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| Remediation potential of Trifolium repens used in cadmium-contaminated soils |
| Received:April 10, 2017 |
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| KeyWord:cadmium pollution;soil;remediation potential;Trifolium repens |
| Author Name | Affiliation | E-mail | | LIU Yong | School of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China
University of Chinese Academy of Science, Beijing 100049, China
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang 550002, China | | | LIU Yan | School of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China | gyly68@sina.com | | YANG Dan | School of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China | | | LIANG Qing | School of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China | | | LOU Jie | School of Biological and Environmental Engineering, Guiyang University, Guiyang 550005, China | |
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| Abstract: |
| In this study, the enrichment characteristics and purification capacity of Trifolium repens for cadmium in soil were investigated in order to provide a reference for ecological restoration of cadmium. The results showed that the added value of T. repens biomass reached 2.0~3.7 g, indicating that T. repens could have a high tolerance for cadmium. Cadmium accumulation in the roots, stems, and leaves of T. repens reached 178.6, 101.3 mg·kg-1, and 130.9 mg·kg-1, respectively, as the concentration of cadmium increased. The bioaccumulation factor values of the roots, stems, and leaves were 9.7~17.9, 3.0~10.1, and 3.1~13.1, respectively, and the ability of cadmium to accumulate in different parts of T. repens was decreased in the order of roots > leaves > stems. The translocation factor values for cadmium in T. repens were all greater than 1(except T2 treatment). These data indicated that T. repens could have a strong capacity for cadmium enrichment and could easily transport cadmium into the soil. The amount of cadmium uptake of T. repens increased diversely with the different cadmium treatments in soils; in particular, the cadmium uptake of the aboveground parts(stems and leaves) of T. repens reached 87.2%, and the purifying rate of cadmium in soils was as high as 6.2%. Based on these findings, T. repens was found to have promising applications in beautifying surroundings and repairing cadmium-contaminated soils. |
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