不同土壤调理剂对镉污染水稻田控镉效应研究

Effects of different soil conditioners on cadmium control in cadmium-contaminated paddy fields

选用森美思纳米陶瓷材料、楚戈、袁梦牌土壤调理剂、土调1号、改性海泡石五种土壤重金属调理剂,分别在湖南湘潭、湖北大冶、广东韶关、广西河池受重金属镉(Cd)污染水稻田开展大田控镉试验,探讨五种调理剂对不同类型土壤中Cd有效态含量、土壤p H值及稻米Cd含量的影响,结果表明:Cd污染稻田土加入不同土壤调理剂后,土壤p H值提高了0.54~2.06个单位,土壤有效态Cd含量显著降低(P<0.05),与对照处理相比,有效态Cd含量下降11.4%~31.8%;施用土壤调理剂,可有效降低稻米Cd含量,与对照相比,森美思纳米陶瓷材料处理中稻米Cd降低了17.1%~44.2%,楚戈处理中降低了14.3%~66.1%,袁梦牌土壤调理剂处理中降低了43.6%~76.8%,土调1号处理中降低了18.2%~80.8%,改性海泡石处理中降低了72.2%~82.7%;施用五种土壤调理剂后水稻产量均未显著减少。

This paper selected five soil heavy metal conditioners SAMMNS Nano-ceramic materials,Chuge,Yuanmeng soil conditioner,Soil conditioning No.1,Modified sepiolite.The effects of five conditioners on Cd availability,soil pH and Cd content in different types of soils were investigated by Field-controlled cadmium tests conducted in cadmium-contaminated paddy fields in Xiangtan,Hubei Daye,Guangdong Shaoguan and Guangxi Hechi.The results showed that:After adding different soil conditioners to Cd-contaminated paddy soils,the soil pH values increased by 0.54 to 2.06 units and the soil available Cd content decreased significantly(P<0.05).Compared with the control,the available states were effective.The content of Cd decreased by 11.4%~31.8%.The application of soil conditioner can effectively reduce the Cd content of rice.Compared with the control,the rice Cd of the SAMMNS Nano-ceramic materials treatment decreased by 17.1%to 44.2%,the rice Cd of the Chuge treatment decreased by 14.3%to 66.1%and the rice Cd of the Yuanmeng soil conditioner treatment decreased by 43.6%~76.8%,the rice Cd decreased by 18.2%~80.8%in the Soil conditioning No.1 treatment and the rice Cd decreased by 72.2%~82.7%in the Modified sepiolite treatment.The effect of applying soil conditioners on rice yield found that the application of the five soil conditioners did not produce a significant reduction in rice yield.