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| Evaluation on effect of strengthening agronomic measures in cadmium-contaminated paddy field |
| Received:June 02, 2018 |
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| KeyWord:farmland;soil;brown rice;heavy metal;Cd;regulation |
| Author Name | Affiliation | E-mail | | XUE Tao | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | LIAO Xiao-yong | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | liaoxy@igsnrr.ac.cn | | WANG Ling-qing | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | ZHANG Yang-zhu | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | zhangyangzhu2006@163.com |
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| Abstract: |
| In order to alleviate the heavy metal pollution in paddy field and explore appropriate measures for the treatment of heavy metal pollution, the mixed soils and rice samples with representative regional blocks before and after treatment were collected in June and October 2017 for analysis, and were analyzed using methods such as the ecological hazard index method. And evaluate the status of heavy metal pollution in farmland in Hunan, and use the method of zoning to evaluate the effect of restoration. The results showed that farmland soil contains Cd, As and Hg combined pollution, especially Cd is the most serious. With an average content of 1.0 mg·kg-1, the potential ecological risk factors of level Ⅳ(very strong) and level Ⅴ(extremely strong) accounted for 98.51%. There is a high potential ecological risk. There is only Cd pollution in brown rice, and the average content is up to 0.81 mg·kg-1, with exceeding standard rate of 85.07%. In view of the pollution status in the study area, this article adopted the methods of joint substitution, soil passivation and various agronomic measures to control heavy metal pollution. After one season of late rice regulation and control, reduction rate of Cd in brown rice in light, medium, and heavy pollution areas were 34.58%, 30.03%, and 24.16%, respectively. The effect of decreasing Cd was obvious. At the same time, the restoration materials used in this study are safe, cheap and accessible, and the implementation process is in line with the local rice cultivation and farmland management habits. Therefore, this measure can be used for the prevention and control of large-scale light-to-moderate Cd-contaminated paddy fields. |
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