| 息朝庄.贵州惠水农作物-土壤剖面重金属污染评价[J].地质与勘探,2022,58(4):822-835 |
| 贵州惠水农作物-土壤剖面重金属污染评价 |
| Evaluation of heavy metals in crop-soil profiles of Huishui County in Guizhou Province |
| 投稿时间：2021-05-25 修订日期：2021-08-25 |
| DOI：10.12134/j.dzykt.2022.04.011 |
| 中文关键词: 重金属 地球化学 农作物 惠水县 贵州 |
| 英文关键词: heavy metal, geochemistry, crop, Huishui County, Guizhou Province |
| 基金项目:国家自然科学基金和贵州喀斯特科学研究中心联合项目（编号：U1812402）、湖南省教育厅科学研究一般项目（编号：20C0381）、益阳市社科联项目（编号：2021YS133）联合资助 |
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| 中文摘要: |
| 为研究贵州省惠水县农作物-土壤重金属污染现状，采集农作物-根系土、土壤剖面-成土母岩样品，测定Cd、Hg、As、Pb、Cr、Cu、Ni、Zn和pH的含量，选用富集系数、健康风险评估、单因子污染指数法、地累积指数法对农作物-土壤重金属污染现状进行了评价。研究表明：（1）农作物中水稻、玉米和油菜中以Cd累积为主,其次为Pb、Cr、Hg；金钱橘无重金属超标；农作物富集系数中Cd是Pb、As、Cr的几倍至上百倍；经玉米、油菜、金钱橘摄入重金属的人体健康风险很低；水稻中Cd的THQ大于1，对人体的健康有一定的风险;（2）单因子污染指数研究结果说明根系土以Cd污染为主；Ig揭示根系土中Hg、Cd、Cr超标可能受人类活动影响较大;（3）从土壤剖面-成土母岩系统来看，As、Cd、Cu具有继承性，尤其Cd含量在成土母岩、土壤剖面、根系土、农作物中含量超标，有部分来源于成土母岩高背景值。 |
| 英文摘要: |
| This work aims to present the heavy metal pollution of crop-soils in Huishui County, Guizhou Province. In this study area, samples from crop-root soils and soil profile-parent rocks were collected to measure the Cd, Hg, As, Pb, Cr, Cu, Ni, Zn contents and pH, and then concentration coefficient, health risk assessment, single factor pollution index and soil accumulation index were adopted to evaluate the heavy metal pollution of crop-soils. The results show that: (1) The rice, corn and rape were dominated by the accumulated element of Cd, followed by Pb, Cr and Hg. The kumquat was in no excess standard with heavy metal. The enrichment coefficient of Cd in crops was several to hundred times of Pb, As and Cr. Human health risks associated with heavy metals ingested through corn, rape and kumquat were low, and the THQ of Cd in rice was greater than 1, which brought certain risk to human health. (2) Single factor pollution indices show that the root soil was mainly polluted by Cd. And the Ig revealed that excessive Hg, Cd and Cr in root soil might be greatly affected by human activities. (3) The As, Cd and Cu were inherited from the soil profile-parent rock system. The content of Cd in parent rock, soil profile, root soil and crops especially exceeded the standard, and some of them were derived from the high background value of parent rock. |
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