Pathways of anaerobic organic matter decomposition in tundra soils from Barrow, Alaska
Abstract
Arctic tundra soils store a large quantity of organic carbon that is susceptible to decomposition and release to the atmosphere as methane (CH4) and carbon dioxide (CO2) under a warming climate. Anaerobic processes that generate CH4 and CO2 remain unclear because previous studies have focused on aerobic decomposition pathways. To predict releases of CO2 and CH4 from tundra soils, it is necessary to identify pathways of soil organic matter decomposition under the anoxic conditions that are prevalent in Arctic ecosystems. Here molecular and spectroscopic techniques were used to monitor biological degradation of water-extractable organic carbon (WEOC) during anoxic incubation of tundra soils from a region of continuous permafrost in northern Alaska. Organic and mineral soils from the tundra active layer were incubated at –2, +4, or +8°C for up to 60 days to mimic the short-term thaw season. Results suggest that, under anoxic conditions, fermentation converted complex organic molecules into simple organic acids that were used in concomitant Fe-reduction and acetoclastic methanogenesis reactions. Nonaromatic compounds increased over time as WEOC increased. Organic acid metabolites initially accumulated in soils but were mostly depleted by day 60 because organic acids were consumed to produce Fe(II), CO2, and CH4. We conclude that fermentationmore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Kent State Univ., Kent, OH (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1235813
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Biogeosciences
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 12; Journal ID: ISSN 2169-8953
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; permafrost; soil carbon; degradation; methane; climate
Citation Formats
Herndon, Elizabeth M., Mann, Benjamin F., Chowdhury, Taniya Roy, Wullschleger, Stan D., Graham, David E., Liang, Liyuan, Gu, Baohua, and Yang, Ziming. Pathways of anaerobic organic matter decomposition in tundra soils from Barrow, Alaska. United States: N. p., 2015.
Web. doi:10.1002/2015JG003147.
Herndon, Elizabeth M., Mann, Benjamin F., Chowdhury, Taniya Roy, Wullschleger, Stan D., Graham, David E., Liang, Liyuan, Gu, Baohua, & Yang, Ziming. Pathways of anaerobic organic matter decomposition in tundra soils from Barrow, Alaska. United States. https://doi.org/10.1002/2015JG003147
Herndon, Elizabeth M., Mann, Benjamin F., Chowdhury, Taniya Roy, Wullschleger, Stan D., Graham, David E., Liang, Liyuan, Gu, Baohua, and Yang, Ziming. Mon .
"Pathways of anaerobic organic matter decomposition in tundra soils from Barrow, Alaska". United States. https://doi.org/10.1002/2015JG003147. https://www.osti.gov/servlets/purl/1235813.
@article{osti_1235813,
title = {Pathways of anaerobic organic matter decomposition in tundra soils from Barrow, Alaska},
author = {Herndon, Elizabeth M. and Mann, Benjamin F. and Chowdhury, Taniya Roy and Wullschleger, Stan D. and Graham, David E. and Liang, Liyuan and Gu, Baohua and Yang, Ziming},
abstractNote = {Arctic tundra soils store a large quantity of organic carbon that is susceptible to decomposition and release to the atmosphere as methane (CH4) and carbon dioxide (CO2) under a warming climate. Anaerobic processes that generate CH4 and CO2 remain unclear because previous studies have focused on aerobic decomposition pathways. To predict releases of CO2 and CH4 from tundra soils, it is necessary to identify pathways of soil organic matter decomposition under the anoxic conditions that are prevalent in Arctic ecosystems. Here molecular and spectroscopic techniques were used to monitor biological degradation of water-extractable organic carbon (WEOC) during anoxic incubation of tundra soils from a region of continuous permafrost in northern Alaska. Organic and mineral soils from the tundra active layer were incubated at –2, +4, or +8°C for up to 60 days to mimic the short-term thaw season. Results suggest that, under anoxic conditions, fermentation converted complex organic molecules into simple organic acids that were used in concomitant Fe-reduction and acetoclastic methanogenesis reactions. Nonaromatic compounds increased over time as WEOC increased. Organic acid metabolites initially accumulated in soils but were mostly depleted by day 60 because organic acids were consumed to produce Fe(II), CO2, and CH4. We conclude that fermentation of nonprotected organic matter facilitates methanogenesis and Fe reduction reactions, and that the proportion of organic acids consumed by methanogenesis increases relative to Fe reduction with increasing temperature. As a result, the decomposition pathways observed in this study are important to consider in numerical modeling of greenhouse gas production in the Arctic.},
doi = {10.1002/2015JG003147},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 12,
volume = 120,
place = {United States},
year = {Mon Nov 23 00:00:00 EST 2015},
month = {Mon Nov 23 00:00:00 EST 2015}
}
Web of Science
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