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| Remediation effect of compound bacteria and chicken manure-derived biochar in nickel- and cadmium-contaminated soil |
| Received:December 27, 2021 |
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| KeyWord:nickel;cadmium;soil remediation;multifunctional microorganism;biochar;microbial community |
| Author Name | Affiliation | E-mail | | YANG Yi | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | CHEN Yuanhui | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | ZHANG Chunyan | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | ZHANG Yu | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | LI Mingtang | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | limtdoc2008@163.com |
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| Abstract: |
| Microorganisms and biochar may achieve synergistic low-carbon, green remediation of heavy metal-contaminated soils, but there has been little research on this topic. In the present study, a corn pot experiment was performed to evaluate the remediation of nickel (Ni)- and cadmium(Cd)-contaminated soil by multifunctional compound bacteria and chicken manure-derived biochar. In both single and combined remediation experiments, compound bacteria and biochar with different particle sizes immobilized Ni and Cd in the soil to varying degrees, reduced the uptake of Ni and Cd in maize seedlings, and increased the structural richness and species diversity of bacteria and fungi in rhizosphere soil. The most efficient remediation effect was attributed to the combination of compound bacteria and micronscale biochar with a smaller particle size(1.6~55.8 μm). Using this remediation strategy, the amount of available Ni and Cd decreased by 66.5% and 53.8%, respectively, and the amount of carbonate-bound Ni and Cd increased by 59.9% and 68.4%, respectively, in rhizosphere soil. Moreover, combined remediation with compound bacteria and micron-scale biochar resulted in improved growth performance and increased antioxidant capacity of potted maize seedlings. The Ni and Cd content in maize roots decreased by 49.3% and 41.9%, respectively, and the Ni and Cd content of the aboveground parts of the plants decreased by 69.4% and 53.0%, respectively, after combined remediation. Combined remediation with compound bacteria and micron-scale biochar also increased biological activity in rhizosphere soil, as indicated by an increased number of operational taxonomic units of bacteria and fungi, improved richness and diversity of the dominant microbial flora, and improved microbial community structure. These results show that multifunctional microorganisms and biochar have synergistic remediation effect, and provide the theoretical basis and technical support for the combined remediation of heavy metal-contaminated soil. |
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