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Emma L. Aronson Allison lab UC Irvine May 17, 2012

Impact of varied precipitation and N deposition on grassland soil microbial communities and GHG flux. Emma L. Aronson Allison lab UC Irvine May 17, 2012. Precipitation hypotheses. Control. Increased Rainfall. Decreased Rainfall.

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Emma L. Aronson Allison lab UC Irvine May 17, 2012

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  1. Impact of varied precipitation and N deposition on grassland soil microbial communities and GHG flux Emma L. Aronson Allison lab UC Irvine May 17, 2012

  2. Precipitation hypotheses Control Increased Rainfall Decreased Rainfall Indicates rate of CO2 and N2O release, CH4 consumption Indicates level of soil bacterial biodiversity

  3. N amendment hypotheses N Added Control N N N N N N Indicates rate of CO2 and N2O release, CH4 consumption Indicates level of soil bacterial biodiversity

  4. In March, N and H2O- increased CH4 uptake production uptake

  5. H2O- increased CH4 uptake production uptake

  6. N increased CH4 uptake production uptake

  7. Rain decreased, then increased uptake production uptake

  8. CH4 flux correlates with initial [CH4] 80 60 40 20 0 -20 -40 -60 -80 production CH4 Flux (ppb min-1) 500 1000 1500 2000 2500 3000 3500 uptake

  9. H2O- decreased respiration

  10. Time interacts with precipitation

  11. Time interacts with precipitation

  12. Rainfall increases respiration CO2 Flux Precipitation CO2 Flux (mg m-2 h-1) Precipitation (in d-1) Day of Study Courtesy of Greg Winston

  13. N increases N2O release

  14. Time interacts with N treatment

  15. Time interacts with N treatment

  16. Rain Effect?

  17. Drought changed bacterial community Significantly Different Phyla Ambient Rainfall Reduced Rainfall

  18. Reduced rainfall decreases variability in microbial richness at OTU level

  19. Drought decreased respiration and variability in bacterial diversity, increased CH4 uptake Control Increased Rainfall Decreased Rainfall Indicates rate of CO2 release, CH4 consumption microbial community variability

  20. N amendment increased N2O release, CH4 uptake N Added Control N N N N N N Indicates rate of N2O release, CH4 consumption

  21. Research in progress • Further 16S 454 sequencing • for all dates of gas analysis • Shotgun metagenomic DNA sequencing • GeoChip functional microarrays or qPCR • Gene expression of soil N and C cycling functions

  22. Questions?

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