| 薛涛,廖晓勇,王凌青,张扬珠.农艺强化措施治理稻田镉污染的效果评价[J].农业环境科学学报,2018,37(7):1537-1544. |
| 农艺强化措施治理稻田镉污染的效果评价 |
| Evaluation on effect of strengthening agronomic measures in cadmium-contaminated paddy field |
| 投稿时间：2018-06-02 |
| DOI：10.11654/jaes.2018-0729 |
| 中文关键词: 农田 土壤 糙米 重金属 Cd 调控 |
| 英文关键词: farmland soil brown rice heavy metal Cd regulation |
| 基金项目:公益性行业（农业）科研专项（201403015）；国家重点研发计划项目（2017YFD0800900） |
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| 摘要点击次数: 2061 |
| 全文下载次数: 2024 |
| 中文摘要: |
| 为了缓解农田重金属污染状况，探索适宜的重金属污染治理方法，于2017年6月和10月分别采集治理前后具有区域代表性田块的混合土壤和稻谷样品进行分析，利用生态危害指数法等方法分析和评价湖南某地农田重金属污染状况，并利用分区的方法对治理效果进行评价。结果显示，农田土壤存在Cd、As、Hg的复合污染，尤以Cd最为严重，平均含量达1.0 mg·kg-1，其潜在生态危害系数Ⅳ级（很强）和Ⅴ级（极强）占98.51%，存在很高的潜在生态风险，糙米中仅存在Cd污染，平均含量达0.81 mg·kg-1，超标率高达85.07%。针对研究区污染状况，采用品种替代、土壤钝化和多种农艺措施综合调控的手段进行重金属污染调控治理研究，经过一季晚稻调控治理后，发现轻、中、重三类污染区糙米降Cd率分别为34.58%、30.03%和24.16%，降Cd效果明显。同时，本研究所用材料安全、廉价、易得，且实施过程符合当地水稻种植和农田管理习惯，因此，这种综合的农艺强化措施可用于大规模轻、中度Cd污染农田的防治。 |
| 英文摘要: |
| 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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