Geochemical drivers of organic matter decomposition in Arctic tundra soils
Abstract
Climate change is warming tundra ecosystems in the Arctic, resulting in the decomposition of previously-frozen soil organic matter (SOM) and release of carbon (C) to the atmosphere; however, the processes that control SOM decomposition and C emissions remain highly uncertain. In this study, we evaluate geochemical factors that influence anaerobic production of carbon dioxide (CO2) and methane (CH4) in the active layers of four ice-wedge polygons. Surface and soil pore waters were collected during the annual thaw season over a two-year period in an area containing waterlogged, low-centered polygons and well-drained, high-centered polygons. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C as determined using spectroscopic and chromatographic techniques. Iron was present as Fe(II) in soil solution near the permafrost boundary but enriched as Fe(III) in the middle of the active layer, similar to dissolved aromatic-C and organic acids. Dissolved CH4 increased relative to dissolved CO2 with depth and varied with soil moisture in the middle of the active layer in patterns that were positively correlated with the proportion of dissolved Fe(III) in transitional and low-centered polygon soils but negatively correlated in the drier flat- and high-centered polygons. Thesemore »
- 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)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Canadian Light Source, Saskatoon, SK (Canada)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1235820
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Biogeochemistry
- Additional Journal Information:
- Journal Volume: 126; Journal Issue: 3; Journal ID: ISSN 0168-2563
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; iron biogeochemistry; Tundra soil; active layer; soil organic matter; methane
Citation Formats
Herndon, Elizabeth M., Yang, Ziming, Graham, David E., Wullschleger, Stan D., Gu, Baohua, Liang, Liyuan, Bargar, John, Janot, Noemie, and Regier, Tom Z. Geochemical drivers of organic matter decomposition in Arctic tundra soils. United States: N. p., 2015.
Web. doi:10.1007/s10533-015-0165-5.
Herndon, Elizabeth M., Yang, Ziming, Graham, David E., Wullschleger, Stan D., Gu, Baohua, Liang, Liyuan, Bargar, John, Janot, Noemie, & Regier, Tom Z. Geochemical drivers of organic matter decomposition in Arctic tundra soils. United States. https://doi.org/10.1007/s10533-015-0165-5
Herndon, Elizabeth M., Yang, Ziming, Graham, David E., Wullschleger, Stan D., Gu, Baohua, Liang, Liyuan, Bargar, John, Janot, Noemie, and Regier, Tom Z. Mon .
"Geochemical drivers of organic matter decomposition in Arctic tundra soils". United States. https://doi.org/10.1007/s10533-015-0165-5. https://www.osti.gov/servlets/purl/1235820.
@article{osti_1235820,
title = {Geochemical drivers of organic matter decomposition in Arctic tundra soils},
author = {Herndon, Elizabeth M. and Yang, Ziming and Graham, David E. and Wullschleger, Stan D. and Gu, Baohua and Liang, Liyuan and Bargar, John and Janot, Noemie and Regier, Tom Z.},
abstractNote = {Climate change is warming tundra ecosystems in the Arctic, resulting in the decomposition of previously-frozen soil organic matter (SOM) and release of carbon (C) to the atmosphere; however, the processes that control SOM decomposition and C emissions remain highly uncertain. In this study, we evaluate geochemical factors that influence anaerobic production of carbon dioxide (CO2) and methane (CH4) in the active layers of four ice-wedge polygons. Surface and soil pore waters were collected during the annual thaw season over a two-year period in an area containing waterlogged, low-centered polygons and well-drained, high-centered polygons. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C as determined using spectroscopic and chromatographic techniques. Iron was present as Fe(II) in soil solution near the permafrost boundary but enriched as Fe(III) in the middle of the active layer, similar to dissolved aromatic-C and organic acids. Dissolved CH4 increased relative to dissolved CO2 with depth and varied with soil moisture in the middle of the active layer in patterns that were positively correlated with the proportion of dissolved Fe(III) in transitional and low-centered polygon soils but negatively correlated in the drier flat- and high-centered polygons. These results suggest that microbial-mediated Fe oxidation and reduction influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis. As a result, we infer that geochemical differences induced by water saturation dictate microbial products of SOM decomposition, and Fe geochemistry is an important factor regulating methanogenesis in anoxic tundra soils.},
doi = {10.1007/s10533-015-0165-5},
journal = {Biogeochemistry},
number = 3,
volume = 126,
place = {United States},
year = {Mon Dec 07 00:00:00 EST 2015},
month = {Mon Dec 07 00:00:00 EST 2015}
}
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