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| Remediation of cadmium contamination in soil by Althaea rosea-Bacillus mucilaginosus |
| Received:November 28, 2019 |
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| KeyWord:Althaea rosea;Bacillus mucilaginosus;cadmium;soil remediation |
| Author Name | Affiliation | E-mail | | ZHAO Yin | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | LONG Yue | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | PAN Yuan-zhi | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | scpyzls@163.com | | GOU Jing | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | WU Qian-li | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | ZHOU Jiao | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | WU Meng-xi | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | LIU Shi-liang | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| The aim of the study was to explore the effect of Bacillus mucilaginosus on the ability of Althaea rosea to remediate Cd contamination in soil. A pot experiment was conducted to study the effects of Bacillus mucilaginosus on biomass, Cd accumulation, available Cd content in rhizosphere soil, and enzyme activities in rhizosphere soil under 25 mg·kg-1 Cd stress. The results indicated that compared to treatment with Cd alone, under 25 mg·kg-1 Cd stress, application of 6 g·kg-1 B. mucilaginosus could significantly increase root and stem biomass (P<0.05)and increased total biomass by 33.6%~73.2%. Cd accumulation in A. rosea was 1.64, 2.89, and 1.69 times higher than that with Cd treatment alone when applied with 3, 6, and 9 g·kg-1 B. mucilaginosus, respectively. Available Cd content in rhizosphere soil increased significantly after application of different concentrations of bacterial fertilizer (P<0.05). The activity of urease, invertase, and dehydrogenase in rhizosphere soil of A. rosea was significantly increased by application of bacterial fertilizer (P<0.05); however, the activity of polyphenol oxidase continued to decrease and changed significantly (P<0.05). The results showed that the application of B. mucilaginosus under 25 mg·kg-1 Cd treatment could effectively improve the ability of A. rosea to remediate soil Cd pollution, and the best concentration of bacterial fertilizer was 6 g·kg-1. Remediation of Cd contamination in soil by Althaea rosea-Bacillus mucilaginosus has application potential. |
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