Soil metabolome response to whole-ecosystem warming at the Spruce and Peatland Responses under Changing Environments experiment.

Autor: Wilson RM; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL 32306., Tfaily MM; Department of Environmental Science, University of Arizona, Tucson, AZ 85705.; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352., Kolton M; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332-0230., Johnston ER; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830., Petro C; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332-0230., Zalman CA; Schmid College of Science and Technology, Biological Sciences, Chapman University, Orange, CA 92866., Hanson PJ; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830., Heyman HM; Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352., Kyle JE; Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352., Hoyt DW; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352., Eder EK; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352., Purvine SO; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352., Kolka RK; Northern Research Station, US Department of Agriculture Forest Service, Grand Rapids, MN 55730., Sebestyen SD; Northern Research Station, US Department of Agriculture Forest Service, Grand Rapids, MN 55730., Griffiths NA; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830., Schadt CW; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830., Keller JK; Schmid College of Science and Technology, Biological Sciences, Chapman University, Orange, CA 92866., Bridgham SD; Institute of Ecology and Evolution, University of Oregon, Eugene, OR 97402., Chanton JP; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL 32306., Kostka JE; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA 30332-0230; joel.kostka@biology.gatech.edu.; School of Earth & Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332-0340.; Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, GA 30332-0230.
Jazyk: angličtina
Zdroj: Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2021 Jun 22; Vol. 118 (25).
DOI: 10.1073/pnas.2004192118
Abstrakt: In this study, a suite of complementary environmental geochemical analyses, including NMR and gas chromatography-mass spectrometry (GC-MS) analyses of central metabolites, Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) of secondary metabolites, and lipidomics, was used to investigate the influence of organic matter (OM) quality on the heterotrophic microbial mechanisms controlling peatland CO 2 , CH 4 , and CO 2 :CH 4 porewater production ratios in response to climate warming. Our investigations leverage the Spruce and Peatland Responses under Changing Environments (SPRUCE) experiment, where air and peat warming were combined in a whole-ecosystem warming treatment. We hypothesized that warming would enhance the production of plant-derived metabolites, resulting in increased labile OM inputs to the surface peat, thereby enhancing microbial activity and greenhouse gas production. Because shallow peat is most susceptible to enhanced warming, increases in labile OM inputs to the surface, in particular, are likely to result in significant changes to CO 2 and CH 4 dynamics and methanogenic pathways. In support of this hypothesis, significant correlations were observed between metabolites and temperature consistent with increased availability of labile substrates, which may stimulate more rapid turnover of microbial proteins. An increase in the abundance of methanogenic genes in response to the increase in the abundance of labile substrates was accompanied by a shift toward acetoclastic and methylotrophic methanogenesis. Our results suggest that as peatland vegetation trends toward increasing vascular plant cover with warming, we can expect a concomitant shift toward increasingly methanogenic conditions and amplified climate-peatland feedbacks.
Competing Interests: The authors declare no competing interest.
Databáze: MEDLINE
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