Journal
BIORESOURCE TECHNOLOGY
Volume 303, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.122868
Keywords
Bacillus subtilis; Carbon; Composting; Functional metabolism; Redundancy analysis
Funding
- National Natural Science Foundation of China [41807131, 41977007, 41830754]
- China Postdoctoral Science Foundation [2019M653707]
- Natural Science Foundation of Shaanxi province of China [2019JQ-537]
- Research project of State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China [2019KJCXTD-4, QJNY-2019-01]
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This study is the first to investigate the changes in the composting process and carbon conversion in a cow manure-straw compost matrix with Bacillus subtilis added at four different levels (0, 0.5%, 1%, and 2% w/w compost), and to explain the mechanism responsible for carbon conversion through microbial functional metabolism. Inoculation with Bacillus subtilis at 2% had the best effect on fermentation among all treatments, but it inhibited the synthesis of total organic carbon and humus. Bacillus subtilis at 0.5% reduced mineralization in the cooling and maturity stages of composting, and enhanced the humification of carbon. The total organic carbon and humic sequence contents were significantly higher with Bacillus subtilis at 0.5% (12.5% and 20.2%, respectively) than Bacillus subtilis at 2% (P < 0.05). Redundancy analysis demonstrated that the pH and microbial functional metabolism were closely related to carbon sequestration during composting.
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