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Distinct Taxonomic and Functional Profiles of the Microbiome Associated With Different Soil Horizons of a Moist Tussock Tundra in Alaska

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Title
Distinct Taxonomic and Functional Profiles of the Microbiome Associated With Different Soil Horizons of a Moist Tussock Tundra in Alaska
Other Titles
알래스카 툰드라 지역에서의 토양 층위에 따라 구별되는 미생물 특성 연구
Authors
Binu, M.
김혜민
Jung, Ji Young
Nam, Sungjin
Ju, Hyeon Tae
Kim, Mincheol
Lee, Yoo Kyung
Keywords
microbiome; 메타지노믹스; 북극 툰드라; 영구동토층
Issue Date
2019
Citation
Binu, M., et al. 2019. "Distinct Taxonomic and Functional Profiles of the Microbiome Associated With Different Soil Horizons of a Moist Tussock Tundra in Alaska". FRONTIERS IN MICROBIOLOGY, 10(1): 1442-1446.
Abstract
Permafrost-underlain tundra soils in Northern Hemisphere are one of the largest reservoirs of terrestrial carbon, which are highly sensitive to microbial decomposition due to climate warming. However, knowledge about the taxonomy and functions of microbiome residing in different horizons of permafrost-underlain tundra soils is still limited. Here we compared the taxonomic and functional composition of microbiome between different horizons of soil cores from a moist tussock tundra ecosystem in Council, Alaska, using 16S rRNA gene and shotgun metagenomic sequencing. The composition, diversity and functions of microbiome varied significantly between soil horizons, with top soil horizon harbored more diverse communities than sub-soil horizons. The vertical gradient in soil physico-chemical parameters were strongly associated with composition of microbial communities across permafrost soil horizons; however, a large fraction of the variation in microbial communities remained unexplained. The genes associated with carbon mineralization were more abundant in top soil horizon, while genes involved in acetogenesis, fermentation, methane metabolism (methanogenesis and methanotrophy) and N cycling were dominant in sub-soil horizons. The results of phylogenetic null modeling analysis showed that stochastic processes strongly influenced the composition of the microbiome in different soil horizons, except the bacterial community composition in top soil horizon, which was largely governed by homogeneous selection. Our study expands the knowledge on the structure and functional potential of microbiome associated with different horizons of permafrost soil, which could be useful in understanding the effects of environmental change on microbial responses in tundra ecosystems.
URI
http://repository.kopri.re.kr/handle/201206/10009
DOI
http://dx.doi.org/10.3389/fmicb.2019.01442
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