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Root-Induced Changes of pH, Eh, Fe(II) and Fractions of Pb and Zn in Rhizosphere Soils of Four Wetland Plants with Different Radial Oxygen Losses

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文献类型：外文期刊

作者： Yang Jun-Xing ¹ ; Liu Yong ³ ; Ye Zhi-Hong ¹ ;

作者机构： 1.Sun Yat Sen Univ, State Key Lab Biocontrol, Sch Life Sci, Guangzhou 510006, Guangdong, Peoples R China

2.Sun Yat Sen Univ, Guangdong Key Lab Plant Resources, Sch Life Sci, Guangzhou 510006, Guangdong, Peoples R China

3.Chinese Acad Fishery Sci, S China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Lab Environm Remediat, Beijing 100101, Peoples R China

关键词： heavy metal;iron oxidation;mobility factor;plaque;rhizobox

期刊名称：PEDOSPHERE （影响因子：3.911；五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2012 年 22 卷 4 期

页码：

收录情况： SCI

摘要： A rhizobox experiment was conducted to compare iron (Fe) oxidation and changes of pH, redox potential (Eh) and fractions of zinc (Zn) and lead (Pb) in rhizosphere and non-rhizosphere soils of four emergent-rooted wetland plants (Echinodorus macrophyllus, Eleocharis geniculata, Hydrocotyle vulgaris and Veronica serpyllifolia) with different radial oxygen loss (ROL) from roots. The results indicated that all these wetland plants decreased pH and concentration of Fe(II) but increased the Eh in the rhizosphere soils. Pb and Zn were transformed from unstable fractions to more stable fractions in the rhizosphere soils, so decreasing their potential metal mobility factors (MF). Among the four plants, E. macrophyllus, with the highest ROL and root biomass, possessed the greatest ability in formation of Fe plaque and in the reduction of heavy metal MFs in the rhizosphere soil. Wetland plants, with higher ROLs and root biomass, may thus be effective in decreasing potential long-term heavy metal bioavailabilities.

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