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| Heavy metal （Pb,Zn） uptake and chemical changes in rhizosphere soils of four wetland plants with different radial oxygen loss | |
| 作者姓名： | Junxing Yang Zuoluo M Zhihong Ye Xueyan Guo Rongliang Qiu |
| 作者单位： | Junxing Yang(State Key Laboratory for Bio-control, and School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China;Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences, Beijing 100081, China);Zuoluo Ma,Zhihong Ye(State Key Laboratory for Bio-control, and School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China);Xueyan Guo(Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences, Beijing 100081, China);Rongliang Qiu(School of Environmental Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China) |
| 基金项目： | This work was supported by the National Natural Science Foundation of China (No. 30570345, 30770417), the Guangdong Natural Science Group Foundation (No. 06202438) and the Specialized Research Fund for the Doctoral Program of Higher Education, China (No. 20558097). |
| 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 di erent ROL rates had significant
e ects on the mobility and chemical forms of Pb and Zn in rhizosphere under flooded conditions. These e ects were varied with
di erent 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 e ects 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. |
| 关 键 词： | 植物根际土壤 重金属含量 湿地植物 化学变化 吸收 损失 径向 氧气 |
| 收稿时间： | 15 July 2009 |
| 修稿时间： | 6 October 2009 |
Heavy metal (Pb, Zn) uptake and chemical changes in rhizosphere soils of four wetland plants with di erent radial oxygen loss |
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| Junxing Yang,Zuoluo M,Zhihong Ye,Xueyan Guo,Rongliang Qiu.Heavy metal (Pb, Zn) uptake and chemical changes in rhizosphere soils of four wetland plants with di erent radial oxygen loss[J].Journal of Environmental Sciences,2010,22(5):696-702. | |
| Authors: | Junxing Yang Zuoluo M Zhihong Ye Xueyan Guo and Rongliang Qiu |
| Institution: | 1. State Key Laboratory for Bio-control, and School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China;Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences, Beijing 100081, China 2. State Key Laboratory for Bio-control, and School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, China 3. Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences, Beijing 100081, China 4. School of Environmental Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China |
| Abstract: | 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 rhizospbore soil under flood conditions. |
| Keywords: | lead zinc rhizosphere wetland plant radial oxygen loss |
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