DOI: 10.1002/2013GB004765
Scopus记录号: 2-s2.0-84920983156
论文题名: Effect of temperature on rates of ammonium uptake and nitrification in the western coastal Arctic during winter, spring, and summer
作者: Baer S ; E ; , Connelly T ; L ; , Sipler R ; E ; , Yager P ; L ; , Bronk D ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 12 起始页码: 1455
结束页码: 1466
语种: 英语
英文关键词: Arctic
; nitrification
; nitrogen uptake
; temperature
Scopus关键词: ammonia
; assimilation efficiency
; biogeochemical cycle
; global warming
; nitrification
; nutrient uptake
; spring (season)
; summer
; winter
; Alaska
; Arctic Ocean
; Barrow
; Chukchi Sea
; United States
; Bacteria (microorganisms)
英文摘要: Biogeochemical rate processes in the Arctic are not currently well constrained, and there is very limited information on how rates may change as the region warms. Here we present data on the sensitivity of ammonium (NH4 +) uptake and nitrification rates to short-term warming. Samples were collected from the Chukchi Sea off the coast of Barrow, Alaska, during winter, spring, and summer and incubated for 24h in the dark with additions of 15NH4 + at -1.5, 6, 13, and 20C. Rates of NH4 + uptake and nitrification were measured in conjunction with bacterial production. In all seasons, NH4 + uptake rates were highest at temperatures similar to current summertime conditions but dropped off with increased warming, indicative of psychrophilic (i.e., cold-loving) microbial communities. In contrast, nitrification rates were less sensitive to temperature and were higher in winter and spring compared to summer. These findings suggest that as the Arctic coastal ecosystem continues to warm, NH4 + assimilation may become increasingly important, relative to nitrification, although the magnitude of NH4 + assimilation would be still be lower than nitrification. Key Points Nitrification dominates ammonium sinks during winter and springAmmonium uptake, but not nitrification, increases with warmingBacterial production has multiple temperature optima ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77513
Appears in Collections: 气候变化事实与影响
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作者单位: Virginia Institute of Marine Science, College of William and Mary Virginia, Gloucester Point, United States; Now at Bigelow Laboratory for Ocean Sciences, East Boothbay, Maine, United States; Marine Sciences Institute, University of Texas at Austin, Port Aransas, TX, United States; Department of Marine Sciences, University of Georgia Georgia, Athens, United States
Recommended Citation:
Baer S,E,, Connelly T,et al. Effect of temperature on rates of ammonium uptake and nitrification in the western coastal Arctic during winter, spring, and summer[J]. Global Biogeochemical Cycles,2014-01-01,28(12)