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| Soil cadmium content and microbial community structure are affected by passivator application |
| Received:June 07, 2020 |
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| KeyWord:cadmium pollution;passivator;ecological risk;microbial communities |
| Author Name | Affiliation | E-mail | | LAN Yu-shu | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | YUAN Lin | Sichuan Academy of Environmental Sciences, Chengdu 610041, China | | | YANG Gang | Institute of Ecological Environment, Sichuan Agricultural University, Chengdu 611130, China | yg8813@163.com | | CHENG Rong | Institute of Comprehensive Utilization of Mineral Resources, China Academy of Geosciences, Chengdu 610041, China | | | SHI Gu-qi | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | | GAO Ben-han | College of Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| To investigate the effects of passivators on soil cadmium content and soil microbial community structure, field experiments were conducted in which passivators(sepiolite, lime, straw biochar, and chelate iron fertilizer)were applied to lightly Cd-contaminated rice fields. The results showed that passivator application increased soil pH by 0.17~1.29 units and decreased the extractable state of Cd by 29.79%~64.48%. The application of sepiolite, lime, and straw biochar increased microbial community diversity(ACE, Chao1, Shannon); however, chelated iron fertilizer application was not conducive to microbial community growth and led to decreased microbial diversity. The relative abundances of Proteobacteria, Firmicutes, and Bacteroidetes increased when passivators were applied, while the relative abundances of Gemmatimonadetes, Chloroflexi, and Saccharibacteria decreased. Correlation analysis showed that pH and Cd were the key factors affecting the microbial community; additionally, Cd morphology had an impact on the microbial community. Studies have shown that the application of a passivating agent can reduce the potential ecological risks posed by Cd in soils, change the structure of the soil microbial community, and inhibit or enhance the growth of many microbial communities. |
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