Landscape topography structures the soil microbiome in arctic polygonal tundra

Nature Communications
Neslihan TaşJanet K Jansson

Abstract

In the Arctic, environmental factors governing microbial degradation of soil carbon (C) in active layer and permafrost are poorly understood. Here we determined the functional potential of soil microbiomes horizontally and vertically across a cryoperturbed polygonal landscape in Alaska. With comparative metagenomics, genome binning of novel microbes, and gas flux measurements we show that microbial greenhouse gas (GHG) production is strongly correlated to landscape topography. Active layer and permafrost harbor contrasting microbiomes, with increasing amounts of Actinobacteria correlating with decreasing soil C in permafrost. While microbial functions such as fermentation and methanogenesis were dominant in wetter polygons, in drier polygons genes for C mineralization and CH4 oxidation were abundant. The active layer microbiome was poised to assimilate N and not to release N2O, reflecting low N2O flux measurements. These results provide mechanistic links of microbial metabolism to GHG fluxes that are needed for the refinement of model predictions.

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Citations

Apr 30, 2019·FEMS Microbiology Ecology·Ianina AltshulerLyle G Whyte
Jan 10, 2019·FEMS Microbiology Ecology·Petr Baldrian
May 17, 2019·Nature Reviews. Microbiology·David A HutchinsPankaj Trivedi
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Sep 29, 2020·Frontiers in Microbiology·Ryan McClureJanet K Jansson
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Nov 16, 2019·The Science of the Total Environment·Yu-Rong LiuQiaoyun Huang
May 21, 2021·The ISME Journal·Adrian GoreckiFabian Horn
Jul 4, 2021·Global Change Biology·Min Jung KwonMincheol Kim
Aug 5, 2021·Applied and Environmental Microbiology·Madison M DouglasWoodward W Fischer

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Datasets Mentioned

BETA
1019880

Methods Mentioned

BETA
PCA
amplicon sequencing

Software Mentioned

Maxbin
Adonis
ade4
QIIME
R
AMPHORA2
FastTree
MEGAHIT
vegan
UPARSE

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