Heavy metal (Pb, Zn) uptake and chemical changes in rhizosphere soils of four wetland plants with different radial oxygen loss

文献类型： 外文期刊

第一作者： Yang, Junxing

作者： Yang, Junxing;Ma, Zuoluo;Ye, Zhihong;Yang, Junxing;Ma, Zuoluo;Ye, Zhihong;Yang, Junxing;Guo, Xueyan;Qiu, Rongliang

作者机构：

关键词： Lead;Zinc;Rhizosphere;Wetland plant;Radial oxygen loss

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

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收录情况： SCI

摘要： Lead and Zn uptake and chemical changes in rhizosphere soils of four emergent-rooted wetland plants; Aneilema bracteatum, Cyperus alternifolius, Ludwigia hyssopifolia and Veronica serpyllifolia were investigated by two experiments: (1) rhizobag filled with "clean" or metal-contaminated soil for analysis of Pb and Zn in plants and rhizosphere soils; and (2) applied deoxygenated solution for analyzing their rates of radial oxygen loss (ROL). The results showed that the wetland plants with different ROL rates had significant effects on the mobility and chemical forms of Pb and Zn in rhizosphere under flooded conditions. These effects were varied with different metal elements and metal concentrations in the soils. Lead mobility in rhizosphere of the four plants both in the "clean" and contaminated soils was decreased, while Zn mobility was increased in the rhizosphere of the "clean" soil, but decreased in the contaminated soil. Among the four plants, V. serpyllifolia, with the highest ROL, formed the highest degree of Fe plaque on the root surface, immobilized more Zn in Fe plaque, and has the highest effects on the changes of Zn form (EXC-Zn) in rhizosphere under both "clean" and contaminated soil conditions. These results suggested that ROL of wetland plants could play an important role in Fe plaque formation and mobility and chemical changes of metals in rhizosphere soil under flood conditions.

分类号： X21

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