Chemical characterization of microbial-dominated soil organic matter in the Garwood Valley, Antarctica

Xiaojuan Feng, Andre J. Simpson, Edward G. Gregorich, Bo Elberling, David W. Hopkins, Ashley D. Sparrow, Philip M. Novis, Lawrence G. Greenfield, Myrna J. Simpson

    Research output: Contribution to journalArticle

    Abstract

    Despite its harsh environmental conditions, terrestrial Antarctica contains a relatively large microbial biomass. Natural abundance carbon and nitrogen stable isotope signatures of organic materials in the dry valleys indicate mixed provenance of the soil organic matter (SOM) with varying proportions of contributions from lichens, mosses, lake-derived algae and cyanobacteria. Here we employed two complementary analytical techniques, biomarker measurements by gas chromatography/mass spectrometry and solution-state H-1 nuclear magnetic resonance spectroscopy, to provide further information at a molecular-level about the composition and possible source of SOM in the Garwood Valley, Antarctica. The predominance of branched alkanes and short-chain lipids in the solvent extracts indicates that the primary contribution to the SOM was microbial-derived. Chemical structures in the NaOH extracts from soils were also dominated by amide, peptides, and a CH3-dominating aliphatic region that were characteristic of microbial signatures. Furthermore, the SOM in the Garwood Valley contained compounds that were different from those in the cyanobacteria-dominated mat from a nearby lake (including monoethyl alkanes and enriched side-chain protons). This observation suggests that easily degradable carbon sources from the nearby lake did not dominate the SOM, which is consistent with a fast turnover of the mat-derived organic matter found in the valley. This study highlights the important role of native soil microbes in the carbon transformation and biogeochemistry in terrestrial Antarctica. (C) 2010 Elsevier Ltd. All rights reserved.

    Original languageEnglish
    Pages (from-to)6485-6498
    Number of pages14
    JournalGeochimica et Cosmochimica Acta
    Volume74
    Issue number22
    DOIs
    Publication statusPublished - 15 Nov 2010

    Cite this

    Feng, X., Simpson, A. J., Gregorich, E. G., Elberling, B., Hopkins, D. W., Sparrow, A. D., ... Simpson, M. J. (2010). Chemical characterization of microbial-dominated soil organic matter in the Garwood Valley, Antarctica. Geochimica et Cosmochimica Acta, 74(22), 6485-6498. https://doi.org/10.1016/j.gca.2010.08.019
    Feng, Xiaojuan ; Simpson, Andre J. ; Gregorich, Edward G. ; Elberling, Bo ; Hopkins, David W. ; Sparrow, Ashley D. ; Novis, Philip M. ; Greenfield, Lawrence G. ; Simpson, Myrna J. / Chemical characterization of microbial-dominated soil organic matter in the Garwood Valley, Antarctica. In: Geochimica et Cosmochimica Acta. 2010 ; Vol. 74, No. 22. pp. 6485-6498.
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    abstract = "Despite its harsh environmental conditions, terrestrial Antarctica contains a relatively large microbial biomass. Natural abundance carbon and nitrogen stable isotope signatures of organic materials in the dry valleys indicate mixed provenance of the soil organic matter (SOM) with varying proportions of contributions from lichens, mosses, lake-derived algae and cyanobacteria. Here we employed two complementary analytical techniques, biomarker measurements by gas chromatography/mass spectrometry and solution-state H-1 nuclear magnetic resonance spectroscopy, to provide further information at a molecular-level about the composition and possible source of SOM in the Garwood Valley, Antarctica. The predominance of branched alkanes and short-chain lipids in the solvent extracts indicates that the primary contribution to the SOM was microbial-derived. Chemical structures in the NaOH extracts from soils were also dominated by amide, peptides, and a CH3-dominating aliphatic region that were characteristic of microbial signatures. Furthermore, the SOM in the Garwood Valley contained compounds that were different from those in the cyanobacteria-dominated mat from a nearby lake (including monoethyl alkanes and enriched side-chain protons). This observation suggests that easily degradable carbon sources from the nearby lake did not dominate the SOM, which is consistent with a fast turnover of the mat-derived organic matter found in the valley. This study highlights the important role of native soil microbes in the carbon transformation and biogeochemistry in terrestrial Antarctica. (C) 2010 Elsevier Ltd. All rights reserved.",
    author = "Xiaojuan Feng and Simpson, {Andre J.} and Gregorich, {Edward G.} and Bo Elberling and Hopkins, {David W.} and Sparrow, {Ashley D.} and Novis, {Philip M.} and Greenfield, {Lawrence G.} and Simpson, {Myrna J.}",
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    Feng, X, Simpson, AJ, Gregorich, EG, Elberling, B, Hopkins, DW, Sparrow, AD, Novis, PM, Greenfield, LG & Simpson, MJ 2010, 'Chemical characterization of microbial-dominated soil organic matter in the Garwood Valley, Antarctica', Geochimica et Cosmochimica Acta, vol. 74, no. 22, pp. 6485-6498. https://doi.org/10.1016/j.gca.2010.08.019

