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PI-Submitted Research Highlights for
Terrestrial Ecosystem Science Program

Soil Microbiome in Arctic Polygonal Tundra Unlocked

Stan D. Wullschleger

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02 February 2017

Landscape topography structures the soil microbiome in Arctic polygonal tundra.

The Science
In the Arctic, environmental factors governing microbial degradation of soil carbon in active layer and permafrost are poorly understood. Here a team of scientists from the Next-Generation Ecosystem Experiments (NGEE)–Arctic project determined the functional potential of soil microbiomes horizontally and vertically across a cryoperturbed polygonal landscape in Barrow, Alaska.

The Impact
The role of ecosystem structure in microbial activity related to greenhouse gas production is poorly understood. Here, the scientists show that microbial communities and ecosystem function vary across fine-scale topography in an Arctic polygonal tundra.

Summary
With comparative metagenomics, genome binning of novel microbes, and gas flux measurements, a team of scientists from the NGEE-Arctic show that microbial greenhouse gas production is strongly correlated to landscape topography. While microbial functions such as fermentation and methanogenesis were dominant in wetter polygons, in drier polygons genes for carbon mineralization and methane (CH4) oxidation were abundant. The active layer microbiome was poised to assimilate nitrogen and not to release nitrous oxide (N2O), reflecting low N2O flux measurements. These results provide mechanistic links of microbial metabolism to greenhouse gas fluxes that are needed for the refinement of model predictions.

Contacts
BER Program Manager
Daniel Stover
Terrestrial Ecosystem Science, SC-23.1
Daniel.Stover@science.doe.gov

Principal Investigators
Neslihan Tas
Lawrence Berkeley National Laboratory
Berkeley, CA 94720
ntas@lbl.gov

LBNL POC: Susan Hubbard
Lawrence Berkeley National Laboratory
Berkeley, CA 94720
sshubbard@lbl.gov

Stan Wullschleger
Oak Ridge National Laboratory
Oak Ridge, TN 37831
wullschlegsd@ornl.gov

Funding
The Next-Generation Ecosystem Experiments (NGEE)–Arctic project is supported by the Office of Biological and Environmental Research within the U.S. Department of Energy (DOE) Office of Science. The DOE Joint Genome Institute, a DOE Office of Science user facility, is supported through Contract No. DE-AC0205CH11231 to Lawrence Berkeley National Laboratory.

Publications
Tas, Neslihan, Emmanuel Prestat, Shi Wang, Yuxin Wu, Craig Ulrich, Timothy Kneafsey, Susannah G. Tringe, Margaret S. Torn, Susan S. Hubbard & Janet K. Jansson. "Landscape topography structures the soil microbiome in arctic polygonal tundra." Nature Communications 9, 777 (2018). [DOI:10.1038/s41467-018-03089-z]

LBNL NGEE-Arctic

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