DOI: 10.1007/s10533-016-0212-x
Scopus记录号: 2-s2.0-84964296845
论文题名: Large differences in potential denitrification and sediment microbial communities across the Laurentian great lakes
作者: Small G.E. ; Finlay J.C. ; McKay R.M.L. ; Rozmarynowycz M.J. ; Brovold S. ; Bullerjahn G.S. ; Spokas K. ; Sterner R.W.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 128, 期: 3 起始页码: 353
结束页码: 368
语种: 英语
英文关键词: Denitrification
; Great Lakes
; Lake Erie
; Lake Superior
; Microbial community
; Nitrate
; Nitrogen
Scopus关键词: bottom water
; concentration (composition)
; denitrification
; lacustrine deposit
; lake pollution
; mesotrophic environment
; microbial community
; nitrate
; nitrogen
; oligotrophic environment
; organic carbon
; pollutant removal
; redox conditions
; trophic status
; Canada
; Great Lakes [North America]
; Laurentian Mountains
; Quebec [Canada]
英文摘要: Large lakes can efficiently remove reactive nitrogen (N) through denitrification, but nitrate levels in some large oligotrophic lakes are increasing, indicating that denitrification in these lakes is not capable of removing excess N. To better understand how lake trophic status and sediment redox conditions affect the capacity of the microbial community to remove excess N, we measured potential denitrification rates at 86 different stations across Lakes Superior, Huron, Erie, and Ontario. We also relate sediment microbial communities to potential denitrification rates and sediment characteristics for a subset of these sites. In eutrophic/mesotrophic Lake Erie, characterized by sediment with minimal oxygen penetration and relatively high sediment carbon (C) and N, potential denitrification rates were relatively high and increased by 2–3 orders of magnitude in response to additional nitrate and organic C. In contrast, in oligotrophic Lakes Superior and Ontario, and mesotrophic Lake Huron, where oxygen can penetrate several cm into sediment, potential denitrification rates were generally low and did not respond to additional nitrate and organic carbon. Sediment microbial communities showed a similar pattern across this gradient, correlated with potential denitrification rates, sediment %C, and bottom-water nitrate concentrations. This observed relationships between sediment redox conditions, potential denitrification rates, and microbial diversity suggest that sediment microbial communities in these and other oligotrophic large lakes may already be operating at or near their maximum denitrification rates. Unlike mesotrophic Lake Erie, microbial communities in oligotrophic lake sediments may lack the ability to mitigate increases in N loading through denitrification. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83394
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: Department of Biology, University of St. Thomas, 2115 Summit Ave., Saint Paul, MN, United States; Department of Ecology, Evolution, and Behavior, University of Minnesota-Twin Cities, 1987 Upper Buford Circle, Saint Paul, MN, United States; Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, United States; Large Lakes Observatory, University of Minnesota-Duluth, 2205 E 5th St, Duluth, MN, United States; United States Department of Agriculture-Agricultural Research Service, Saint Paul, MN, United States; Department of Soil, Water and Climate, University of Minnesota-Twin Cities, 1991 Upper Buford Circle, Saint Paul, MN, United States
Recommended Citation:
Small G.E.,Finlay J.C.,McKay R.M.L.,et al. Large differences in potential denitrification and sediment microbial communities across the Laurentian great lakes[J]. Biogeochemistry,2016-01-01,128(3)