DOI: 10.1002/2015GL065595
论文题名: Paleoreconstruction of organic carbon inputs to an oxbow lake in the Mississippi River watershed: Effects of dam construction and land use change on regional inputs
作者: Bianchi T.S. ; Galy V. ; Rosenheim B.E. ; Shields M. ; Cui X. ; Van Metre P.
刊名: Geophysical Research Letters
ISSN: 0094-8542
EISSN: 1944-8273
出版年: 2015
卷: 42, 期: 19 起始页码: 7983
结束页码: 7991
语种: 英语
英文关键词: biomarker proxies
; dam reservoirs
; organic carbon cycling
; paleoreconstruction
Scopus关键词: Lakes
; Land use
; Lignin
; Organic carbon
; Phenols
; Reservoirs (water)
; Rivers
; Soil conservation
; Soils
; Conservation measures
; Dam reservoirs
; Hydrological modifications
; Long chain fatty acid
; Mississippi river
; Organic carbon cycling
; Paleoreconstruction
; Thermo-chemical stability
; Fatty acids
; biomarker
; bone
; carbon cycle
; dam construction
; fatty acid
; fluvial deposit
; land use change
; lignin
; nitrogen isotope
; organic carbon
; oxbow lake
; paleoenvironment
; phenol
; reconstruction
; sediment core
; soil conservation
; watershed
; Lake Whittington
; Mississippi River
; Missouri River
; United States
英文摘要: We use a dated sediment core from Lake Whittington (USA) in the lower Mississippi River to reconstruct linkages in the carbon cycling and fluvial sediment dynamics over the past 80 years. Organic carbon (OC) sources were characterized using bulk (δ13C, ramped pyrolysis-oxidation (PyrOx) 14C, δ15N, and TN:OC ratios) and compound-specific (lignin phenols and fatty acids, including δ13C and 14C of the fatty acids) analyses. Damming of the Missouri River in the 1950s, other hydrological modifications to the river, and soil conservation measures resulted in reduced net OC export, in spite of increasing OC concentrations. Decreasing δ13C values coincided with increases in δ15N, TN:OC ratios, long-chain fatty acids, and lignin-phenol concentrations, suggesting increased inputs of soil-derived OC dominated by C3 vegetation, mainly resulting from changes in farming practices and crop distribution. However, ramped PyrOx 14C showed no discernible differences downcore in thermochemical stability, indicating a limited impact on soil OC turnover. Key Points Dam reservoirs and oxbow lake cores integrate land use change Farming and dams have altered the downstream particle composition Organic carbon export is controlled by physical erosion rates © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84947019972&doi=10.1002%2f2015GL065595&partnerID=40&md5=5ac4748eb94f936dcac4d9c4eeda8213
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8158
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geological Sciences, University of Florida, Gainesville, FL, United States
Recommended Citation:
Bianchi T.S.,Galy V.,Rosenheim B.E.,et al. Paleoreconstruction of organic carbon inputs to an oxbow lake in the Mississippi River watershed: Effects of dam construction and land use change on regional inputs[J]. Geophysical Research Letters,2015-01-01,42(19).