不同类型土壤调理剂对土壤-水稻系统重金属含量的影响

以天然矿物类土壤调理剂、复合微生物肥、微生物菌剂为材料,在湖南省典型稻田开展田间试验,研究不同类型土壤调理剂对土壤-水稻系统重金属含量的影响。结果表明:施用天然矿物类土壤调理剂和复合微生物肥均能提高土壤的p H值,降低土壤中的有效镉和稻米中的总镉含量;施用不同类型土壤调理剂可以降低稻米中的重金属镉、铬、汞、砷含量,其中,天然矿物类土壤调理剂对于降低稻米中总镉和总铬的效果比复合微生物肥和微生物菌剂更明显,但施用天然矿物类土壤调理剂后,水稻产量有所降低;施用复合微生物肥和微生物菌剂对于降低稻米中的总镉、总铬含量也有一定效果,且可提高水稻产量。

Effects of Different Types of Soil Conditioners on Heavy Metal Content in Soil-Rice System

Field experiments were conducted to study the effects of different types of soil conditioners (natural mineral class soil conditioners, compound microbial fertilizers, microbial inoculants) on heavy metal content in soil-rice system at the typical paddy ifelds of Hunan. The results showed that applying natural mineral class soil conditioners and compound microbial fertilizers could improve the soil pH values, and reduce the available Cd content in soil and the total Cd content in rice. Application of different types of soil conditioners could reduce the content of Cd, Cr, Hg, and As in rice. Among them, natural mineral class soil conditioners were better than compound microbial fertilizers and microbial inoculants for the effects about reducing the total content of Cd and Cr in rice. But the rice yield decreased when applying natural mineral class soil conditioners. Compound microbial fertilizers and microbial inoculants had certain effects on reducing the content of the total content of Cd and Cr, and could increase the yield of rice.