Caçador Isabel, Caetano Miguel, Duarte Bernardo, Vale Carlos
Institute of Oceanography, Faculty of Sciences, University of Lisbon, Rua Ernesto de Vasconcelos, Campo Grande 1749-016 Lisbon, Portugal.
Mar Environ Res. 2009 Mar;67(2):75-82. doi: 10.1016/j.marenvres.2008.11.004. Epub 2008 Nov 25.
Pools of Zn, Cu, Cd and Co in the leaf, stem and root tissues of Sarcocornia fruticosa, Sarcocornia perennis, Halimione portulacoides and Spartina maritima were analysed for a Tagus estuary (Portugal) salt marsh. Pools of Cu and Cd in the salt marsh were higher in spring/summer, indicating a net uptake of these metals during the growing season. Standing stocks of Zn, Cu, Cd and Co in the leaf and stem biomass of S. fruticosa, S. perennis and H. portulacoides showed a strong seasonal variation, with higher values recorded in autumn. The metal-containing leaves and stems that shed in the autumn become metal-containing detritus. The amount of this material washed out from the total marsh area (200 ha) was estimated as 68 kg of Zn, 8.2 kg of Cu, 13 kg of Co and 0.35 kg of Cd. The high tidal amplitude, a branched system of channels and semi-diurnal tidal cycle greatly favour the export of the organic detritus to adjoining marsh areas.
对葡萄牙塔霍河河口盐沼中的多枝盐角草、多年生盐角草、海滨碱蓬和滨海 Spartina maritima 的叶、茎和根组织中的锌、铜、镉和钴库进行了分析。盐沼中铜和镉的库在春季/夏季较高，表明在生长季节这些金属有净吸收。多枝盐角草、多年生盐角草和海滨碱蓬叶和茎生物量中锌、铜、镉和钴的现存储量呈现出强烈的季节性变化，秋季记录到的值更高。秋季脱落的含金属的叶和茎变成了含金属的碎屑。估计从整个盐沼区域（200 公顷）冲刷出的这种物质的量为 68 千克锌、8.2 千克铜、13 千克钴和 0.35 千克镉。高潮差、分支的河道系统和半日潮周期极大地促进了有机碎屑向毗邻盐沼区域的输出。
