Journal
FRONTIERS IN ECOLOGY AND EVOLUTION
Volume 10, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fevo.2022.1019494
Keywords
co-composting; copper; tetracycline hydrochloride; bacteria; fungi
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences
- Fundamental Research Funds in Heilongjiang Provincial Universities
- [XDA28080400]
- [135109227]
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This study analyzed the bacterial and fungal structures in Cu/TCH-amended composting and found that Cu and TCH had a significant impact on fungi but not on bacteria. TOC and TN were identified as the primary controls on microbial diversity, with NH4+-N and NO3--N being more beneficial to fungi.
There are a considerable number of discussions aimed at analyzing microbial communities and their functions during the composting process. However, microbial succession under copper (Cu) and tetracycline (TCH)-stressed conditions has received less attention. Thus, this work analyzed the bacterial and fungal structures with high-throughput sequencing in Cu/TCH-amended composting (Cu: 0, 100, and 500 mg/kg; TCH: 0, 50, and 300 mg/kg), and the dominating controls on microbial diversity were identified using redundancy analysis (RDA) and structural equation models (SEMs). Low-concentration Cu increased the peak temperature (57 degrees C) at the thermophilic phase. Composting phase-derived changes in bacterial and fungal communities were significant, while Cu and TCH showed a remarkable influence on fungi but not on bacteria. Cu and TCH inhibited Firmicutes' activity while promoting Actinobacteriota growth. Low-concentration Cu and TCH had a negative effect on Basidiomycota in the thermophilic phase and a positive influence on Chytridiomycota in the mature phase. TOC and TN were primary controls on the changes in microbial communities. NH4+-N and NO3--N were more beneficial to fungi with a contribution proportion of 42.13 and 16.85%, respectively. These findings could provide theoretical guidance for the directional research on microbial inoculants.
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