土壤pH·淹水调控与低镉积累品种在水稻大田生产上的降镉效果

Cadmium Reduction Effects of Soil pH,Flood Control and Low Cadmium Accumulation Variety in Rice Field Production

[目的]研究土壤pH、淹水调控与低镉积累品种在水稻大田生产上的降镉效果。[方法]通过土壤pH、淹水调控与低镉积累品种等多项镉污染防治措施的应用,探索镉污染稻田水稻安全生产技术模式。[结果]pH<6.5时,VIL、V、IL 3种处理均使土壤有效Cd上升,上升幅度表现为VIL<IL<V,且VIL与V、IL处理有较大差异;当土壤pH>6.5时,VIL、IL处理有降低土壤有效Cd的效果。2种处理均能对水稻糙米Cd积累产生明显的负影响,其影响程度和一致性表现为VIL>V>IL,且VIL、V处理效果远优于IL处理。[结论]在不同环境因素下,单一的淹水管理+土壤pH调控或低镉积累型品种措施,在降低糙米Cd积累效果方面不稳定,多措施的综合应用能取得更好的效果。

[Objective] To study cadmium reduction effects of soil pH,flood control and low cadmium accumulation variety in rice field production.[Method]Through the application of a number of measures to prevent and control cadmium pollution,such as soil pH,flood control and low cadmium accumulation variety,the safe production technology model of rice in cadmium-contaminated rice fields was explored.[Result]When pH6.5,VIL,V and IL all increased the soil effective Cd content,and the increase range was VIL IL V. There was significant differences between VIL and V,IL. When soil pH 6.5,VIL and IL treatment had the effect of reducing soil Cd. Both treatments had a significant negative effect on Cd accumulation of rice,and the degree and consistency of these two treatments were VIL VIL,and the effect of VIL and V was much better than that of IL.[Conclusion]Under different environmental factors,single flood management ＋ soil pH adjustment or low cadmium varieties of oic increase,reducing brown rice Cd accumulation effect is not stable,the integrated application of many measures can obtain a better result.