| 基于成土母质分区的土壤-作物系统重金属累积特征与健康风险评价 |
| 摘要点击 1743 全文点击 442 投稿时间：2022-03-22 修订日期：2022-04-29 |
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| 中文关键词 成土母质|土壤重金属|地质高背景|土壤-作物系统|健康风险 |
| 英文关键词 parent material|soil heavy metals|high geological background|soil-crop system|health risks |
| 作者 | 单位 | E-mail | | 陈子万 | 云南省地质调查院, 昆明 650216
成都理工大学地球科学学院, 成都 610059
成都理工大学地学核技术重点实验室, 成都 610059
自然资源部三江成矿作用及资源勘查利用重点实验室, 昆明 650051 | ChenZW_cdut@outlook.com | | 许晶 | 云南省地质调查院, 昆明 650216
自然资源部三江成矿作用及资源勘查利用重点实验室, 昆明 650051 | yj_890209@126.com | | 侯召雷 | 云南省地质调查院, 昆明 650216
自然资源部三江成矿作用及资源勘查利用重点实验室, 昆明 650051 | | | 彭敏 | 中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 | | | 杨帆 | 中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 | | | 陈杰 | 云南省地质调查院, 昆明 650216
自然资源部三江成矿作用及资源勘查利用重点实验室, 昆明 650051 | | | 徐永强 | 云南省地质调查院, 昆明 650216
自然资源部三江成矿作用及资源勘查利用重点实验室, 昆明 650051 | | | 杨树云 | 云南省地质调查院, 昆明 650216
自然资源部三江成矿作用及资源勘查利用重点实验室, 昆明 650051 | | | 李家云 | 云南省地质调查院, 昆明 650216
自然资源部三江成矿作用及资源勘查利用重点实验室, 昆明 650051 | | | 于林松 | 成都理工大学地球科学学院, 成都 610059
成都理工大学地学核技术重点实验室, 成都 610059 | |
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| 中文摘要 |
| 滇东北是中国西南典型的土壤重金属高背景地区,土壤中重金属普遍富集,土壤重金属分布和区域内农作物的安全性值得关注.根据滇东北土壤成土母质分区,以1137组农作物和对应的根系土壤为研究对象,采用元素赋存形态分析和慢性健康风险评价法开展土壤-作物系统重金属累积特征和农作物健康风险评价.结果表明,铅锌矿集区土壤Cd和Pb重金属均高于《土壤环境质量农用地土壤污染风险管控标准》(GB 15618-2018)土壤污染管制值,其余母质区土壤Cd介于筛选-管制缓冲区内,Pb则低于最低土壤风险筛选值.依据《食品安全国家标准食品中污染物限量》(GB 2762-2017),区内土豆和黄豆中重金属Cd超标严重,苦荞和核桃中重金属Pb超过限量值,农作物重金属Cd超标率为:碎屑岩母质区＞玄武岩母质区＞铅锌矿集区＞碳酸盐岩母质区≈第四系沉积物区＞砂(泥)岩母质区.同时,根据美国环保署对于人体摄入重金属慢性健康风险评估方法可知,谷薯类主食和水果类均存在重金属摄入慢性健康低风险,其中碎屑岩母质区、砂(泥)岩母质区、第四系沉积物区和铅锌矿集区这4个区域内农作物显示较高的人体健康风险,且随着土壤理化性质改变和食用农作物种类的增加,风险将逐渐增大. |
| 英文摘要 |
| This study used both the element occurrence form analysis and the chronic health risk assessment method to investigate the accumulation characteristics of heavy metals in the soil-crop system and the health risk assessment of agricultural products in northeastern Yunnan, which is a typical area of Southwest China where heavy metals are enriched in soil. Based on the study of 1137 groups of agricultural products and corresponding root soils, the results showed that the soil cadmium (Cd) and lead (Pb) in the lead-zinc ore concentration area were higher than the risk-intervention values of the "Soil Environmental Quality Risk control standard for soil contamination of agricultural land" (GB 15618-2018), whereas the soil Cd in the other parent material areas was within the screening-intervention buffer zone, and Pb was below the minimum risk-screening value. According to the National Food Safety Standard of China (GB 2762-2017), the heavy metal Cd in potatoes and soybeans in the area seriously exceeded the standard, the heavy metal Pb in tartary buckwheat and walnut exceeded the limit value, and the exceeding rate of heavy metal Cd in crops from these parent material areas showed: clastic rock>basalt>lead-zinc ore>carbonate ≈ Quaternary sedimentary>sand (mud) rock. According to the U.S. Environmental Protection Agency's assessment method for the chronic health risk of heavy metal intake by humans, the grains and potatoes, staple foods, and fruits had low chronic health risks of heavy metal intake. Agricultural products from the parent material area of clastic rock, sand (mud) rock, Quaternary sedimentary, and lead-zinc ore concentration showed health risks; with the change in soil physical and chemical properties and the increase in the types of edible crops, the risk will gradually increase. Based on this research, it is urgent to carry out real-time monitoring of agricultural products in the area. |
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