After introduction of the heavy metals into the paddy soil, the downwards migration was 45 cm and 30 cm depth for Cd and Cu respectively regardless of the doses.

• 外源重金属元素Cd、Cu施入土壤后,无论是低剂量还是高剂量处理,水田土壤Cd元素已迁移到45cm的深度,而Cu元素迁移到30cm的深度。