油菜、龙葵、苎麻对镉、砷复合污染农田土壤的修复效果

Repair effect of rapeseed,Solanum nigrum and ramie on farmland soil contaminated by cadmium and arsenic

以油菜、龙葵、苎麻为试材,采用室内盆栽试验研究了油菜、龙葵、苎麻对耕地土壤中Cd和As的吸附效果和富集转移效应,并施加沼泽红假单胞菌和黑曲霉两种微生物,探讨了微生物对油菜、龙葵和苎麻净化重金属污染土壤的应用潜力。结果表明,油菜和龙葵对土壤中重金属Cd的吸附效果较好,表现出富集特性,而苎麻植株对Cd的吸收效果较差。其中油菜植株体内Cd含量大小表现为油菜茎杆>油菜根>油菜子,龙葵植株体内Cd含量大小表现为龙葵茎>龙葵果>龙葵根;油菜、龙葵、苎麻对土壤中As吸附效果均较差;沼泽红假单胞菌和黑曲霉两种微生物对促进油菜、龙葵和苎麻吸收土壤中Cd和As的作用均较小。油菜更适宜用作Cd重金属污染土壤的修复植物。

Taking rapeseed,Solanum nigrum,and ramie as test materials,the adsorption and enrichment of Cd and As in cultivated soil by rapeseed,Solanum nigrum and ramie were studied in pot experiment.Two microorganisms,Rhodopseudomonas palustris and Aspergillus niger,were applied to explore the application potential of rapeseed,Solanum nigrum and ramie to purify heavy metals polluted soil.The results showed that rapeseed and Solanum nigrum had better adsorption effects on Cd in soil,showing enrichment characteristics,while ramie plants had a poor absorption effect on Cd.The order of Cd content in rapeseed plants was:stem>root>seed,and the order of Cd content in Solanum nigrum plants was:stem>fruit>root.The adsorption effect of rapeseed,Solanum nigrum and ramie on As in soil was poor.Rhodopseudomonas palustris and Aspergillus niger had little effect on the absorption of Cd and As in the soil by rapeseed,Solanum nigrum and ramie.Rapeseed was more suitable as a remediation plant for polluted soil by Cd.