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| Influences of Microbial Inoculation on Pb and Cd Tolerance of Rudbeckia Hirta and the Combined Remediation Effect |
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Received:March 12, 2023
Revised:March 18, 2023
Accepted:March 24, 2023
Published Online:June 16, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.07.015 |
| KeyWord:Pb and Cd contaminated soil; microbes; Rudbeckia hirta; combination remediation |
| Author | Institution |
| HE Yuan-dong |
1.贵州师范大学 地理与环境科学学院（喀斯特研究院） 2.贵州省喀斯特山地生态环境国家重点实验室培育基地 |
| ZHANG Ling-yun |
1.贵州师范大学 地理与环境科学学院（喀斯特研究院） 2.贵州省喀斯特山地生态环境国家重点实验室培育基地 |
| SUN Nan |
1.贵州师范大学 地理与环境科学学院（喀斯特研究院） 2.贵州省喀斯特山地生态环境国家重点实验室培育基地 |
| DU Yue |
1.贵州师范大学 地理与环境科学学院（喀斯特研究院） 2.贵州省喀斯特山地生态环境国家重点实验室培育基地 |
| DONG Ying-ping |
1.贵州师范大学 地理与环境科学学院（喀斯特研究院）2.国家喀斯特石漠化防治工程技术研究中心 |
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| Abstract: |
| The indoor pot experiment was carried out to study the influence of single and double inoculation of Purpureocillium lilacinum（PL）, Paecilomyces sp（PS） and Stenotrophomonas maltophilia（SM） on the tolerance of Rudbeckia hirta (R.hirta) and its combined remediation effect by adding different concentrations of Pb and Cd mixed pollution. The results show that inoculation of microorganisms could effectively alleviate the toxicity of Pb and Cd co-contaminated soil to R.hirta. The biomass of R.hirta rises by 73.1%—207.31% after inoculation of PL and PS, which has the best tolerant ability. The enrichment coefficient and transport coefficient of Pb and Cd of the other five inoculation methods were greater than 1 except for double inoculation of PL and SM, and the enrichment ability of Pb and Cd of the other five inoculation methods is better than that of single inoculation. After inoculation of microorganisms, the content of available Pb and Cd in soil rises by 8.91%—702.22% and 0.13%—23.26% respectively. Under the concentration of Pb 1 500 mg/kg and Cd 1 mg/kg in soil, the combined repair of R.hirta and microorganism has a good effect, which is conducive to the activation of Pb and Cd in soil, and the combination of PL and PS has better inoculation effect. |
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