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| Effects of intercropping on Cd, Pb, and Zn accumulation using hyperaccumulators and energy plants |
| Received:December 09, 2020 |
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| KeyWord:intercropping;phytoremediation;Solanum photeinocarpum;Pterocypsela indica;energy plants;heavy metals |
| Author Name | Affiliation | E-mail | | ZHANG Xingfeng | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | WU Ping | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | FENG Jianfei | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | GUO Yuehong | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | GAO Bo | College of Plant and Ecological Engineering, Guilin University of Technology, Guilin 541004, China
College of Tourism & Landscape Architecture, Guilin University of Technology, Guilin 541004, China | gaobo@glut.edu.cn |
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| Abstract: |
| Intercropping is an important measure for phytoremediation coupled with agro-production. In this study, hyperaccumulators （Solanum photeinocarpum and Pterocypsela indica）and energy plants（Pennisetum americanum×P. thyphoideum and Sorghum bicolor） were mutually intercropped in pots to study the effects of intercropping on the co-remediation of Cd-, Pb-, and Zn-contaminated soil. The results showed that intercropping had no significant effect on soil organic matter; however, it did increase the content of available Cd, Pb, and Zn. Compared to the respective monoculture, the dry weights of Sol. photeinocarpum and Pt. indica were significantly increased under intercropping; however, the biomasses of the two energy plants were significantly decreased. Sol. photeinocarpum intercropped with the Pe.americanum×P. thyphoideum treatment significantly increased the Cd and Zn content in the shoots of Pe. americanum×P. thyphoideum. Pt. indica intercropped with Pe. americanum×P. thyphoideum treatment significantly increased the Cd and Zn content in the shoots of the two plants. The accumulation of Cd and Zn in the shoots of the two plants was significantly increased by P. indica intercropped with Pe. americanum×P. thyphoideum. In a single pot, the maximum values of Cd and Zn accumulation were produced by Pt. indica intercropped with Pe. americanum×P. thyphoideum（397.65 μg·pot-1 for Cd and 4 169.42 μg·pot-1 for Zn）, followed by Sol. photeinocarpum intercropped with Pe. americanum×P. thyphoideum. Pb accumulation was the highest in Sol. photeinocarpum intercropped with Pe. americanum×Pe. thyphoideum（158.28 μg·pot-1 for Pb）. Pb accumulation in the intercropping of Pt. indica and Pe. americanum×P. thyphoideum was 98.17 μg·pot-1. Therefore, Pt. indica intercropped with Pe. americanum×P. thyphoideum and Sol. photeinocarpum intercropped with Pe. americanum×Pe. thyphoideum can improve the phytoremediation efficiency of Cd-, Pb-, and Zn-contaminated soils. |
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