CO - Center of Oceanography, Faculty of Sciences, University of Lisbon, Campo Grande, 1749-016 Lisbon, Portugal.
Mar Pollut Bull. 2011 Jul;62(7):1584-7. doi: 10.1016/j.marpolbul.2011.04.025. Epub 2011 May 17.
Due to increasing global population, salt marshes have been subjected to multiple stressors such as increasing nutrient loadings and historical contamination. In order to better understand how does the salt marsh plants auto-remediation capacity (phytoaccumulation of metals) is affected by cultural eutrophication, an experiment was performed under controlled conditions. Plants were exposure to equal metal concentrations (Zn, Cu, and Ni - micronutrients, and Cd - class B metal) simulating historical contamination and three different concentrations of nitrogen (nitrate) simulating steps of cultural eutrophication. According to our study, under the tested concentrations, cultural eutrophication does not seem to affect Zn, Cu and Ni phytoremediation of H. portulacoides, but the ecosystem service of Cd phytoremediation seems to be promoted. Nevertheless, Cd high toxicity and bioaccumulation should be taken into account, as well as the vulnerability of salt marsh ecosystems, whose reduction will have drastic consequences to the ecosystem health.
由于全球人口不断增加，盐沼受到了多种压力，如营养负荷增加和历史污染。为了更好地了解盐沼植物的自动修复能力（金属的植物积累）如何受到富营养化的影响，在控制条件下进行了一项实验。实验中，植物暴露于模拟历史污染的相同金属浓度（Zn、Cu 和 Ni-微量元素和 Cd- B 类金属）和模拟富营养化不同阶段的三种不同浓度的氮（硝酸盐）下。根据我们的研究，在测试的浓度下，富营养化似乎不会影响 H. portulacoides 对 Zn、Cu 和 Ni 的植物修复，但似乎促进了 Cd 的植物修复的生态系统服务。然而，应该考虑 Cd 的高毒性和生物累积性，以及盐沼生态系统的脆弱性，其减少将对生态系统健康产生重大影响。
