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| Comparative study on the potential of a kenaf(Hibiscus cannabinus)variety for remediating heavy metal contaminated soils |
| Received:March 22, 2018 |
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| KeyWord:kenaf;heavy metal;plant biomass;bioconcentration factor;transfer factor |
| Author Name | Affiliation | E-mail | | LI Wen-lüe | Cotton and Bast Fiber Crops Research Institute of Xiaoshan Zhejiang Province, Hangzhou 311202, China | | | JIN Guan-rong | Cotton and Bast Fiber Crops Research Institute of Xiaoshan Zhejiang Province, Hangzhou 311202, China | | | LUO Xia-hong | Cotton and Bast Fiber Crops Research Institute of Xiaoshan Zhejiang Province, Hangzhou 311202, China | | | AN Xia | Cotton and Bast Fiber Crops Research Institute of Xiaoshan Zhejiang Province, Hangzhou 311202, China | | | LI Ping-fang | Cotton and Bast Fiber Crops Research Institute of Xiaoshan Zhejiang Province, Hangzhou 311202, China | | | ZHU Guan-lin | Cotton and Bast Fiber Crops Research Institute of Xiaoshan Zhejiang Province, Hangzhou 311202, China | | | CHEN Chang-li | Cotton and Bast Fiber Crops Research Institute of Xiaoshan Zhejiang Province, Hangzhou 311202, China | chenchangli66@163.com |
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| Abstract: |
| Soil heavy metal pollution has been a focus of research, and phytoremediation is currently a commonly used strategy for heavy metal contaminated soil restoration. However, it usually takes many years for plants to remediate heavy metal-contaminated soil. Furthermore, most of the plants used for restoration have small biomass and low economic value. Therefore, scientists have considered large biomass plants for remediation of heavy metal contaminated soils. In this study, kenaf, which has high economic value and biomass, was used to study the potential for remediating heavy metal contaminated soils. Seven kenaf varieties were planted in soils, which were heavily polluted by zinc (Zn), copper (Cu), chromium (Cr), cadmium (Cd), and nickel (Ni). The yield of kenaf and heavy metal contents in leaves, stems, and roots were determined at the maturity stage of the fiber; furthermore, the bioconcentration factor, transfer factor, and heavy metal transfer amount were calculated. The results showed that the biomass of the hybrid combination Hongyou-2 ranked first in the last two years' experiments, and its biomass values were 10.1 t·hm-2 and 16.7 t·hm-2, respectively. There was a significant difference in the concentration of heavy metals in different organs of kenaf (P<0.05). The accumulation of heavy metals in leaves and roots was higher than that in stalks, but the bioconcentration factors were < 1; thus, they did not reach the values as high hyperaccumulating plants. The transfer factor of Xianghong-1 was higher than that of the other varieties, in which the transfer factor of Cd reached 1.39. Kenaf could transfer at most 185.3 g·hm-2 Cu (Fuhong-991), 1 012.9 g·hm-2 Zn (Xianghong-1), 25.7 g·hm-2 Cd (Zhe-8310), 40.8 g·hm-2 Cr (H368), and 34.8 g·hm-2 Ni (H368). In general, kenaf is a heavy metal tolerant plant with a large biomass, but its heavy metal absorption capacity is not exceptionally good. It could be used as a reclamation crop grown on heavy metal contaminated soils. |
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