沐川某农田土壤-作物重金属富集特征及生态风险评价  

Characterization of Soil-crop Heavy Metal Enrichment in A Farmland in Muchuan and Evaluation of Ecological Risk

作　　者：蒙金伟 刘俊秀 MENG Jin-wei;LIU Jun-xiu(School of Earth Sciences,Chengdu University of Technology,Sichuan Chengdu 610059,China)

机构地区：[1]成都理工大学地球科学学院,四川成都610059

出　　处：《广州化工》2023年第24期94-98,118,共6页GuangZhou Chemical Industry

摘　　要：为了解沐川某富硒耕地土壤和作物中重金属的富集情况和生态风险。采用风险评价编码法、地累积指数法、潜在生态危害指数法和相性关分析等方法,对土壤和作物中的重金属的生态风险和来源进行分析。地累积指数评价结果显示,研究区土壤Cd为中度污染,Cu和Hg为轻微污染。潜在生态危害指数法评价发现,研究区整体处于强度风险,Cd和Hg分别为很强风险和中度风险。风险评估指数法评价显示,Cd为中度污染风险。水稻籽实和玉米籽实重金属平均含量均未超过国家安全限量值,整体呈现安全状态。相关性分析和主成分分析结果显示Cu、Ni、Cr和Zn来源相似可能受到地质背景的影响;Pb、Cd、As来源相似可能受到农业和交通等人类活动和地质背景的混合影响。In order to understand the enrichment and ecological risk of heavy metals in soil and crops of a selenium-rich cropland in Muchuan.The ecological risks and sources of heavy metals in soil and crops were analyzed by using the risk evaluation coding method,the geoaccumulation index method,the potential ecological risk index method and correlation analysis.The results of the geoaccumulation index evaluation showed that the soil in the study area was moderately polluted for Cd and slightly polluted for Cu and Hg.The evaluation of potential ecological risk index method found that the study area as a whole was at strong risk,and Cd and Hg were at very strong and moderate risk,respectively.The evaluation of risk assessment index method revealed that Cd was at moderate risk of contamination.The average content of heavy metals in rice seeds and corn seeds did not exceed the national safety limit values,and the overall situation was safe.The results of correlation analysis and principal component analysis showed that the sources of Cu,Ni,Cr and Zn were similar and might be influenced by geological background,the sources of Pb,Cd and As were similar and might be influenced by a mixture of human activities such as agriculture and transportation and geological background.

关 键 词：农田土壤 作物 重金属 生态风险 

分 类 号：P595[天文地球—地球化学]