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Distinct depth profile of bacterial and archaeal communities between four Alaskan soil cores

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Title
Distinct depth profile of bacterial and archaeal communities between four Alaskan soil cores
Other Titles
알래스카 동토 깊이에 따른 세균 및 고세균 군집구조 차이 연구
Authors
Kim, Mincheol
Lee, Yoo Kyung
Yang, Ji-Woong
Ahn, Jinho
Kim, Yongwon
Byun, Eunji
Keywords
동토; 미생물; 알래스카
Issue Date
2016
Citation
Kim, Mincheol, et al. 2016. Distinct depth profile of bacterial and archaeal communities between four Alaskan soil cores. 11th International Conference on Permafrost (ICOP 2016). 포츠담. 2016.06.20~2016.06.24.
Abstract
Microbial response to permafrost thaw driven by climate warming varies by sites. Although a great deal of environmental heterogeneity is found across permafrost regions, vertical variation of microbial communities in permafrost affected soils is not well understood. Here, we sampled soil cores at four different sites including both continuous and discontinuous permafrost regions in Alaska. Abundance and community structure of soil bacteria and archaea were compared between cores at different depths using MiSeq sequencing and quantitative PCR targeting 16S rRNA gene. Abundance of bacteria and archaea overall changed in a similar way but did not show any directional pattern across depth. Both bacteria and archaeal communities were primarily structured by site difference, followed by depth and soil chemical properties. Interestingly, there were dramatic shifts in bacterial phyla dominance around permafrost table in two permafrost affected soils. Relative abundance of Chloroflexi was reduced to a great extent, while Caldiserica and Firmicutes markedly increased below 58 cm depth in a tussock tundra site. In a Sphagnum-dominated bog site, Verrcomicrobia and Planctomycetes almost disappeared, while Chloroflexi and candidate phylum AD3 dominated below 72 cm depth. These site-specific vertical variations of microbial community structure will be an important resource to predict how soil microbes respond to permafrost thaw.
URI
http://repository.kopri.re.kr/handle/201206/7166
Conference Name
11th International Conference on Permafrost (ICOP 2016)
Conference Place
포츠담
Conference Date
2016.06.20~2016.06.24
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