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首页> 外文OA文献 >Effects of Bacillus thuringiensis HC-2 Combined with Biochar on the Growth and Cd and Pb Accumulation of Radish in a Heavy Metal-Contaminated Farmland under Field Conditions
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Effects of Bacillus thuringiensis HC-2 Combined with Biochar on the Growth and Cd and Pb Accumulation of Radish in a Heavy Metal-Contaminated Farmland under Field Conditions

机译：Bacillus HC-2与Biochar联合生物炭对田间条件下重金属污染农田萝卜生长和Cd和Pb积累的影响

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The objective of this study was to explore the effect of heavy metal-resistant bacteria and biochar (BC) on reducing heavy metal accumulation in vegetables and the underlying mechanism. We tested Bacillus thuringiensis HC-2, BC, and BC+HC-2 for their ability to immobilize Cd and Pb in culture solution. We also studied the effects of these treatments on the dry weight and Cd and Pb uptake of radish in metal-contaminated soils under field conditions and the underlying mechanism. Treatment with HC-2, BC, and BC+HC-2 significantly reduced the water-soluble Cd (34–56%) and Pb (31–54%) concentrations and increased the pH and NH4+ concentration in solution compared with their vales in a control. These treatments significantly increased the dry weight of radish roots (18.4–22.8%) and leaves (37.8–39.9%) and decreased Cd (28–94%) and Pb (22–63%) content in the radish roots compared with the control. Treatment with HC-2, BC, and BC+HC-2 also significantly increased the pH, organic matter content, NH4+ content, and NH4+/NO3− ratio of rhizosphere soils, and decreased the DTPA-extractable Cd (37–58%) and Pb (26–42%) contents in rhizosphere soils of radish. Furthermore, BC+HC-2 had higher ability than the other two treatments to protect radish against Cd and Pb toxicity and increased radish biomass. Therefore, Bacillus thuringiensis HC-2 combined with biochar can ensure vegetable safety in situ for the bioremediation of heavy metal-polluted farmland.
机译：本研究的目的是探讨重金属细菌和生物炭（BC）对蔬菜和潜在机制的重金属积累的影响。我们测试了Bacillus thuringiensis HC-2，BC和BC + HC-2，以便它们在培养溶液中固定CD和Pb的能力。我们还研究了这些治疗对现场条件下金属污染土壤中萝卜的干重和Cd和Pb的影响。用HC-2，BC和BC + HC-2处理显着降低水溶性Cd（34-56％）和Pb（31-54％）浓度，并与其vales相比，溶液中的pH和NH 4 +浓度增加控制。这些治疗显着增加了萝卜根的干重（18.4-22.8％），与对照相比，萝卜根中的叶子（37.8-39.9％）和降低（28-94％）和Pb（22-63％）含量（28-94％）和Pb（22-63％）含量。用HC-2，BC和BC + HC-2处理也显着增加了根际土壤的pH，有机物质含量，NH4 +含量和NH4 + / NO3比，并降低了DTPA可提取的CD（37-58％）萝卜根际土壤中的PB（26-42％）含量。此外，BC + HC-2的能力高于其他两个治疗方法，以保护萝卜免受CD和PB毒性和萝卜生物质增加。因此，Bacillus thuringiensis HC-2与Biochar联合可以确保植物安全原位为重金属污染的农田生物修复。

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