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| Effects of Water Management on Cadmium Stability and Nitrogen and Phosphorus Availability in Cadmium Polluted Red Soil After Immobilization Remediation |
| Received:June 17, 2015 |
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| KeyWord:water management;biochar;chicken manure;immobilization remediation;cadmium;polluted soil |
| Author Name | Affiliation | E-mail | | SUN Guo-hong | College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300384, China | | | LI Jian-rui | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | | | XU Ying-ming | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | ymxu1999@126.com | | QIN Xu | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | | | LIANG Xue-feng | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | | | SUN Yue-bing | Innovative Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute of Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Original Environmental Quality of Ministry of Agriculture, Tianjin 300191, China | | | YANG Lei | College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300384, China | | | DONG Jin-feng | College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300384, China | |
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| Abstract: |
| Immobilization is a low cost technique of remediating heavy metal-polluted soils. However, the efficiency of this technique is greatly influenced by soil water, oxidation-reduction and pH. Here a two-year pot experiment was conducted to investigate the impact of different water management(continuous flooding, wet-dry cycling and moist irrigation) on immobilization stability and nitrogen and phosphorus availability of cadmium polluted red soil after immobilization remediation with biochar and chicken manure. Compared with wet-dry cycling irrigation, continuous flooding and moist irrigation inhibited the aboveground biomass of rice in non-remediated soils during two year period. In remediated soils, however, the yields of rice grains in the second year were 2.7%~5.1% higher than those of the first year. Remediation significantly decreased exchangeable Cd content under continuous flooding, wet-dry cycling and moist irrigation, but there was no statistical difference in soil Cd availability between two years(P>0.05). Immobilization resulted in 34.5%~44.4% and 31.7%~45.0% reduction in Cd concentrations in brown rice, and 33.6% and 25.1% decrease in root Cd, for the first and second year, respectively. The content of Fe(Ⅱ) on rice root surface under remediation treatments increased by 27.3%, 59.1% and 65.0%, respectively, in continuous flooding, wet-dry cycling and moist irrigation, as compared with non-remediated soils. Correlation analysis revealed a significant negative linear relationship between Fe(Ⅱ) and Cd contents in the root coating of rice(r=0.61). There was a positive relationship between Cd content in brown rice and root coating(r=0.56), but there was a negative relationship between Cd concentration in brown rice and Fe(Ⅱ) in root coating(r=0.51). No significant changes in the content of soil available nitrogen and phosphorus were found in two-year experiment. |
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