DOI: 10.1038/ngeo2611
论文题名: Nitrous oxide sinks and emissions in boreal aquatic networks in Quebec
作者: Soued C. ; Del Giorgio P.A. ; Maranger R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 2 起始页码: 116
结束页码: 120
语种: 英语
Scopus关键词: aquatic ecosystem
; Boreal Kingdom
; dissolved organic carbon
; emission inventory
; flux measurement
; greenhouse gas
; nitrogen cycle
; nitrous oxide
; oxygen
; partial pressure
; pH
; source-sink dynamics
; temperate environment
; uncertainty analysis
; Canada
; Quebec [Canada]
英文摘要: Inland waters are important sites of nitrogen processing1,2, and represent a significant component of the global budget of nitrous oxide, a powerful greenhouse gas. Measurements have focused on nitrogen-rich temperate rivers, with low-nitrogen freshwater systems at high latitudes receiving less attention. Here we measured surface water nitrous oxide partial pressures and calculated fluxes across 321 rivers, lakes and ponds in three boreal regions of Québec, Canada. Fluxes to the atmosphere ranged from-23.1 to 115.7 μmolm-2 d-1, with high variability among ecosystem types, regions and seasons. Surprisingly, over 40% of the systems sampled were under-saturated in nitrous oxide during the summer, and one region's aquatic network was a net atmospheric sink. Fluxes could not be predicted from the relatively narrow range in nitrogen concentrations, but the aquatic systems acting as sinks tended to have lower pH, higher dissolved organic carbon and lower oxygen concentrations. Given the large variability in observed fluxes, we estimate that high-latitude aquatic networks may emit from-0.07 to 0.20 TgN2O-N yr-1. The potential of boreal aquatic networks to act as net atmospheric nitrous oxide sinks highlights the extensive uncertainty in our understanding of global freshwater nitrous oxide budgets. © 2016 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106084
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: Département des Sciences Biologiques, Université de Montreál, Montreál, QC, Canada; Département des Sciences Biologiques, Université du Québec À Montreál, Montreál, QC, Canada
Recommended Citation:
Soued C.,Del Giorgio P.A.,Maranger R.. Nitrous oxide sinks and emissions in boreal aquatic networks in Quebec[J]. Nature Geoscience,2016-01-01,9(2)