The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory
Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves o...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Blair, Neal E. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer International Publishing AG, part of Springer Nature 2018 |
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| Übergeordnetes Werk: |
Enthalten in: Biogeochemistry - Springer International Publishing, 1984, 138(2018), 2 vom: 23. März, Seite 171-195 |
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| Übergeordnetes Werk: |
volume:138 ; year:2018 ; number:2 ; day:23 ; month:03 ; pages:171-195 |
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| DOI / URN: |
10.1007/s10533-018-0439-9 |
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| 520 | |a Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. | ||
| 650 | 4 | |a Reservoirs | |
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| 700 | 1 | |a Leithold, Elana L. |4 aut | |
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| 700 | 1 | |a Rhoads, Bruce |4 aut | |
| 700 | 1 | |a Yu, Mingjing |4 aut | |
| 700 | 1 | |a Lewis, Quinn |4 aut | |
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10.1007/s10533-018-0439-9 doi (DE-627)OLC2050435134 (DE-He213)s10533-018-0439-9-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Blair, Neal E. verfasserin (orcid)0000-0002-3449-3371 aut The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory 2018 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing AG, part of Springer Nature 2018 Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. Reservoirs C-cycle Methane Carbon sequestration Leithold, Elana L. aut Thanos Papanicolaou, A. N. aut Wilson, Christopher G. aut Keefer, Laura aut Kirton, Erin aut Vinson, David aut Schnoebelen, Doug aut Rhoads, Bruce aut Yu, Mingjing aut Lewis, Quinn aut Enthalten in Biogeochemistry Springer International Publishing, 1984 138(2018), 2 vom: 23. März, Seite 171-195 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:138 year:2018 number:2 day:23 month:03 pages:171-195 https://doi.org/10.1007/s10533-018-0439-9 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_4012 AR 138 2018 2 23 03 171-195 |
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10.1007/s10533-018-0439-9 doi (DE-627)OLC2050435134 (DE-He213)s10533-018-0439-9-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Blair, Neal E. verfasserin (orcid)0000-0002-3449-3371 aut The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory 2018 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing AG, part of Springer Nature 2018 Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. Reservoirs C-cycle Methane Carbon sequestration Leithold, Elana L. aut Thanos Papanicolaou, A. N. aut Wilson, Christopher G. aut Keefer, Laura aut Kirton, Erin aut Vinson, David aut Schnoebelen, Doug aut Rhoads, Bruce aut Yu, Mingjing aut Lewis, Quinn aut Enthalten in Biogeochemistry Springer International Publishing, 1984 138(2018), 2 vom: 23. März, Seite 171-195 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:138 year:2018 number:2 day:23 month:03 pages:171-195 https://doi.org/10.1007/s10533-018-0439-9 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_4012 AR 138 2018 2 23 03 171-195 |
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10.1007/s10533-018-0439-9 doi (DE-627)OLC2050435134 (DE-He213)s10533-018-0439-9-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Blair, Neal E. verfasserin (orcid)0000-0002-3449-3371 aut The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory 2018 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing AG, part of Springer Nature 2018 Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. Reservoirs C-cycle Methane Carbon sequestration Leithold, Elana L. aut Thanos Papanicolaou, A. N. aut Wilson, Christopher G. aut Keefer, Laura aut Kirton, Erin aut Vinson, David aut Schnoebelen, Doug aut Rhoads, Bruce aut Yu, Mingjing aut Lewis, Quinn aut Enthalten in Biogeochemistry Springer International Publishing, 1984 138(2018), 2 vom: 23. März, Seite 171-195 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:138 year:2018 number:2 day:23 month:03 pages:171-195 https://doi.org/10.1007/s10533-018-0439-9 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_4012 AR 138 2018 2 23 03 171-195 |
