关键词: 植物修复, 土壤, 有机污染

Abstract: In a water culture experiment, rice seedlings were grown in a nutrient solution containing 10 μmol Cd·L^-1, and harvested after different durations of growth. Two treatments were installed, i . e ., adding 50 mg Fe²⁺·L^-1 to induce the formation of iron coating on seedlings root surface (treatment Fe₅₀), and the control. The study on the dynamics of the Cd adsorption on root surface and of the Cd uptake by plant showed that both in the treatment Fe₅₀ and in the control, the amount of adsorbed Cd on root surface was the highest in the first 2 hours, decreased dramatically then and remained relatively stable thereafter, while the Cd concentrations in roots and shoots increased slow-ly within the first 8 hours and rapidly then. The increment of Cd concentrations in roots and shoots was smaller in treatment Fe₅₀ than in the control, and the amounts of adsorbed and absorbed Cd also showed the same picture, suggesting that the iron coating on rice root surface had little effect on the dynamics of Cd content in different parts of rice seedlings, and the reduced Cd uptake in treatment Fe₅₀ was probably relevant with the Fe concentration in roots.

Key words: Phytoremediation, Soil, Organic pollutants