| 杭嘉湖平原水稻主产区土壤重金属状况调查及风险评价 |
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| 引用本文： | 马佳燕,马嘉伟,柳丹,傅伟军,叶正钱.杭嘉湖平原水稻主产区土壤重金属状况调查及风险评价[J].浙江农林大学学报,2021,38(2):336-345. |
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| 作者姓名： | 马佳燕 马嘉伟 柳丹 傅伟军 叶正钱 |
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| 作者单位： | 1.浙江农林大学 省部共建亚热带森林培育国家重点实验室，浙江 杭州 3113002.浙江农林大学 浙江省土壤污染生物修复重点实验室，浙江 杭州 311300 |
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| 基金项目： | 浙江省重点研发计划项目(2018C03028)。 |
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| 摘 要： | 目的 进一步了解杭嘉湖平原水稻Oryza sativa主产区嘉兴市稻田土壤重金属污染及水稻生产安全现状。 方法 于2018年选择嘉兴市典型水稻主产区域开展调查分析。在水稻收获期进行土壤和水稻协同采样，测定土壤和大米样品中镉、铅、铬和砷等4种重金属元素质量分数，采用单因子污染指数法和内梅罗综合污染指数法、潜在生态风险指数法及生态风险预警指数法等对水稻土重金属污染水平及污染风险进行评价。 结果 研究区域土壤镉、铅、铬和砷质量分数变幅分别为0.01~1.92、17.60~34.80、47.00~123.00、3.97~9.89 mg·kg?1，平均质量分数分别为0.36、25.78、72.73和7.55 mg·kg?1；土壤重金属镉质量分数超过水稻生产的土壤安全阈值(GB/T 36869?2018《水稻生产的土壤镉、铅、铬、汞、砷安全阈值》)的样本比例占31.82%；4种重金属的潜在生态风险由强至弱依次为镉、砷、铅、铬，区域整体上表现为轻微潜在生态风险；部分土壤镉质量分数超标，但水稻籽粒镉质量分数均没有超标。 结论 研究区稻米各项指标均符合GB 2762?2017《食品中污染物限量》，土壤总体上处于安全水平。在今后的水稻生产管理中仍需加强动态监测，关注土壤镉形态转化和有效性的变化，充分保障水稻粮食生产安全。图1表8参29
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| 关 键 词： | 水稻土 重金属污染 农产品安全 风险评价 稻米镉 嘉兴市 |
| 收稿时间： | 2020-05-10 |
Survey and risk assessment of soil heavy metals in the main rice producing areas in Hangjiahu Plain |
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| MA Jiayan,MA Jiawei,LIU Dan,FU Weijun,YE Zhengqian.Survey and risk assessment of soil heavy metals in the main rice producing areas in Hangjiahu Plain[J].Journal of Zhejiang A&F University,2021,38(2):336-345. |
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| Authors: | MA Jiayan MA Jiawei LIU Dan FU Weijun YE Zhengqian |
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| Affiliation: | 1.State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China2.Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China |
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| Abstract: | Objective]This study aims to investigate the status of heavy metal pollution in soil and rice safety in Jiaxing,the main paddy field of Oryza sativa in Hangjiahu Plain.Method]In 2018,Jiaxing City was selected as the main rice producing area for investigation and analysis.Soil and rice were sampled during rice harvest period to determine the contents of four heavy metal elements(Cd,Pb,Cr,and As)in soil and rice samples.The pollution level and risk of heavy metals in paddy soil were evaluated by single factor pollution index method,Nemero comprehensive pollution index method,potential ecological risk index method and ecological risk early warning index method.Result]Contents of Cd,Pb,Cr,and As in soil were 0.01-1.92,17.60-34.80,47.00-123.00 and 3.97-9.89 mg·kg-1,with an average of 0.36,25.78,72.73,and 7.55 mg·kg-1 respectively.The proportion of soil samples whose Cd content exceeded the soil safety threshold for rice production(Safety Threshold Values of Cadmium,Lead,Chromium,Mercury and Arsenic in Soil For Rice Production,GB/T 36869-2018)reached 31.82%.The potential ecological risks of the four heavy metals from strong to weak were Cd,As,Pb,and Cr,and the region as a whole presented slight potential ecological risks.Cd content in rice grain was safe according to the national criterion,although Cd content exceeded the national standard(GB/T 36869-2018)in some soil.Conclusion]All indexes of rice in the study area are in line with National Food Safety Standard Limits of Contaminants in Food(GB 2762-2017)and the soil is generally at a safe level for rice production.In the future it’s necessary to monitor changes of heavy metals in soil,especially transformation and availability of Cd,in order to guarantee safe rice production. |
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| Keywords: | paddy soil heavy metal pollution agricultural product safety risk assessment rice cadmium Jiaxing City |
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