用幼苗表示土壤Cd污染临界值的可行性研究

盆栽试验，以小麦、油菜、大豆为对象，研究用作物幼苗含Cd量替代成熟期可食部位含Cd量表示土壤污染临界值。结果表明，3种作物幼苗含Cd量均高于成熟期可食部位含Cd量，且均与土壤投Cd量、以及与各自成熟期作物可食部位含Cd量呈极显著正相关，表示苗Cd不仅可以指示土壤污染，还可以通过苗Cd与成熟期可食部位Cd的相关回归方程计算相当于达标临界值的苗Cd污染临界值。

Study on the Feasibility for the Pollution Critical Concentration of Cd in Soil by Plant Seedling

Pot experiments were conducted to study the feasibility for the pollution critical concentration of Cd in soil indicated by the concentration of Cd in seedling instead of those of harvested parts of wheat,soybean and rape. The results showed that concentration of Cd in three plant seedlings were not only highly positively correlated to it both in soil and those in their harvest parts but also higher than those in their harvest parts. The concentration of Cd in seedling can be used to indicate the pollution critical concentration of Cd in soil. The pollution critical concentration of Cd in seedling equivalent to the standard critical concentration can be calculated by the regression equation between the concentration of Cd in the seedlings and it in the harvested parts.