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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Factors affecting metal concentrations in reed plants (Phragmites australis) of intertidal marshes in the Scheldt estuary
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Factors affecting metal concentrations in reed plants (Phragmites australis) of intertidal marshes in the Scheldt estuary

机译：Scheldt河口潮间带湿地芦苇植物（芦苇）中金属浓度的影响因素

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摘要

We aimed to identify the environmental factors which significantly affect metal uptake by reed plants in the intertidal marshes along the river Scheldt. Transfer coefficients, defined as the ratio of metal concentrations in reed stems to the metal contents in specific sediment fractions (i.e. the exchangeable Cd and Zn fraction and total Cr, Cu, Ni and Pb content), were calculated for each sampling site. They were inversely related to the sediment clay and/or organic matter content. Metal mobility and thus plant availability is higher in sediments with a lower clay or organic matter content. Moreover, the plants might actively accumulate in particular essential elements when concentrations in the sediments are rather low, which is the case in sediments low in clay and organic matter contents. Finally, more sandy sediments are expected to be susceptible to occasional oxidation of sulphides, which leads to an increased metal availability. A higher salinity promoted the uptake of Cu, Cr and Zn.
机译：我们旨在确定环境因素，这些环境因素在沿Scheldt河的潮间带沼泽中严重影响芦苇植物对金属的吸收。计算每个采样点的传递系数，该系数定义为芦苇茎中金属浓度与特定沉积物分数（即可交换的Cd和Zn分数以及总Cr，Cu，Ni和Pb含量）中金属含量的比率。它们与沉积物粘土和/或有机物含量成反比。粘土或有机物含量较低的沉积物中的金属迁移率较高，因此植物的利用率较高。此外，当沉积物中的浓度相当低时，植物可能会积极地积累特定的必需元素，而粘土和有机物含量低的沉积物就是这种情况。最后，预计更多的沙质沉积物会不时发生硫化物的氧化，从而增加金属的利用率。较高的盐度促进了对铜，铬和锌的吸收。

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