Distinct Taxonomic and Functional Profiles of the Microbiome Associated With Different Soil Horizons of a Moist Tussock Tundra in Alaska
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- 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
- Binu, M.
Jung, Ji Young
Ju, Hyeon Tae
Lee, Yoo Kyung
- microbiome; 메타지노믹스; 북극 툰드라; 영구동토층
- Issue Date
- 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.
- 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.
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