globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-018-0439-9
Scopus记录号: 2-s2.0-85044368700
论文题名:
The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory
作者: Blair N.E.; Leithold E.L.; Thanos Papanicolaou A.N.; Wilson C.G.; Keefer L.; Kirton E.; Vinson D.; Schnoebelen D.; Rhoads B.; Yu M.; Lewis Q.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 138, 期:2
起始页码: 171
结束页码: 195
语种: 英语
英文关键词: C-cycle ; Carbon sequestration ; Methane ; Reservoirs
英文摘要: 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, δ13C, δ15N) 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) δ13C 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 CO2-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. © 2018, Springer International Publishing AG, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83165
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Departments of Civil and Environmental Engineering, and Earth and Planetary Sciences, Northwestern University, Evanston, IL, United States; Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC, United States; Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN, United States; Illinois State Water Survey, Champaign, IL, United States; Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL, United States; Department of Geography & Earth Sciences, University of North Carolina – Charlotte, Charlotte, NC, United States; USGS, Texas Water Science Center, San Antonio, TX, United States; Department of Geography and Geographic Information Science, University of Illinois at Urbana-Champaign, Champaign, IL, United States

Recommended Citation:
Blair N.E.,Leithold E.L.,Thanos Papanicolaou A.N.,et al. The C-biogeochemistry of a Midwestern USA agricultural impoundment in context: Lake Decatur in the intensively managed landscape critical zone observatory[J]. Biogeochemistry,2018-01-01,138(2)
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