文章通过田间试验研究了原位钝化、叶面阻控和水分调控 3 种安全利用技术措施在 Cd污染水稻田的治理效果，通过对治理后土壤 Cd有效态含量和糙米中 Cd含量的综合分析，以期得出适宜当地的安全利用技术措施。结果表明，钝化剂处理可以降低土壤有效态 Cd含量和水稻糙米中的 Cd 含量，其中腐殖酸处理效果最佳。叶面阻控和水分调控对降低水稻糙米中的 Cd含量也起到一定效果，其中有机硅和无机硒混合叶面肥(Se+Si)效果要优于单一叶面肥。全生育期淹水效果优于其他水分管理措施，该措施下糙米中 Cd含量最低，为 0。27 mg·kg-1。综合表明，在酸性土壤的高 Cd 背景下，3 种安全利用技术措施下水稻糙米中的 Cd 含量虽然均超过GB 2762-2022《食品安全国家标准 食品中污染物限量》标准，但均能显著降低糙米中的 Cd含量，以单一技术措施来看，安全利用效果为原位钝化>水分调控>叶面阻控。
Application effects of different safe utilization techniques on cadmium-contaminated paddy fields in Anji
Field experiments were conducted to study the effect of three safe utilization techniques,namely in situ passivation,leaf surface control and water regulation,on the control of cadmium(Cd)-contaminated paddy fields.Through comprehensive analysis of the effective state content of Cd in soil after treatment and the content of Cd in brown rice,the appropriate local safe utilization techniques were obtained.The results showed that the active content of Cd in soil and the content of Cd in brown rice were decreased after passivating agent treatments,among which humic acid treatment had the best effect.Leaf surface intibitor and water control also had certain effect on the reduction of Cd content in brown rice.The mixed leaf surface fertilizer(Se+Si)of organosilicon and inorganic selenium was better than single leaf surface fertilizer.The flooding during of the whole growth period was better than other water management measures,and the lowest Cd content in brown rice under this measure was 0.27 mg·kg-1.The results showed that under the background of high Cd in acidic soil,the Cd content in brown rice of the three safe utilization techniques all exceeded the standard of GB 2762-2022《National Standard for Food Safety-Limits of Contaminants in Food》,but all of them could significantly reduce the Cd content in brown rice.The safe utilization effect showed as in-situ passivation>water regulation>leaf surface resistance control.
万方数据
维普
