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| Phytoremediation efficiency of cadmium-contaminated arable land by planted Sedum plumbizincicola with sulfur fertilization |
| Received:August 21, 2021 Revised:January 17, 2022 |
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| KeyWord:hole application;sulfur fertilizer;Sedum plumbizincicola;neutral Cd polluted farmland |
| Author Name | Affiliation | E-mail | | WU Jialing | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | CHEN Zhe | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Li River Basin, College of Life Sciences, Guangxi Normal University, Guilin 541006, China | ldchenzhe@qq.com | | YOU Shaohong | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | LI Maolin | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | ZHOU Hongyan | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | LI Kanqi | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | HUANG Xiaoman | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | |
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| Abstract: |
| This study sought to explore the effect of sulfur powder and ferrous sulfate fertilizer on the restoration of neutral Cdcontaminated soil by Sedum plumbizincicola. The optimal application rate of different sulfur fertilizers was selected to improve the phytoextraction efficiency of Cd. On the farmland with a total soil Cd content of 0.65 mg·kg-1 in Sidi Village, Xingping Town, Yangshuo County, using the field test method, 7 treatments including low, medium, and high doses of sulfur powder and ferrous sulfate were designed. The soil pH, total soil Cd content, and available Cd content were tested, and S. plumbizincicola biomass and Cd content were determined. The results showed that, compared to CK, the hole application of S fertilizers for 60 d effectively reduced soil pH and increased soil available Cd content, and effectively increased the shoot biomass and Cd content of S. plumbizincicola. The comparison of treatment effect and cost showed that hole application of 79 kg sulfur powder or 252 kg ferrous sulfate per hectare had optimal phytoextraction rates. Compared with CK, the above-mentioned treatments reduced the soil pH by 0.94 and 0.67, and increased soil available Cd content by 111.5% and 169.5%, respectively. The shoot biomass of S. plumbizincicola increased by 11.9% and 40.7%, the shoot Cd content increased by 48.5% and 132.1%, and the shoot Cd extraction increased by 65.8% and 226.3%, respectively. Therefore, there are potential enhanced phytoextraction agents for S. plumbizincicola to remediate neutral Cd-contaminated soil. Among them, the repair efficiency of ferrous sulfate treatment is significantly higher than that of sulfur powder treatment. |
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