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采用田间试验方法,研究了土壤中镉浓度分别为2和5mg·kg-1时,向日葵(Helianthusannuus)、玉米(Zea mays)和大豆(Glycine max)从苗期至成熟期各生长阶段茎叶中镉积累与全硫含量的关系。结果表明,玉米和向日葵各生长时期茎中镉含量与其全硫含量呈极显著相关,叶片中镉含量与硫含量没有相关性,说明硫在植物镉的运输过程中发挥着重要的作用。土壤中镉浓度为2mg·kg-1时,籽实中镉含量从高到低的顺序是:向日葵>大豆>玉米;土壤中镉浓度为5mg·kg-1时,籽实中镉含量从高到低的顺序是:大豆>向日葵>玉米,与籽实中硫含量的高低顺序一致;玉米籽实中镉含量最低,在2个镉浓度处理下平均值仅为0.01和0.03mg·kg-1,低于国家标准食品中镉限量值。
Field experiments were conducted to study the effects of cadmium on the growth and development of Helianthus annuus, Zea mays and Glycine max in the stems and leaves of different growth stages at the concentrations of 2 and 5 mg · kg- Relationship between Cadmium Accumulation and Total Sulfur Content. The results showed that the contents of cadmium in the stems of maize and sunflower were significantly correlated with the contents of total sulfur. There was no correlation between the content of cadmium and the content of sulfur in the leaves, indicating that sulfur plays an important role in the transport of cadmium. When the concentration of cadmium in soil was 2 mg · kg-1, the order of cadmium content in seeds was: sunflower> soybean> corn. When the concentration of cadmium in soil was 5 mg · kg-1, the content of cadmium in seeds was from high to low The order was: soybean> sunflower> corn, which was consistent with the order of the sulfur content in the seed; the lowest content of cadmium in corn seed was only 0.01 and 0.03 mg · kg-1 under the two cadmium concentrations, Standard food limited value of cadmium.