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| Immobilization of Cadmium in a Paddy Soil Using Moisture Management and Amendments |
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| KeyWord:continuous flooding; conventional irrigation; paddy soil; Cd; immobilization remediation |
| Author Name | Affiliation | | LI Jian-rui | Department of Pollution Control, Ago-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Innovative Team of Heavy Metal Contaminated Farmland of Chinese Academy of Agricultural Sciences, Tianjin 300191, China | | XU Ying-ming | Department of Pollution Control, Ago-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Innovative Team of Heavy Metal Contaminated Farmland of Chinese Academy of Agricultural Sciences, Tianjin 300191, China | | LIN Da-song | Department of Pollution Control, Ago-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Innovative Team of Heavy Metal Contaminated Farmland of Chinese Academy of Agricultural Sciences, Tianjin 300191, China | | LIANG Xue-feng | Department of Pollution Control, Ago-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Innovative Team of Heavy Metal Contaminated Farmland of Chinese Academy of Agricultural Sciences, Tianjin 300191, China | | SUN Guo-hong | College of Technology, Tianjin Agricultural University, Tianjin 300384, China | | SUN Yue-bing | Department of Pollution Control, Ago-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Innovative Team of Heavy Metal Contaminated Farmland of Chinese Academy of Agricultural Sciences, Tianjin 300191, China |
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| Abstract: |
| In situ immobilization is one of remediation techniques for soil heavy metals. Here a pot experiment was conducted to study the effects and mechanisms of moisture management and amendments in Cd immobilization in a paddy soil. At 0.75 mg Cd·kg-1, application of sepiolite combined with phosphate fertilizer significantly increased soil pH and reduced exchangeable Cd by 20.4% and 15.7%, carbonate bound Cd by 15.5% and 14.1%, and brown rice Cd by 52.3% and 46.0%, under continuous flooding and conventional irrigation, respectively, compared to the control. Under no amendments, the content of Fe（Ⅱ） in the root coating was 1.2 times higher in continuous flooding than in conventional irrigation, but Cd content in the root coating in the continuous flooding treatment was only 82.6% of that in the conventional irrigation treatment. Applying amendments increased Fe（Ⅱ） content in the root coating by 40.1% and 70.0%, but reduced the Cd content in the root coating by 35.3% and 42.4% under continuous flooding and conventional irrigation, respectively. Cadmium in brown rice was significantly negatively correlated with Fe（Ⅱ） in root coating, but positively with Cd in the root coating. In conclusion, the competition for sorption sites in root coating between Fe2+ and Cd2+ and lower soil Cd bioavailability were main factors leading to lower Cd concentrations in brown rice for the amended soils. |
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