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Inoculating functional bacteria improved the humification process by regulating microbial networks and key genera in
Shijia Dong1, Yiyang Wei2, Qi Yu2
1Harbin University, Harbin 150086, China.
Bioresource Technology
|November 18, 2023
Summary
Adding a functional bacterial inoculant enhances straw composting by improving the degradation of lignocellulose and increasing humus formation, especially when combined with urea.
Area of Science:
- Agricultural Science
- Environmental Microbiology
- Soil Science
Background:
- Straw composting is a crucial process for waste management and nutrient recycling.
- Understanding the microbial dynamics and biochemical transformations during composting is essential for optimizing the process.
- Lignocellulose degradation and humus formation are key indicators of composting efficiency.
Purpose of the Study:
- To investigate the impact of a functional bacterial inoculant and various nitrogen sources on straw composting.
- To analyze the relationship between lignocellulose, humus precursors, and humus formation.
- To explore the interactions between the inoculant, nitrogen sources, and bacterial communities.
Main Methods:
- Composting experiments were conducted using straw with different nitrogen sources (urea, pig manure) and a functional inoculant.
- Lignocellulose degradation and humus formation were quantified.
- Bioinformatics and network analysis were used to study bacterial community structure and interactions.
Main Results:
- Inoculation improved the composting heating process and nitrate retention.
- Inoculation significantly increased lignocellulose degradation (26.9%-81.6%) and humus formation (15.7%-23.0%).
- Specific bacterial genera (Chryseolinea, Pusillimas, Luteimonas, Flavobacteria) were enriched and linked to humus formation.
- Inoculation and urea enhanced microbial synergy; pig manure with inoculant showed complex interactions.
Conclusions:
- Combining a functional bacterial inoculant with urea effectively enhances lignocellulose degradation and humification in straw composting.
- The inoculant positively influences microbial activity and community structure, promoting efficient composting.
- This approach offers a promising strategy for optimizing straw composting, particularly with single nitrogen sources.
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