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| Titel |
Soil Microbial Community Responses to Short-term Multiple Experimental Climate Change Drivers |
| VerfasserIn |
Guanlin Li, Jongyeol Lee, Sohye Lee, Yujin Roh, Yowhan Son |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130538
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| Publikation (Nr.) |
 EGU/EGU2016-10807.pdf |
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| Zusammenfassung |
| It is agreed that soil microbial communities are responsible for the cycling of carbon and
nutrients in ecosystems; however, the response of these microbial communities to
climate change has not been clearly understood. In this study, we measured the
direct and interactive effects of climate change drivers on soil bacterial and fungal
communities (abundance and composition) in an open-field multifactor climate change
experiment. The experimental treatment system was established with two-year-old Pinus
densiflora seedlings at Korea University in April 2013, and consisted of six different
treatments with three replicates: two levels of air temperature warming (control
and +3˚ C) were crossed with three levels of precipitation manipulation (control,
-30% and +30%). After 2.5 years of treatments, in August, 2015, soil samples were
collected from the topsoil (0-15cm) of all plots (n=18). High-throughput sequencing
technology was used to assess the abundance and composition of soil bacterial and
fungal community. Analysis of variance for a blocked split-plot design was used to
detect the effects of climate change drivers and their interaction on the abundance
and composition of soil bacterial and fungal community. Our results showed that
1) only the significant effect of warming on fungal community abundance was
observed (P <0.05); 2) on average, warming decreased both bacterial and fungal
community abundance by 20.90% and 32.30%, 6.69% and 45.89%, 14.71% and 19.56%
in control, decreased, and increased precipitation plots, respectively; 3) however,
warming increased the relative bacterium/fungus ratio on average by 14.03%, 37.03%
and 14.31% in control, decreased, and increased precipitation plots, respectively;
4) the phylogenetic distribution of bacterial and fungal groups and their relative
abundance varied among treatments; 5) treatments altered the relative abundance of
Ascomycota and Basidiomycota, where Ascomycota decreased with a concomitant
increase in the Basidiomycota across all treatments; and 6) the shift induced by
treatments in the dominant fungal group was larger than bacterial group. Since soil
microorganisms differ in their susceptibility to stressors, the changes in the soil
microbial communities may result from treatment-induced shifts in soil temperature and
moisture. Our results indicate that climate change drivers and their interactions
may cause changes in abundance and composition of soil microbial communities,
especially for the fungal community. These results illustrate climate change drivers and
their interactions may select for distinct soil microbial communities, and these
community changes may shape the way ecosystems function in the future. This study was
supported by National Research Foundation of Korea (NRF-2013R1A1A2012242). |
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