Centro de Oceanografia, Instituto de Oceanografia, Campo Grande, 1749-1016 Lisboa, Portugal.
Environ Pollut. 2010 May;158(5):1661-8. doi: 10.1016/j.envpol.2009.12.004. Epub 2009 Dec 28.
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.
在塔古斯河口盐沼中，我们每两个月分析一次滨藜、二色补血草、海蓬子和互花米草的叶、茎和根组织中的锌、铜、镉和钴。所有主要的浓度都存在于根组织中，由于地上器官中的浓度可忽略不计，因此不适合进行沉积物预算研究，从较低的根-地上部转运率就可以看出这一点。我们还评估了金属的年积累、根周转率和循环系数。对于大多数分析的金属，互花米草表现出较高的根周转率和循环系数，这使其成为一种植物稳定剂。相比之下，由于根衰老，二色补血草的低根周转率、循环系数和低根坏死物质生成使其成为植物修复过程中最适合的物种。尽管大量的金属因根衰老而返回沉积物中，但盐沼仍可以被认为是重金属的汇，重金属主要在沉积物和根之间循环。
