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Succession of the functional microbial communities and the metabolic functions in maize straw composting process

Wei, Huawei, Wang, Liuhong, Hassan, Muhammad, Xie, Bing
Bioresource technology 2018 v.256 pp. 333-341
Bacteroidetes, Cellulosimicrobium, Ochrobactrum, Staphylococcus, bacterial communities, biochemical pathways, carbon nitrogen ratio, community structure, composting, corn straw, humic acids, humus, information processing, metabolism, phosphorus, phylogeny
Illumina MiSeq sequencing and phylogenetic investigation of communities by reconstruction of unobserved states (PICRUSt) were applied to study the dynamic changes and effects of microbial community structures as well as the metabolic function of bacterial community in maize straw composting process. Results showed that humic acid contents in loosely combined humus (HA1) and stably combined humus (HA2) increased after composting and Staphylococcus, Cellulosimicrobium and Ochrobactrum possibly participated in the transformation of the process. The bacterial communities differed in different stages of the composting. Firmicutes, Proteobacteria, Bacteroidetes and Actinobacteria were reported the dominant phyla throughout the process and the relative abundance of the dominant phyla varied significantly (p < 0.05) over time. Moreover, the total phosphorus (TP) had the greatest influence on the microbial community structure among C/N ratio, available phosphorus (AP) and humic substances. Metabolism, cellular processes and environmental information processing might be the primary functions of microbial community during the composting.