DOI: 10.1073/pnas.1921689117
论文题名: Upper Midwest lakes are supersaturated with N2
作者: Loeks-Johnson B.M. ; Cotner J.B.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 29 起始页码: 17063
结束页码: 17067
语种: 英语
英文关键词: Biogeochemistry
; Denitrification
; Nitrogen cycling
; Nitrogen fixation
Scopus关键词: nitrogen
; argon
; nitrogen
; oxygen
; anaerobic ammonium oxidation
; Article
; biogeochemistry
; controlled study
; denitrification
; nitrogen cycle
; nitrogen fixation
; priority journal
; seasonal variation
; trophic level
; chemistry
; greenhouse gas
; lake
; Minnesota
; Argon
; Greenhouse Gases
; Lakes
; Minnesota
; Nitrogen
; Nitrogen Fixation
; Oxygen
英文摘要: Little is known about the exchange of gaseous nitrogen (N2) with the atmosphere in freshwater systems. Although the exchange of N2, driven by excess or deficiencies relative to saturation values, has little relevance to the atmospheric N2 pool due to its large size, it does play an important role in freshwater and marine nitrogen (N) cycling. N-fixation converts N2 to ammonia, which can be used by microbes and phytoplankton, while denitrification/anammox effectively removes it by converting oxidized, inorganic N to N2. We examined N2 saturation to infer net biological nitrogen processes in 34 lakes across 5° latitude varying in trophic status, mixing regime, and bathymetry. Here, we report that nearly all lakes examined in the upper Midwest (USA) were supersaturated with N2 (>85% of samples, n = 248), suggesting lakes are continuously releasing nitrogen to the atmosphere. The traditional paradigm is that freshwaters compensate for N-limitation through N-fixation, but these results indicate that lakes were constantly losing N to the atmosphere via denitrification and/or anammox, suggesting that terrestrial N inputs are needed to balance the internal N cycle. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164130
Appears in Collections: 气候变化与战略
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作者单位: Loeks-Johnson, B.M., Department of Ecology Evolution and Behavior, University of Minnesota, St. Paul, MN 55108, United States; Cotner, J.B., Department of Ecology Evolution and Behavior, University of Minnesota, St. Paul, MN 55108, United States
Recommended Citation:
Loeks-Johnson B.M.,Cotner J.B.. Upper Midwest lakes are supersaturated with N2[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(29)