纳米氢氧化镁、黑麦草套种和丛枝菌根对萝卜Cd含量和土壤Cd化学形态及微生物数量的影响

doi:10.11923/j.issn.2095-4050.cjas18030011

摘要/Abstract

摘要： 采用大田试验研究了土壤Cd污染施加纳米氢氧化镁(nMg)、套种黑麦草和接种丛枝菌根真菌(arbuscular mycorrhizal fungi, AMF)对萝卜和黑麦草Cd含量,土壤Cd形态及含量、土壤微生物数量的影响。结果表明,与对照处理相比,“nMg”、“nMg +AMF”、“nMg +黑麦草”和“nMg +AMF+黑麦草”4个处理,均不同程度降低了萝卜根和地上部Cd含量,降低幅度分别为32.5%~41.4%和13.7%~17.4%。与对照相比,各处理土壤全Cd含量明显降低,降幅为7.3%~17.1%。土壤中Cd形态含量多少顺序为残渣态(RES-Cd)> 铁锰氧化态(FeMn-Cd)> 碳酸盐态(CAB-Cd)> 有机态(OM-Cd)> 可交换态(EX-Cd),接种丛枝菌根真菌后降低了土壤中的EX-Cd含量。种植黑麦草和接种丛枝菌根真菌后土壤细菌数量显著增多,放线菌数量无显著变化。和对照相比,“nMg”、“nMg +AMF”、“nMg +黑麦草”和“nMg +AMF+黑麦草”4个处理土壤的pH和CEC均显著升高,增幅为7.0%~11.1%和66.7%~76.9%。综上结果表明,原位钝化-植物-微生物联合修复技术比单一或两者联合修复技术效果更好。

关键词: 生物絮团, 生物絮团, 水产养殖, 细菌群落结构, 研究进展

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.

中图分类号:

杨聪,陈胜伦,刘豫,金卓君,张春来,徐卫红. 纳米氢氧化镁、黑麦草套种和丛枝菌根对萝卜Cd含量和土壤Cd化学形态及微生物数量的影响[J]. 农学学报, 2019, 9(7): 37-43.

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