globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13073
论文题名:
Sediment-phosphorus dynamics can shift aquatic ecology and cause downstream legacy effects after wildfire in large river systems
作者: Emelko M.B.; Stone M.; Silins U.; Allin D.; Collins A.L.; Williams C.H.S.; Martens A.M.; Bladon K.D.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:3
起始页码: 1168
结束页码: 1184
语种: 英语
英文关键词: Climate change ; Cumulative watershed ; Effects ; Eutrophication ; Land disturbance ; Phosphorus ; Sediment ; Treatability ; Wildfire
Scopus关键词: phosphorus ; water pollutant ; adsorption ; Alberta ; analysis ; chemistry ; fire ; river ; season ; sediment ; water pollutant ; water quality ; Adsorption ; Alberta ; Fires ; Geologic Sediments ; Phosphorus ; Rivers ; Seasons ; Water Pollutants, Chemical ; Water Quality
英文摘要: Global increases in the occurrence of large, severe wildfires in forested watersheds threaten drinking water supplies and aquatic ecology. Wildfire effects on water quality, particularly nutrient levels and forms, can be significant. The longevity and downstream propagation of these effects as well as the geochemical mechanisms regulating them remain largely undocumented at larger river basin scales. Here, phosphorus (P) speciation and sorption behavior of suspended sediment were examined in two river basins impacted by a severe wildfire in southern Alberta, Canada. Fine-grained suspended sediments (<125 μm) were sampled continuously during ice-free conditions over a two-year period (2009-2010), 6 and 7 years after the wildfire. Suspended sediment samples were collected from upstream reference (unburned) river reaches, multiple tributaries within the burned areas, and from reaches downstream of the burned areas, in the Crowsnest and Castle River basins. Total particulate phosphorus (TPP) and particulate phosphorus forms (nonapatite inorganic P, apatite P, organic P), and the equilibrium phosphorus concentration (EPC0) of suspended sediment were assessed. Concentrations of TPP and the EPC0 were significantly higher downstream of wildfire-impacted areas compared to reference (unburned) upstream river reaches. Sediments from the burned tributary inputs contained higher levels of bioavailable particulate P (NAIP) - these effects were also observed downstream at larger river basin scales. The release of bioavailable P from postfire, P-enriched fine sediment is a key mechanism causing these effects in gravel-bed rivers at larger basin scales. Wildfire-associated increases in NAIP and the EPC0 persisted 6 and 7 years after wildfire. Accordingly, this work demonstrated that fine sediment in gravel-bed rivers is a significant, long-term source of in-stream bioavailable P that contributes to a legacy of wildfire impacts on downstream water quality, aquatic ecology, and drinking water treatability. © 2016 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61464
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON, Canada; Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada; Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada; Sustainable Soils and Grassland Systems Department, Rothamsted Research, North Wyke, Okehampton, United Kingdom; Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, OR, United States

Recommended Citation:
Emelko M.B.,Stone M.,Silins U.,et al. Sediment-phosphorus dynamics can shift aquatic ecology and cause downstream legacy effects after wildfire in large river systems[J]. Global Change Biology,2016-01-01,22(3)
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