Abstract
To explore how C/N ratio-induced changes in the predominant microbial succession in the composting microbiota affect C and N losses, and promote the formation of humic substance, a composting experiment was conducted with C/N ratio of 20:1, 25:1 and 30:1. Results showed that N and C losses under 30:1 and 25:1 treatments were 33.5%, 18.9% and 23.6%, 10.8% lower than those of the treatment of 20:1, respectively. Redundancy analysis results suggested that higher C/N ratio promoted nitrogen fixing bacteria, while inhibited the proliferation of denitrifying bacte-ria, resulting in reduction of the losses of C and N during composting. Higher C/N ratio significantly promoted the growth and reproduction of lignocellulose degrading bacteria for the degradation of fulvic acid and humin to form more humic acid, and improved the polymerization of humic substance. Therefore, C/N ratio could significantly affect key microbes during composting, with consequences on the process and quality. It could be an effective way to regulate C and N losses, promote HS formation, and eventually improve the compost quality and reduce the secondary environmental pollution during composting.
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Schedule a callMore From: Ying yong sheng tai xue bao = The journal of applied ecology
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