Study on the Adsorption Capacity of Different Crops for Heavy Metals in Agricultural Soil

研究区土壤重金属污染严重，农业种植是当地居民主要的生活保障及经济来源，因此，农用地不同农作物对土壤重金属的吸附能力研究有重要意义。研究区土壤存在Cd、As、Cu污染。研究区农产品中水稻主要超标元素为：Cd、As、Pb、Cr，可能是由于土壤中Cd、As元素含量高于风险筛选值，土壤中Pb虽然未超过风险值，但超过当地土壤背景值，Cr既未超过风险筛选值，且与当地土壤背景值接近，水稻中的Cr的超标可能与作物本身对Cr的吸收和富集有关；玉米超标元素为Cd，大蒜和胡萝卜样品不存在重金属含量超标现象。The soil in the project area is seriously polluted by heavy metals, and agricultural planting is the main life guarantee and economic source for local residents. It is of great significance to study the adsorption capacity of different crops on agricultural land for soil heavy metals. The project area is polluted by Cd, As and Cu. The main elements of rice in the project area are: Cd, As, Pb Cr, which may be due to the content of Cd and As elements in the soil is higher than the risk screening value, although Pb in the soil does not exceed the risk, it exceeds the local soil background value, and Cr does not exceed the risk screening value and is close to the local soil background value. The exceedance of Cr in rice may related to the absorption and accumulation of Cr by the crops themselves. The exceeding elements of corn are Cd, and there is no phenomenon of heavy metal content exceeding the standard in garlic carrot samples.