    Chemical characterization of microbial-dominated soil organic matter in the Garwood Valley, Antarctica. / Feng, Xiaojuan; Simpson, Andre J.; Gregorich, Edward G.; Elberling, Bo; Hopkins, David W.; Sparrow, Ashley D.; Novis, Philip M.; Greenfield, Lawrence G.; Simpson, Myrna J.

    In: Geochimica et Cosmochimica Acta, Vol. 74, No. 22, 15.11.2010, p. 6485-6498.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Chemical characterization of microbial-dominated soil organic matter in the Garwood Valley, Antarctica

    AU - Feng, Xiaojuan

    AU - Simpson, Andre J.

    AU - Gregorich, Edward G.

    AU - Elberling, Bo

    AU - Hopkins, David W.

    AU - Sparrow, Ashley D.

    AU - Novis, Philip M.

    AU - Greenfield, Lawrence G.

    AU - Simpson, Myrna J.

    PY - 2010/11/15

    Y1 - 2010/11/15

    N2 - Despite its harsh environmental conditions, terrestrial Antarctica contains a relatively large microbial biomass. Natural abundance carbon and nitrogen stable isotope signatures of organic materials in the dry valleys indicate mixed provenance of the soil organic matter (SOM) with varying proportions of contributions from lichens, mosses, lake-derived algae and cyanobacteria. Here we employed two complementary analytical techniques, biomarker measurements by gas chromatography/mass spectrometry and solution-state H-1 nuclear magnetic resonance spectroscopy, to provide further information at a molecular-level about the composition and possible source of SOM in the Garwood Valley, Antarctica. The predominance of branched alkanes and short-chain lipids in the solvent extracts indicates that the primary contribution to the SOM was microbial-derived. Chemical structures in the NaOH extracts from soils were also dominated by amide, peptides, and a CH3-dominating aliphatic region that were characteristic of microbial signatures. Furthermore, the SOM in the Garwood Valley contained compounds that were different from those in the cyanobacteria-dominated mat from a nearby lake (including monoethyl alkanes and enriched side-chain protons). This observation suggests that easily degradable carbon sources from the nearby lake did not dominate the SOM, which is consistent with a fast turnover of the mat-derived organic matter found in the valley. This study highlights the important role of native soil microbes in the carbon transformation and biogeochemistry in terrestrial Antarctica. (C) 2010 Elsevier Ltd. All rights reserved.

    AB - Despite its harsh environmental conditions, terrestrial Antarctica contains a relatively large microbial biomass. Natural abundance carbon and nitrogen stable isotope signatures of organic materials in the dry valleys indicate mixed provenance of the soil organic matter (SOM) with varying proportions of contributions from lichens, mosses, lake-derived algae and cyanobacteria. Here we employed two complementary analytical techniques, biomarker measurements by gas chromatography/mass spectrometry and solution-state H-1 nuclear magnetic resonance spectroscopy, to provide further information at a molecular-level about the composition and possible source of SOM in the Garwood Valley, Antarctica. The predominance of branched alkanes and short-chain lipids in the solvent extracts indicates that the primary contribution to the SOM was microbial-derived. Chemical structures in the NaOH extracts from soils were also dominated by amide, peptides, and a CH3-dominating aliphatic region that were characteristic of microbial signatures. Furthermore, the SOM in the Garwood Valley contained compounds that were different from those in the cyanobacteria-dominated mat from a nearby lake (including monoethyl alkanes and enriched side-chain protons). This observation suggests that easily degradable carbon sources from the nearby lake did not dominate the SOM, which is consistent with a fast turnover of the mat-derived organic matter found in the valley. This study highlights the important role of native soil microbes in the carbon transformation and biogeochemistry in terrestrial Antarctica. (C) 2010 Elsevier Ltd. All rights reserved.

    U2 - 10.1016/j.gca.2010.08.019

    DO - 10.1016/j.gca.2010.08.019

    M3 - Article

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    SP - 6485

    EP - 6498

    JO - Geochimica et Cosmochimica Acta

    JF - Geochimica et Cosmochimica Acta

    SN - 0016-7037

    IS - 22

    ER -