Investigating the variation of dissolved organic matters and the evolution of autotrophic microbial community in composting with organic and inorganic carbon sources

[Display omitted] •Adding SM or NC promoted the transformation of OM and DOM.•NC amendment increased the abundance of cbbL gene based on qPCR analysis.•Both SM and NC improved the diversity of CCAM community.•CCAM growth was positively correlated with C/N, TN, pH, OM and DOM via db-RDA and Pearson a...

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Bibliographic Details
Published in:Bioresource technology 2020-05, Vol.304, p.123013-123013, Article 123013
Main Authors: Zhu, Qiuhui, Li, Gen, Jiang, Zhiwei, Li, Mingqi, Ma, Chaofan, Li, Xintian, Li, Qunliang
Format: Article
Language:English
Subjects:
Carbon
Carbon Cycle
cbbL-containing autotrophic microbes (CCAM)
Composting
Dissolved organic matter (DOM)
Microbiota
Na2CO3 (NC)
Soil
Sugarcane molasses (SM)
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Summary:[Display omitted] •Adding SM or NC promoted the transformation of OM and DOM.•NC amendment increased the abundance of cbbL gene based on qPCR analysis.•Both SM and NC improved the diversity of CCAM community.•CCAM growth was positively correlated with C/N, TN, pH, OM and DOM via db-RDA and Pearson analysis. The main purpose of this study was to analyze the effects of different carbon source (Na2CO3, NC; sugarcane molasses, SM) additives on dissolved organic matter (DOM), cbbL-containing autotrophic microbes (CCAM), and the relationship among physico-chemical parameters, DOM and CCAM to better understand carbon transformation in composting. The results showed that SM or NC additive could promote the degradation and transformation of OM and DOM. After adding SM or NC, the Simpson index decreased by 2.03% and 0.51%, respectively, and Luteimonas and Thermomonspora were detected using high throughput sequencing, indicating that SM and NC increased the diversity of CCAM community. Additionally, both NC and SM contributed to improve the abundance of cbbL gene (45.91% and 2.15%) based on fluorescence quantitative PCR (qPCR) analysis at the cooling phase of composting. Pearson correlation analysis revealed that Proteoobacteria, Firmicutes, Acidobacteria and Nematoda were positively related with C/N, OM and DOM (0.5 
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2020.123013