对农田土壤重金属污染的评价和控制，对发展绿色食品的果蔬基地意义重大。采

对农田土壤重金属污染的评价和控制，对发展绿色食品的果蔬基地意义重大。采选重庆市近郊某区的2个典型的绿色果蔬生产基地的土壤为研究对象，系统分析了土壤中Cd、As、Pb、Cr、Cu、Ni、Zn、Ti和Se等9种重金属元素的含量，并以NY/T 391-2000、GB15618-2018和重庆市土壤背景值评价标准，通过单因子和内梅罗污染指数法、地积累指数法和生态危害指数法对土壤的重金属污染状况进行了评价。单因子和内梅罗污染指数法的结果表明，2个基地土壤样品的5种重金属元素单因子指数均小于1.0；内梅罗污染指数分别为0.6743和0.6091，接近0.70。地积累指数评价的结果显示2个基地的土壤均未受Cd、Cu、Ni、Zn这4种金属的污染，已受As、Pb的轻度污染。土壤潜在生态危害指数及风险程度分析评价的研究结果显示，基地-XY和基地-KY的土壤风险系数最大的均是Cd，分别为26、19，总的潜在生态风险指数RI分别为64、54，说明2个基地土壤的生态风险较低。

对农田土壤重金属污染的评价和控制，对发展绿色食品的果蔬基地意义重大。 采选重庆市近郊某区的2个典型的绿色果蔬生产基地的土壤为研究对象，系统分析了土壤中Cd、As、Pb、Cr、Cu、Ni、Zn、Ti和Se等9种重金属元素的含量，并以NY/T 391-2000、 GB15618-2018和重庆市土壤背景值评价标准，通过单因子和内梅罗污染指数法、地积累指数法和生态危害指数法对土壤的重金属污染状况进行了评价。 单因子和内梅罗污染指数法的结果表明，2个基地土壤样品的5种重金属元素单因子指数均小于1.0；内梅罗污染指数分别为0.6743和0.6091，接近0.70。 地积累指数评价的结果显示2个基地的土壤均未受Cd、Cu、Ni、Zn这4种金属的污染，已受As、Pb的轻度污染。 土壤潜在生态危害指数及风险程度分析评价的研究结果显示，基地-XY和基地-KY的土壤风险系数最大的均是Cd，分别为26、19，总的潜在生态风险指数RI分别为64、54，说明2个基地土壤的生态风险较低。

The evaluation and control of heavy metal pollution in farmland soil is of great significance to the development of green food base. The contents of CD, as, Pb, Cr, Cu, Ni, Zn, Ti and Se in the soil of two typical green fruit and vegetable production bases in a suburb of Chongqing were analyzed systematically. Based on NY / T 391-2000, gb15618-2018 and Chongqing soil background value evaluation standard, the single factor and Nemero pollution index method, land accumulation index method and ecological hazard method were used. The heavy metal pollution of soil was evaluated by index method. The results of single factor and Nemero pollution index showed that the single factor indexes of five heavy metals in the soil samples of the two bases were all less than 1.0; the Nemero pollution index was 0.6743 and 0.6091, close to 0.70, respectively. The results of land accumulation index showed that the soils of the two bases were not polluted by CD, Cu, Ni and Zn, but slightly polluted by as and Pb. The results of analysis and evaluation of potential ecological hazard index and risk degree of soil showed that the largest soil risk coefficient of base-xy and base-ky was CD, which was 26 and 19 respectively, and the total potential ecological risk index RI was 64 and 54 respectively, indicating that the ecological risk of soil in the two bases was relatively low.<br>