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| Comparative repair test of different varieties of kenaf in heavily and lightly cadmium-contaminated farmland |
| Received:March 10, 2020 |
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| KeyWord:cadmium pollution;kenaf;phytoremediation;farmland;comparative test |
| Author Name | Affiliation | E-mail | | YIN Ming | Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences/Key Laboratory of Biological and Processing for Bast Fiber Crops of Ministry of Agriculture and Rural, Changsha 410205, China | | | TANG Hui-juan | Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences/Key Laboratory of Biological and Processing for Bast Fiber Crops of Ministry of Agriculture and Rural, Changsha 410205, China | | | YANG Da-wei | Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences/Key Laboratory of Biological and Processing for Bast Fiber Crops of Ministry of Agriculture and Rural, Changsha 410205, China | | | DENG Yong | Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences/Key Laboratory of Biological and Processing for Bast Fiber Crops of Ministry of Agriculture and Rural, Changsha 410205, China | | | LI De-fang | Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences/Key Laboratory of Biological and Processing for Bast Fiber Crops of Ministry of Agriculture and Rural, Changsha 410205, China | | | ZHAO Li-ning | Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences/Key Laboratory of Biological and Processing for Bast Fiber Crops of Ministry of Agriculture and Rural, Changsha 410205, China | | | HUANG Si-qi | Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences/Key Laboratory of Biological and Processing for Bast Fiber Crops of Ministry of Agriculture and Rural, Changsha 410205, China | siqihuang@caas.cn |
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| Abstract: |
| The aim of this study is to determine the repair ability of different varieties of kenaf in farmland containing different levels of cadmium(Cd)pollution. A phytoremediation experiment with seven types of kenaf in heavily and lightly Cd-contaminated farmland was undertaken to determine the Cd accumulation and enrichment, transfer coefficients, physiological signs of various parts of kenaf, and relevant soil changes. The source of the total variation in the experiment and the regression coefficient of each variety were calculated. The results showed that all kenaf grew well in Cd-contaminated farmland and Cd removal in kenaf in the heavily Cd-contaminated farmland was 72.49~149.17 g·hm-2 and in the lightly polluted farmland was 25.95~49.91 g·hm-2. The enrichment ability of Cd in different parts of kenaf was leaves > roots > stems and the transfer ability of Cd was leaves>stems. In heavily Cd-contaminated farmland, the Cd enrichment coefficients of kenaf ranged from 1.11 to 8.83 and the transfer coefficients ranged from 0.32 to 4.25. In the lightly Cd-contaminated farmland, the Cd enrichment coefficients of kenaf ranged from 2.08 to 14.63 and the transfer coefficients ranged from 0.38 to 2.92. The regression coefficients of the different varieties of kenaf were less than 1 and the stability was high. The study shows that all seven types of kenaf have good biological yield and Cd enrichment and transfer mechanism for restoring Cd-contaminated farmland. Among them, China kenaf No.13 is recommended for the restoration of heavily Cd-contaminated farmland, whereas China kenaf No.13 and China hybrid kenaf No.328 are recommended for the restoration of lightly Cd-contaminated farmland. |
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