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,...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Herndon, Elizabeth M. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer International Publishing Switzerland 2015 |
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| Übergeordnetes Werk: |
Enthalten in: Biogeochemistry - Springer International Publishing, 1984, 126(2015), 3 vom: Dez., Seite 397-414 |
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| Übergeordnetes Werk: |
volume:126 ; year:2015 ; number:3 ; month:12 ; pages:397-414 |
| Links: |
|---|
| DOI / URN: |
10.1007/s10533-015-0165-5 |
|---|
| Katalog-ID: |
OLC2050432372 |
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| 520 | |a 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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. | ||
| 650 | 4 | |a Iron biogeochemistry | |
| 650 | 4 | |a Tundra soil | |
| 650 | 4 | |a Active layer | |
| 650 | 4 | |a Soil organic matter | |
| 650 | 4 | |a Methane | |
| 700 | 1 | |a Yang, Ziming |4 aut | |
| 700 | 1 | |a Bargar, John |4 aut | |
| 700 | 1 | |a Janot, Noemie |4 aut | |
| 700 | 1 | |a Regier, Tom Z. |4 aut | |
| 700 | 1 | |a Graham, David E. |4 aut | |
| 700 | 1 | |a Wullschleger, Stan D. |4 aut | |
| 700 | 1 | |a Gu, Baohua |4 aut | |
| 700 | 1 | |a Liang, Liyuan |4 aut | |
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10.1007/s10533-015-0165-5 doi (DE-627)OLC2050432372 (DE-He213)s10533-015-0165-5-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Herndon, Elizabeth M. verfasserin aut Geochemical drivers of organic matter decomposition in arctic tundra soils 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing Switzerland 2015 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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. Iron biogeochemistry Tundra soil Active layer Soil organic matter Methane Yang, Ziming aut Bargar, John aut Janot, Noemie aut Regier, Tom Z. aut Graham, David E. aut Wullschleger, Stan D. aut Gu, Baohua aut Liang, Liyuan aut Enthalten in Biogeochemistry Springer International Publishing, 1984 126(2015), 3 vom: Dez., Seite 397-414 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:126 year:2015 number:3 month:12 pages:397-414 https://doi.org/10.1007/s10533-015-0165-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-FOR SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_70 GBV_ILN_2027 GBV_ILN_4012 AR 126 2015 3 12 397-414 |
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10.1007/s10533-015-0165-5 doi (DE-627)OLC2050432372 (DE-He213)s10533-015-0165-5-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Herndon, Elizabeth M. verfasserin aut Geochemical drivers of organic matter decomposition in arctic tundra soils 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing Switzerland 2015 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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. Iron biogeochemistry Tundra soil Active layer Soil organic matter Methane Yang, Ziming aut Bargar, John aut Janot, Noemie aut Regier, Tom Z. aut Graham, David E. aut Wullschleger, Stan D. aut Gu, Baohua aut Liang, Liyuan aut Enthalten in Biogeochemistry Springer International Publishing, 1984 126(2015), 3 vom: Dez., Seite 397-414 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:126 year:2015 number:3 month:12 pages:397-414 https://doi.org/10.1007/s10533-015-0165-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-FOR SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_70 GBV_ILN_2027 GBV_ILN_4012 AR 126 2015 3 12 397-414 |
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10.1007/s10533-015-0165-5 doi (DE-627)OLC2050432372 (DE-He213)s10533-015-0165-5-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Herndon, Elizabeth M. verfasserin aut Geochemical drivers of organic matter decomposition in arctic tundra soils 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing Switzerland 2015 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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. Iron biogeochemistry Tundra soil Active layer Soil organic matter Methane Yang, Ziming aut Bargar, John aut Janot, Noemie aut Regier, Tom Z. aut Graham, David E. aut Wullschleger, Stan D. aut Gu, Baohua aut Liang, Liyuan aut Enthalten in Biogeochemistry Springer International Publishing, 1984 126(2015), 3 vom: Dez., Seite 397-414 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:126 year:2015 number:3 month:12 pages:397-414 https://doi.org/10.1007/s10533-015-0165-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-FOR SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_70 GBV_ILN_2027 GBV_ILN_4012 AR 126 2015 3 12 397-414 |
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10.1007/s10533-015-0165-5 doi (DE-627)OLC2050432372 (DE-He213)s10533-015-0165-5-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Herndon, Elizabeth M. verfasserin aut Geochemical drivers of organic matter decomposition in arctic tundra soils 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing Switzerland 2015 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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. Iron biogeochemistry Tundra soil Active layer Soil organic matter Methane Yang, Ziming aut Bargar, John aut Janot, Noemie aut Regier, Tom Z. aut Graham, David E. aut Wullschleger, Stan D. aut Gu, Baohua aut Liang, Liyuan aut Enthalten in Biogeochemistry Springer International Publishing, 1984 126(2015), 3 vom: Dez., Seite 397-414 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:126 year:2015 number:3 month:12 pages:397-414 https://doi.org/10.1007/s10533-015-0165-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-FOR SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_70 GBV_ILN_2027 GBV_ILN_4012 AR 126 2015 3 12 397-414 |
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10.1007/s10533-015-0165-5 doi (DE-627)OLC2050432372 (DE-He213)s10533-015-0165-5-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Herndon, Elizabeth M. verfasserin aut Geochemical drivers of organic matter decomposition in arctic tundra soils 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing Switzerland 2015 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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. Iron biogeochemistry Tundra soil Active layer Soil organic matter Methane Yang, Ziming aut Bargar, John aut Janot, Noemie aut Regier, Tom Z. aut Graham, David E. aut Wullschleger, Stan D. aut Gu, Baohua aut Liang, Liyuan aut Enthalten in Biogeochemistry Springer International Publishing, 1984 126(2015), 3 vom: Dez., Seite 397-414 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:126 year:2015 number:3 month:12 pages:397-414 https://doi.org/10.1007/s10533-015-0165-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-FOR SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_70 GBV_ILN_2027 GBV_ILN_4012 AR 126 2015 3 12 397-414 |
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geochemical drivers of organic matter decomposition in arctic tundra soils |
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Geochemical drivers of organic matter decomposition in arctic tundra soils |
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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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. © Springer International Publishing Switzerland 2015 |
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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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. © Springer International Publishing Switzerland 2015 |
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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 microbial production of carbon dioxide ($ CO_{2} $) and methane ($ CH_{4} $) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska. We report spatial and seasonal patterns of dissolved gases in relation to the geochemical properties of Fe and organic C in soil and soil solution, as determined using spectroscopic and chromatographic techniques. The chemical composition of soil water collected during the annual thaw season varied significantly with depth. Soil water in the middle of the active layer contained abundant Fe(III), and aromatic-C and low-molecular-weight organic acids derived from SOM decomposition. At these depths, $ CH_{4} $ was positively correlated with the ratio of Fe(III) to total Fe in waterlogged transitional and low-centered polygons but negatively correlated in the drier flat- and high-centered polygons. These observations contradict the expectation that $ CH_{4} $ would be uniformly low where Fe(III) was high due to inhibition of methanogenesis by Fe(III)-reduction reactions. Our results suggest that vertically-stratified Fe redox reactions influence respiration/fermentation of SOM and production of substrates (e.g., low-molecular-weight organic acids) for methanogenesis, but that these effects vary with soil moisture. 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. © Springer International Publishing Switzerland 2015 |
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