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Title: Elevated carbon dioxide accelerates the spatial turnover of soil microbial communities

Although elevated CO2 (eCO2) significantly affects the -diversity, composition, function, interaction and dynamics of soil microbial communities at the local scale, little is known about eCO2 impacts on the geographic distribution of micro-organisms regionally or globally. Here, we examined the -diversity of 110 soil microbial communities across six free air CO2 enrichment (FACE) experimental sites using a high-throughput functional gene array. The -diversity of soil microbial communities was significantly (P<0.05) correlated with geographic distance under both CO2 conditions, but declined significantly (P<0.05) faster at eCO2 with a slope of -0.0250 than at ambient CO2 (aCO2) with a slope of -0.0231 although it varied within each individual site, indicating that the spatial turnover rate of soil microbial communities was accelerated under eCO2 at a larger geographic scale (e.g. regionally). Both distance and soil properties significantly (P<0.05) contributed to the observed microbial -diversity. Furthermore, this study provides new hypotheses for further understanding their assembly mechanisms that may be especially important as global CO2 continues to increase.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Oklahoma, Norman, OK (United States)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Univ. of Oklahoma, Norman, OK (United States); Ningbo Univ. Ningbo (China)
  4. Chinese Academy of Sciences (CAS), Beijing (China); Harbin Institute of Technology, Harbin (China); Liaoning Technical Univ., Fuxin (China)
  5. Univ. of Oklahoma, Norman, OK (United States); Guangdong Institute of Microbiology, Guangzhou (China)
  6. The Univ. of Minnesota, St. Paul, MN (United States)
  7. The Univ. of Minnesota, St. Paul, MN (United States); Univ. of Western Sydney, Richmond, NSW (Australia)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  10. Univ. of Wyoming, Laramie WY (United States)
  11. Colorado State Univ., Fort Collins, CO (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Global Change Biology
Additional Journal Information:
Journal Volume: 22; Journal Issue: 2; Journal ID: ISSN 1354-1013
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
59 BASIC BIOLOGICAL SCIENCES elevated carbon dioxide; free air CO2 enrichment; microbial community; spatial turnover rate; β-diversity