DOI: 10.1007/s10533-017-0371-4
Scopus记录号: 2-s2.0-85028754847
论文题名: Hydrological and biological processes modulate carbon, nitrogen and phosphorus flux from the St. Lawrence River to its estuary (Quebec, Canada)
作者: Hudon C. ; Gagnon P. ; Rondeau M. ; Hébert S. ; Gilbert D. ; Hill B. ; Patoine M. ; Starr M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 135, 期: 3 起始页码: 251
结束页码: 276
语种: 英语
英文关键词: Carbon
; Estuarine acidification
; Hypoxia
; Nitrogen
; Phosphorus
; Riverine loads
; St. Lawrence River
Scopus关键词: acidification
; anoxic conditions
; aquatic plant
; atmospheric deposition
; coastal zone
; discharge
; dissolved organic carbon
; estuarine environment
; nitrogen
; organic carbon
; phosphorus
; river basin
; suspended particulate matter
; wastewater
; Canada
; Great Lakes [North America]
; Lake Ontario
; Ottawa River
; Quebec [Canada]
; Saint Lawrence River
英文摘要: Increased flux of carbon and nutrients from human activities in river basins were linked to acidification and deepwater hypoxia in estuaries and coastal areas worldwide. Annual loads (1995–2011) of suspended particulate matter (SPM), dissolved organic carbon (DOC), total nitrogen (TN) and total phosphorus (TP) were assessed at the Lake Ontario inlet of the St. Lawrence River (SLR) (7110 m3 s−1) and its estuarine outlet at Québec City (12,090 m3 s−1). Internal loads from the Ottawa River (1950 m3 s−1), seventeen other tributaries, urban wastewaters, atmospheric deposition and erosion were also estimated. Erosion (65% of SPM, 29% of TP), inflow from Lake Ontario (42% of DOC, 47% of TN) and Ottawa River (28% of DOC) contributed important flux to the estuary. Loads from other tributaries (20 and 27% of TN and TP at Quebec City) largely exceeded municipal sources (6% of exported TN and TP) and require future remediation. Aquatic plants fixed 277,000 t of C, 49,000 t of N and 7000 t of P (May–Sept.), delaying the nutrient flux to the estuary and turning the SLR into a nutrient sink over summers of lowest discharge. Degradation of exported organic C could consume 5.4–7.1 million t O2 year−1 in the estuary whereas SLR flux of N and P represent 31–47% and 7–14% of total annual estuarine flux, respectively. Carbon and Nitrogen flux from freshwaters partly explain the decline in pH and oxygen concentrations in deep estuarine waters thus highlighting the need to reduce diffuse sources of nutrients in the entire watershed. © 2017, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83237
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: Environment and Climate Change Canada, St. Lawrence Centre, 105 McGill, Montreal, QC, Canada; Ministère du Développement durable, de l’ Environnement et de la Lutte contre les changements climatiques, 675, René-Lévesque Est, Quebec, QC, Canada; Fisheries and Oceans Canada, Maurice Lamontagne Institute, 850 route de la Mer, Mont-Joli, QC, Canada; Environment and Climate Change Canada, Canadian Center for Inland Waters, 867 Lakeshore Rd, Burlington, ON, Canada
Recommended Citation:
Hudon C.,Gagnon P.,Rondeau M.,et al. Hydrological and biological processes modulate carbon, nitrogen and phosphorus flux from the St. Lawrence River to its estuary (Quebec, Canada)[J]. Biogeochemistry,2017-01-01,135(3)