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10.1007/s10533-018-0439-9 doi (DE-627)OLC2050435134 (DE-He213)s10533-018-0439-9-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Blair, Neal E. verfasserin (orcid)0000-0002-3449-3371 aut The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory 2018 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing AG, part of Springer Nature 2018 Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. Reservoirs C-cycle Methane Carbon sequestration Leithold, Elana L. aut Thanos Papanicolaou, A. N. aut Wilson, Christopher G. aut Keefer, Laura aut Kirton, Erin aut Vinson, David aut Schnoebelen, Doug aut Rhoads, Bruce aut Yu, Mingjing aut Lewis, Quinn aut Enthalten in Biogeochemistry Springer International Publishing, 1984 138(2018), 2 vom: 23. März, Seite 171-195 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:138 year:2018 number:2 day:23 month:03 pages:171-195 https://doi.org/10.1007/s10533-018-0439-9 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_4012 AR 138 2018 2 23 03 171-195 |
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10.1007/s10533-018-0439-9 doi (DE-627)OLC2050435134 (DE-He213)s10533-018-0439-9-p DE-627 ger DE-627 rakwb eng 540 550 VZ 13 ssgn Blair, Neal E. verfasserin (orcid)0000-0002-3449-3371 aut The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory 2018 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer International Publishing AG, part of Springer Nature 2018 Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. Reservoirs C-cycle Methane Carbon sequestration Leithold, Elana L. aut Thanos Papanicolaou, A. N. aut Wilson, Christopher G. aut Keefer, Laura aut Kirton, Erin aut Vinson, David aut Schnoebelen, Doug aut Rhoads, Bruce aut Yu, Mingjing aut Lewis, Quinn aut Enthalten in Biogeochemistry Springer International Publishing, 1984 138(2018), 2 vom: 23. März, Seite 171-195 (DE-627)12916786X (DE-600)50671-0 (DE-576)014454904 0168-2563 nnns volume:138 year:2018 number:2 day:23 month:03 pages:171-195 https://doi.org/10.1007/s10533-018-0439-9 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_4012 AR 138 2018 2 23 03 171-195 |
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the c-biogeochemistry of a midwestern usa agricultural impoundment in context: lake decatur in the intensively managed landscape critical zone observatory |
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The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory |
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Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. © Springer International Publishing AG, part of Springer Nature 2018 |
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Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. © Springer International Publishing AG, part of Springer Nature 2018 |
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Abstract The damming of rivers has created hotspots for organic carbon sequestration and methane production on a global scale as the reservoirs intercept fluvial suspended and dissolved loads. To better understand how the C-biogeochemistry of a reservoir responds to watershed processes and evolves over time, Lake Decatur, located in the Intensively Managed Landscape Critical Zone Observatory (IML-CZO) was studied. Solid phase analyses (% organic C, C/N, $ δ^{13} $C, $ δ^{15} $N) of soils and sediments sampled from stream bank exposures, river suspensions, and the lake bottom were conducted to characterize organic C (OC) sources throughout the sedimentary system. Agriculturally-driven soil erosion rapidly altered lake bathymetry causing an evolution of sedimentary and OC deposition patterns, which in turn shaped where and when methane production occurred. A positive correlation between OC accumulation rate and porewater dissolved inorganic C (DIC) $ δ^{13} $C profiles indicates that methane generation is strongly influenced by OC burial rate. The sources of the lake bed particulate organic C (POC) have also evolved over time. Drowned vegetation and/or shoreline inputs were dominant initially in areas adjacent to the original river channel but were rapidly overwhelmed by the deposition of sediments derived from eroded agricultural soils. Eutrophication of the lake followed with the onset of heavy fertilizer application post-1960. This succession of sources is expected to be commonplace for reservoirs greater than ~ 50–60 years old in agricultural settings because of the relative timing of tillage and fertilizer practices. The 13C/12C ratios of methane from Lake Decatur were more depleted in 13C than what is commonly expected for freshwater sedimentary environments. The 13C-depletion suggests that $ CO_{2} $-reduction is the dominant methanogenic pathway rather than the anticipated acetate dissimilation process. The isotopic observations reveal that commonly held assumptions about methane production and its C-isotopic signature in freshwater systems are over-simplified and not strictly applicable to this system. © Springer International Publishing AG, part of Springer Nature 2018 |
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