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| Potential of plant rotation patterns for phytoremediation of cadmium contaminated farmland |
| Received:August 30, 2021 |
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| KeyWord:cadmium;Sedum plumbizincicola;accumulation;plant rotation;phytoremediation potential |
| Author Name | Affiliation | E-mail | | CAO Xueying | Rural Vitalization Research Institute, Changsha University, Changsha 410022, China | | | TAN Changyin | School of Geographic Sciences, Hunan Normal University, Changsha 410081, China | chytan@hunnu.edu.cn | | CAI Runzhong | School of Geographic Sciences, Hunan Normal University, Changsha 410081, China | | | CHENG Xueyu | School of Geographic Sciences, Hunan Normal University, Changsha 410081, China | | | LIU Lulu | School of Geographic Sciences, Hunan Normal University, Changsha 410081, China | | | ZHANG Xuewen | Rural Vitalization Research Institute, Changsha University, Changsha 410022, China | | | HUANG Shuopei | School of Geographic Sciences, Hunan Normal University, Changsha 410081, China | |
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| Abstract: |
| The accumulation of Cd in different plants and the potential of plants for phytoremediation of Cd-contaminated farmland soil were examined to screen for suitable phytoremediation models for moderate and mild Cd-contaminated farmland soil. We examined rice, oilseed rape, oil sunflower, and Sedum plumbizincicola with different Cd absorption characteristics for combined crop rotation by studying variations in the soil Cd availability, Cd content in different plant parts, enrichment factor, Cd accumulation, and Cd removal owing to the plant rotation pattern. The enrichment factor of Cd in different plant parts, except in S. plumbizincicola , and accumulation of Cd aboveground were 13.81~81.34 g · hm-2 and 21.54~74.12 g · hm-2 for different plant rotation patterns, respectively. Cd removal owing to different plant rotation patterns was in the order of SPOS（rotation of S. plumbizincicola . and Cd high accumulation variety of late rice）> SPHA（rotation of S. plumbizincicola . and Cd high accumulation variety of oil sunflower）>CKOS（rotation of local main cultivar of early rice and Cd high accumulation variety of late rice）>CK（rotation of local main cultivar of early rice and local main cultivar of late rice）>HNOS （rotation of Cd high accumulation variety of oilseed rape and Cd high accumulation variety of late rice）, and the maximum amount of Cd removed was 150.34 g·hm-2. After harvest of the first crop, the Cd content and available Cd content of the soil decreased by 15.66% and 37.14%, respectively, for S. plumbizincicola . However, after the second crop was harvested, the available Cd content in the soil increased by more than 95.51%, which was conducive for the absorption and phytoremediation in the next year. Among all treatments, the amount of Cd accumulated aboveground was the lowest in oilseed rape, but the available Cd content was increased by 20.00% compared with that before the experiment; the growth period of oilseed rape was similar to that of S. plumbizincicola . In conclusion, the rotation of S. plumbizincicola and Cd high accumulation variety of late rice and Cd high accumulation variety of oilseed rape intercropping with S. plumbizincicola show potential for phytoremediation of moderate and mild Cd-contaminated farmland soil and can be used as planting modes for phytoremediation of Cd-contaminated farmland in central Hunan. |
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