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Journal of Agriculture ›› 2019, Vol. 9 ›› Issue (7): 37-43.doi: 10.11923/j.issn.2095-4050.cjas18030011

Special Issue: 园艺

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Effects of Nano-magnesium Hydroxide, Ryegrass and Arbuscular Mycorrhiza on Radish Cd Concentration and Soil Cd Chemical Forms and Microbial Populations

  

  • Received:2018-03-13 Revised:2018-05-07 Accepted:2018-05-25 Online:2019-08-13 Published:2019-08-13

Abstract: A field experiment was conducted to study the effect of nano magnesium hydroxide (nMg), interplanting ryegrass and arbuscular mycorrhizal fungi (AMF) on Cd concentration in radish and ryegrass, and soil Cd chemical forms, Cd concentrations, and microorganism populations. The results showed that compared with control, Cd concentration of shoot and root in“nMg”,“nMg +AMF”,“nMg + ryegrass”and“nMg +AMF + ryegrass”treatment decreased by 13.7%-17.4% (shoot) and 32.5%-41.4% (root), respectively. Compared with control, soil Cd concentration decreased by 7.3%-17.1%. Soil Cd chemical forms were in the order of RES-Cd > FeMn-Cd > CAB-Cd > OM-Cd > EX-Cd, and the concentration of EX-Cd in soil reduced after the application of arbuscular mycorrhizal fungi. After planting ryegrass and inoculating arbuscular mycorrhizal fungi, the number of bacteria in soil increased significantly, while the number of actinomycetes in soil did not change significantly. Compared with control, soil pH value and CEC increased significantly in“nMg”,“nMg +AMF”, “nMg + ryegrass”and“nMg +AMF +ryegrass”treatment by 7.0%-11.1% and 66.7%-76.9%. In general,“nMg + AMF +ryegrass”is better than single or combined remediation methods in cadmium contaminated soil.

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