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Title: Indexing Permafrost Soil Organic Matter Degradation Using High-Resolution Mass Spectrometry

Journal Article · · PLoS ONE
 [1];  [1];  [2];  [3];  [3];  [1];  [1];  [3];  [3];  [1];  [1];  [1];  [1];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Kent State Univ. (Ohio)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  4. Tennessee State Univ., Nashville, TN (United States)

Microbial degradation of soil organic matter (SOM) is a key process for terrestrial carbon cycling, although the molecular details of these transformations remain unclear. This study reports the application of ultrahigh resolution mass spectrometry to profile the molecular composition of SOM and its degradation during a simulated warming experiment. A soil sample, collected near Barrow, Alaska, USA, was subjected to a 40-day incubation under anoxic conditions and analyzed before and after the incubation to determine changes of SOM composition. A CHO index based on molecular C, H, and O data was utilized to codify SOM components according to their observed degradation potentials. Compounds with a CHO index score between 1 and 0 in a water-soluble fraction (WSF) demonstrated high degradation potential, with a highest shift of CHO index occurred in the N-containing group of compounds, while similar stoichiometries in a base-soluble fraction (BSF) did not. Additionally, compared with the classical H:C vs O:C van Krevelen diagram, CHO index allowed for direct visualization of the distribution of heteroatoms such as N in the identified SOM compounds. We demonstrate that CHO index is useful not only in characterizing arctic SOM at the molecular level but also enabling quantitative description of SOM degradation, thereby facilitating incorporation of the high resolution MS datasets to future mechanistic models of SOM degradation and prediction of greenhouse gas emissions.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830; AC05-00OR22725
OSTI ID:
1203369
Alternate ID(s):
OSTI ID: 1212345
Journal Information:
PLoS ONE, Vol. 10, Issue 6; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

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Cited By (11)

Interactive van Krevelen diagrams - Advanced visualisation of mass spectrometry data of complex mixtures: Interactive van Krevelen Diagrams journal February 2017
Fuel characteristics of sewage sludge using thermal treatment journal February 2019
Van Krevelen diagram visualization of high resolution-mass spectrometry metabolomics data with OpenVanKrevelen journal March 2018
Restricted morphospace occupancy of early Cambrian reef-building archaeocyaths journal March 2019
The Molecular Composition of Humic Substances Isolated From Yedoma Permafrost and Alas Cores in the Eastern Siberian Arctic as Measured by Ultrahigh Resolution Mass Spectrometry journal August 2019
Evaluation of an untargeted nano-liquid chromatography-mass spectrometry approach to expand coverage of low molecular weight dissolved organic matter in Arctic soil journal April 2019
Effect of endogenous microbiota on the molecular composition of cloud water: a study by Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS) journal May 2019
Generic parameters of first-order kinetics accurately describe soil organic matter decay in bare fallow soils over a wide edaphic and climatic range journal December 2019
Electrochemical characterization of natural organic matter by direct voltammetry in an aprotic solvent journal January 2019
Organic carbon stocks in the Russian Chernozem: Carbon stocks of Chernozems journal June 2005
Photochemical alteration of organic carbon draining permafrost soils shifts microbial metabolic pathways and stimulates respiration journal October 2017

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