Organic Carbon Amendments Affect the Chemodiversity of Soil Dissolved Organic Matter and Its Associations with Soil Microbial Communities

The “4 per mil” initiative recognizes the pivotal role of soil in carbon resequestration. The need for evidence to substantiate the influence of agricultural practices on chemical nature of soil carbon and microbial biodiversity has become a priority. However, owing to the molecular complexity of so...

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Bibliographic Details
Published in:Environmental science & technology 2019-01, Vol.53 (1), p.50-59
Main Authors: Li, Xiao-Ming, Chen, Qing-Lin, He, Chen, Shi, Quan, Chen, Song-Can, Reid, Brian J, Zhu, Yong-Guan, Sun, Guo-Xin
Format: Article
Language:English
Subjects:
Agricultural practices
Agrochemicals
Biodiversity
Carbon
Carbon cycle
Chemical reactions
Chemical synthesis
Communities
Community composition
Complexity
Dissolved organic matter
Eutrophication
Fertilization
Linkages
Microbial activity
Microorganisms
Network analysis
Organic carbon
Organic chemistry
Organic soils
Soil analysis
Soil chemistry
Soil microorganisms
Soils
Synthesis gas
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Summary:The “4 per mil” initiative recognizes the pivotal role of soil in carbon resequestration. The need for evidence to substantiate the influence of agricultural practices on chemical nature of soil carbon and microbial biodiversity has become a priority. However, owing to the molecular complexity of soil dissolved organic matter (DOM), specific linkages to microbial biodiversity have eluded researchers. Here, we characterized the chemodiversity of soil DOM, assessed the variation of soil bacterial community composition (BCC), and identified specific linkages between DOM traits and BCC. Sustained organic carbon amendment significantly (P < 0.05) increased total organic matter reservoirs, resulted in higher chemodiversity of DOM and emergence of recalcitrant moieties (H/C < 1.5). In the meantime, sustained organic carbon amendment shaped the BCC to a more eutrophic state while long-term chemical fertilization directed the BCC toward an oligotrophic state. Meanwhile, higher connectivity and complexity were observed in organic carbon amendment by DOM–BCC network analysis, indicating that soil microbes tended to have more interaction with DOM molecules after organic matter inputs. These results highlight the potential for organic carbon amendments to not only build soil carbon stocks and increase their resilience but also mediate the functional state of soil bacterial communities.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.8b04673