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| Research on the enhanced remediation of copper-contaminated soil by Leersia hexandra Swartz with nanoscale zero-valent iron |
| Received:August 22, 2024 |
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| KeyWord:phytoremediation;nano scale zero-valent iron;Leersia hexandra Swartz;copper pollution;antioxidant enzyme |
| Author Name | Affiliation | E-mail | | DONG Zihan | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China | | | ZHANG Xuehong | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China | | | DING Na | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China | | | SHU Yi | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China | | | LAI Caixing | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China | | | WANG Anqi | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China | | | LIU Jie | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China | | | YU Guo | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541006, China
Center for Water and Ecology, School of Environment, Tsinghua University, Beijing 100084, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
Guangxi Engineering Research Center of Comprehensive Treatment for Agricultural Non-Point Source Pollution, Guilin University of Technology, Guilin 541006, China | yuguo@glut.edu.cn |
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| Abstract: |
| This study aims to investigate the impact of nanoscale zero-valent iron（nZVI）on the copper（Cu）accumulation capacity, growth indicators, and antioxidant enzyme activity of Leersia hexandra Swartz, in Cu-contaminated soils. A pot experiment was conducted using an orthogonal design to study the effects of different concentrations of nZVI（0, 100, 500 mg·kg-1, and 1 000 mg·kg-1）on L. hexandra. grown in soils with two levels of Cu contamination（100 mg·kg-1and 500 mg·kg-1）. The findings reveal that as the concentration of nZVI applied increases, there is an initial rise followed by a subsequent decline in various index for L. hexandra., including Cu accumulation, bioconcentration factor（BCF）, translocation factor（TF）, biomass, chlorophyll content, and the level of the antioxidant system. This is primarily due to the fact that excessive concentrations of nZVI can trigger oxidative stress, thereby inhibiting the plant ′ s antioxidant defense mechanisms. However, the appropriate application of nZVI can enhance the Cu accumulation capacity of L. hexandra. In slightly polluted（100 mg·kg-1 Cu）soil, the application of 500 mg·kg-1 nZVI increased the biomass of L. hexandra. by 46%, the aboveground Cu accumulation by 115%, BCF and TF by 37% and 30%, and the activities of superoxide dismutase（SOD）and peroxidase（POD）by 18% and 10%. In contrast, in heavily polluted（500 mg·kg-1 Cu）soil, the application of 100 mg·kg-1 nZVI enhanced the biomass by 32%, the aboveground Cu accumulation by 61%, BCF and TF by 25% and 5%, and the activities of SOD and POD by 31% and 17%（P<0.05）. The study suggests that applying an appropriate amount of nZVI can enhance both biomass and chlorophyll content in L. hexandra. Additionally, it improves the plant′s tolerance to and absorption capacity for Cu by increasing the activity of its antioxidant enzymes. |
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