuary (Portugal)

被引:146
作者
Duarte, B. [1 ]
Caetano, M. [3 ]
Almeida, P. R. [1 ,2 ]
Vale, C. [3 ]
Cacador, I. [1 ]
机构
[1] Ctr Oceanog, Inst Oceanog, P-17491016 Lisbon, Portugal
[2] Univ Evora, Dept Biol, P-7004516 Evora, Portugal
[3] Inst Nacl Recursos Biol, IPIMAR, P-1449006 Lisbon, Portugal
关键词
Metal cycling; Salt marshes; Root; Turnover periods; EXTRACELLULAR ENZYMATIC-ACTIVITY; SPARTINA-MARITIMA; HALIMIONE-PORTULACOIDES; BELOWGROUND BIOMASS; SEASONAL-VARIATION; ORGANIC-MATTER; TRACE-METALS; DECOMPOSITION; ALTERNIFLORA; SPECIATION;
D O I
10.1016/j.envpol.2009.12.004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Pools of Zn, Cu, Cd and Co in leaf, stem and root tissues of Sarcocornia fruticosa, Sarcocornia perennis, Halimione portulacoides and Spartina maritima were analyzed on a bimonthly basis, in a Tagus estuary salt marsh. All the major concentrations were found in the root tissues, being the concentrations in the aboveground organs neglectable for sediment budget proposes, as seen by the low root-aboveground translocation. Metal annual accumulation, root turnovers and cycling coefficients were also assessed. S. maritima showed the higher root turnovers and cycling coefficients for most of the analyzed metals, making this a phytostabilizer specie. By contrast the low root turnover, cycling coefficient and low root necromass generation makes S. perennis the most suitable specie for phytoremediation processes. Although the high amounts of metal return to the sediments, due to root senescence, salt marshes can still be considered sinks of heavy metals, cycling heavy metals mostly between sediment and root. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1661 / 1668
页数:8
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