DOI: 10.1038/ngeo2322
论文题名: Increased mobilization of aged carbon to rivers by human disturbance
作者: Butman D.E. ; Wilson H.F. ; Barnes R.T. ; Xenopoulos M.A. ; Raymond P.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 2 起始页码: 112
结束页码: 116
语种: 英语
Scopus关键词: anthropogenic effect
; aquatic ecosystem
; carbon dioxide
; carbon emission
; dissolved organic carbon
; estimation method
; land use change
; precipitation (climatology)
英文摘要: Approximately 8% of anthropogenic carbon dioxide emissions are estimated to come from land-use change, but this estimate excludes fluxes of terrestrial carbon to aquatic ecosystems from human disturbance. Carbon fluxes from land to rivers have probably increased by 0.1 to 0.2 petagrams of carbon per year as a result of disturbances such as deforestation, agricultural intensification and the injection of human wastewater. Most dissolved organic carbon in rivers originates from young organic carbon from soils and vegetation, but aged carbon removed from the modern carbon cycle is also exported in many systems. Here we analyse a global data set of radiocarbon ages of riverine dissolved organic carbon and spatial data on land cover, population and environmental variables. We find that the age of dissolved organic carbon in rivers increases with population density and the proportion of human-dominated landscapes within a watershed, and decreases with annual precipitation. We reason that disturbance reintroduces aged soil organic matter into the modern carbon cycle, although fossil carbon in fertilizer or petroleum products may also be a source of aged carbon in disturbed watersheds. The total export from the terrestrial environment to freshwater systems remains unknown; nevertheless, our results suggest that 3-9% of dissolved organic carbon in rivers is aged carbon mobilized by human disturbance. © 2015 Macmillan Publishers Limited. All rights reserved Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106370
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: University of Washington, School of Environmental and Forest Sciences, Box 352100, Seattle, WA, United States; Brandon Research Centre, Agriculture and Agri-Food Canada, Brandon, MB, Canada; Environmental Program, Colorado College, Colorado Springs, CO, United States; Department of Biology, Trent University, Peterborough, ON, Canada; Yale School of Forestry and Environmental Studies, 195 Prospect Street, New Haven, CT, United States
Recommended Citation:
Butman D.E.,Wilson H.F.,Barnes R.T.,et al. Increased mobilization of aged carbon to rivers by human disturbance[J]. Nature Geoscience,2015-01-01,8(2)