Effects of Superparamagnetic Nano-Functional Material MFC on Soil Microorganisms and Enzyme Activities in Cadmium-Contaminated Paddy Fields
Magnetic nano-Fe3O4@Ca(H2PO4)2 functionalized materials (MFC) were prepared by using magnetic nano Fe3O4 and phosphate as raw materials. The rice cultivation experiment was conducted after cadmium-contaminated paddy fields remediated in vitro by magnetic separation with MFC. The effects of remediation of cadmium-contaminated paddy fields by MFC magnetic separation on soil microbial commu-nity composition and soil enzyme activity of cadmium-contaminated paddy field were studied. The results showed that the application of MFC to repair cadmium-contaminated paddy fields could significantly reduce the total Cd and available Cd contents in soil. Addition of 0.5％ and 1.0％ MFC reduced soil total Cd by 22.14％ and 24.08％,and available Cd by 2.29％ and 12.21％,respectively. The MFC treatment groups showed higher soil Shannon index and Chao1 index than the control group at all three stages of rice growth,indicating an increase in soil bacterial community diversity and richness during the rice growth period. Compared with the control group,in the soil of treatment group,the Ascomycota abundance increased in the heading stage,and the Rozellomycota abundance increased significantly in the mature stage (p<0.05),indicating an increase in the diversity and richness of soil fungal communities during rice booting and maturing stages. At the same time,the activities of urease and dehydrogenase in the soil during the growth period of rice were increased. Among them,the Y-0.5％ treatment group showed a 55.40％ increase in soil urease activity in the mature stage,while the Y-0.5％ treatment group showed a 44.40％ and 37.21％ increase in soil dehydrogenase activity in the heading stage and mature stage,respec-tively,with significant differences (p<0.05),while the activity of soil catalase decreased.
magnetic nano-Fe3O4@Ca(H2PO4)2 functionalized materialssoilcadmiumsoil microbiotasoil enzyme activity
万方数据
维普
