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标题：Soil biofilm formation enhances microbial community diversity and metabolic activity
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作者：Yichao Wu ; Peng Cai ; Xinxin Jing 等
期刊名称：Environment International
印刷版ISSN：0160-4120
电子版ISSN：1873-6750
出版年度：2019
卷号：132
页码：1-8
DOI：10.1016/j.envint.2019.105116
语种：English
出版社：Pergamon
摘要：AbstractBiofilms have been extensively studied in aquatic and clinical environments. However, the complexity of edaphic microenvironment hinders the advances toward understanding the environmental functionalities and ecological roles of soil biofilms. In this work, artificial soil was employed to investigate the soil biofilm formation and corresponding impacts on community structure and microbial activities. Our results showed that extracellular polymeric substances (EPS) production was significantly enhanced and micro-meter sized cell aggregates formed with high glucose amendment. Biofilm development exhibited significant effects on the soil microbial processes. 16S rRNA gene sequencing demonstrated the soils with biofilms and free-living cells shared similar microbial communities. But the Shannon diversity and evenness indices of communities with soil biofilms were significantly enhanced by 18.2% and 17.1%. The soil with biofilms also revealed a rapid response to nutrient provision and robust microbial activity, which consumed 65.4% more oxygen in the topsoil (0–1.5 mm). Kinetic respiration analysis showed that the enhanced metabolic activity was attributed to 23-times more active microbes in soil biofilms. In summary, this study revealed that soil biofilms can sustain a diverse and robust community to drive soil biogeochemical processes.Graphical abstractDisplay OmittedHighlights•High nutrient supply induced less microbial biomass growth, enhanced EPS production and soil biofilm formation.•The microbial diversity and evenness of soil with biofilms was significantly higher than that with free-living cells.•The soil with biofilms revealed an elevated microbial respiration rate and a rapid response to nutrient amendment.•Soil biofilm sustained 40-times more active microbes than that with free-living cells.
关键词：Soil biofilms;Nutrient availability;Microbial biomass;Microbial community;Heterotrophic respiration;Microbial activity