U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights


Soil Microbiome in Arctic Polygonal Tundra Unlocked
Published: February 22, 2018
Posted: March 07, 2018

Landscape topography structures the soil microbiome in Arctic polygonal tundra.

The Science
In the Arctic, environmental factors governing microbial degradation of soil carbon (C) in active layer and permafrost are poorly understood. Here a team of scientists from NGEE-Arctic 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, they 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 Next Generation Ecosystem Experiment (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 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.

Contacts (BER PM)
Daniel Stover
SC-23.1
Daniel.Stover@science.doe.gov

(PI Contact)
Author: Neslihan Tas
Lawrence Berkeley National Laboratory
ntas@lbl.gov

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

PI: Stan Wullschleger
Oak Ridge National Laboratory
wullschlegsd@ornl.govĀ 

Funding
The Next-Generation Ecosystem Experiments (NGEE Arctic) project is supported by the Office of Biological and Environmental Research in the DOE Office of Science. The Department of Energy Joint Genome Institute, a DOE Office of Science User Facility, is supported through contract number 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, article 777 (2018). [DOI:10.1038/s41467-018-03089-z]

Topic Areas:

  • Research Area: DOE Joint Genome Institute (JGI)
  • Research Area: Next-Generation Ecosystem Experiments (NGEE)

Division: SC-23.1 Climate and Environmental Sciences Division, BER

 

BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

Aug 24, 2019
New Approach for Studying How Microbes Influence Their Environment
A diverse group of scientists suggests a common framework and targeting of known microbial processes [more...]

Aug 08, 2019
Nutrient-Hungry Peatland Microbes Reduce Carbon Loss Under Warmer Conditions
Enzyme production in peatlands reduces carbon lost to respiration under future high temperatures. [more...]

Aug 05, 2019
Amazon Forest Response to CO2 Fertilization Dependent on Plant Phosphorus Acquisition
AmazonFACE Model Intercomparison. The Science Plant growth is dependent on the availabi [more...]

Jul 29, 2019
A Slippery Slope: Soil Carbon Destabilization
Carbon gain or loss depends on the balance between competing biological, chemical, and physical reac [more...]

Jul 15, 2019
Field Evaluation of Gas Analyzers for Measuring Ecosystem Fluxes
How gas analyzer type and correction method impact measured fluxes. The Science A side- [more...]

List all highlights (possible long download time)