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| Coupling effect of water management and fertilizers in remediation of Cd-contaminated soil using sepiolite |
| Received:January 07, 2019 |
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| KeyWord:sepiolite;water management;wormcast organic fertilizer;pak choi;cadmium |
| Author Name | Affiliation | E-mail | | LIU Yi-yun | Innovation Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Environmental Quality, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XU Ying-ming | Innovation Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Environmental Quality, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | ymxu1999@126.com | | HUANG Qing-qing | Innovation Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Environmental Quality, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | QIN Xu | Innovation Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Environmental Quality, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Li-jie | Innovation Team of Remediation for Heavy Metal Contaminated Farmland, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Environmental Quality, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| In order to investigate the coupling effect of water management and fertilizers on the effectiveness of sepiolite in the remediation of Cd-contaminated soil, a pot experiment was conducted with pak choi as the tested plant. The effects of wormcast with different application ratios on available Cd contents in soils, and Cd contents in roots and shoots of pak choi were studied under two different water conditions. The results indicated that sepiolite reduced the available Cd contents in soils significantly when the soil moisture contents were 60%~65%. Furthermore, the available Cd contents in soils with the addition of wormcast in sepiolite-amended soils were 2.24~2.72 times to single sepiolite-amended treatment, though the Cd contents in edible parts of pak choi did not change significantly (P<0.05). When soil moisture content was 100%, the available Cd contents in sepiolite-amended soils after the addition of 0.5%,1.0% and 2.0% wormcast, 1.0%, and 2.0% were increased by 1.11, 1.17, and 1.26 times, respectively. The application of 0.5% and 2.0% wormcast decreased the Cd contents in edible parts of pak choi by 55.9% and 56.8%, respectively, compared with the application of sepiolite alone. As a consequence, the coupling effect of water management and fertilizer has little impact on the remediation effectiveness of sepiolite with respect to Cd accumulation in plants when soil moisture contents maintained at 60%~65%. When the soil moisture content was 100% and the application ratio of wormcast was 0.5% or 2.0%, the coupling effect of water management and fertilizer could enhance the immobilization effect of sepiolite and further reduce Cd accumulation in pak choi. |
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