欢迎访问《中国农学通报》，
中国农学通报

中国农学通报 ›› 2019, Vol. 35 ›› Issue (35): 94-99.doi: 10.11924/j.issn.1000-6850.casb18080071

所属专题： 土壤重金属污染； 水稻

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

湖南典型酸性镉污染稻田全过程管控技术案例研究

刘艳,李慧,晏洪铃,蔡亮亮,刘朝辉,欧阳赛   

  1. 湖南现代环境科技股份有限公司
  • 收稿日期:2018-08-16 修回日期:2018-10-22 接受日期:2018-10-25 出版日期:2019-12-16 发布日期:2019-12-16
  • 通讯作者: 刘艳
  • 基金资助:
    环保公益性行业科研专项“耕地土壤风险管控模式与成效评估方法研究”(201509032)

Whole-process Control Technology of Typical Rice Field Polluted with Cadmium in Hunan: A Case Study

  • Received:2018-08-16 Revised:2018-10-22 Accepted:2018-10-25 Online:2019-12-16 Published:2019-12-16

PDF (PC)

108

摘要： 长沙县试验稻田属于南方典型的酸性镉污染稻田，水稻对土壤中镉的富集程度较高[1]，镉大米的生产将对食品安全和人类健康产生风险。本文对选取的镉污染稻田其进行了污染特征分析及污染风险评价，然后根据分析评价结果采用全过程管控模式（前端灌溉水净化，中端稳定化控制，末端植物富集）开展了修复治理研究。结果表明：该试验稻田案例地属于高风险，采用全过程管控模式后，稻米镉下降67.24%；土壤有效态镉下降38.10%，水稻增产8.85%。土壤总镉的去除率达3.17%~8.45%，油菜植株对土壤总镉的富集系数为2.69~3.43。通过估算，本案例地直接治理成本为每季5100元/hm2。本研究对污染稻田修复建立起一套完整的全过程管控集成技术并进行推广及示范有重要意义。

关键词: 氮用量, 氮用量, 海南茄衣, 中性致香物质

Abstract: The tested rice field in the Changsha County is an typical acidic Cd-polluted paddy field , and the rice has a high accumulation of Cd from the soil[1]. The production of cadmium rice will bring a risk to food safety and human health. In this paper, the characteristic of the selected Cd-polluted paddy field was analyzed and the risk of pollution was evaluated. Then, according to the analysis and evaluation results, the restoration and treatment research was carried out, which used the whole-process control mode (front-end irrigation water purification, middle-end stabilization control, and end-end plant enrichment). The results showed that the experimental rice field was a high-risk field, and the Cd in rice decreased by 67.24% after the application of whole-process control mode. Available Cd of soil decreased by 38.10% and the yield of rice increased by 8.85%.The removal rate of total Cd was 3.17%~8.45% in soil, and the bio-concentration factor (BCF) of Cd in the rape plant was 2.69~3.43. By estimation, the direct remediation cost of this case is 5100 yuan /hm2 per quarter. This study is of great significance for the establishment of a complete set of whole-process control integration technology for the remediation of contaminated rice fields and its promotion and demonstration.

中图分类号: