DOI: 10.1002/2016GB005407
Scopus记录号: 2-s2.0-85012235876
论文题名: Multiple metabolisms constrain the anaerobic nitrite budget in the Eastern Tropical South Pacific
作者: Babbin A ; R ; , Peters B ; D ; , Mordy C ; W ; , Widner B ; , Casciotti K ; L ; , Ward B ; B
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 2 起始页码: 258
结束页码: 271
语种: 英语
英文关键词: anammox
; denitrification
; nitrite oxidation
; nitrogen cycle
; oxygen deficient zones
Scopus关键词: ammonification
; ammonium
; bacterium
; biogeochemistry
; denitrification
; global ocean
; metabolism
; nitrite
; nitrogen cycle
; organic matter
; tracer
; water column
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: The Eastern Tropical South Pacific is one of the three major oxygen deficient zones (ODZs) in the global ocean and is responsible for approximately one third of marine water column nitrogen loss. It is the best studied of the ODZs and, like the others, features a broad nitrite maximum across the low oxygen layer. How the microbial processes that produce and consume nitrite in anoxic waters interact to sustain this feature is unknown. Here we used 15N-tracer experiments to disentangle five of the biologically mediated processes that control the nitrite pool, including a high-resolution profile of nitrogen loss rates. Nitrate reduction to nitrite likely depended on organic matter fluxes, but the organic matter did not drive detectable rates of denitrification to N2. However, multiple lines of evidence show that denitrification is important in shaping the biogeochemistry of this ODZ. Significant rates of anaerobic nitrite oxidation at the ODZ boundaries were also measured. Iodate was a potential oxidant that could support part of this nitrite consumption pathway. We additionally observed N2 production from labeled cyanate and postulate that anammox bacteria have the ability to harness cyanate as another form of reduced nitrogen rather than relying solely on ammonification of complex organic matter. The balance of the five anaerobic rates measured—anammox, denitrification, nitrate reduction, nitrite oxidation, and dissimilatory nitrite reduction to ammonium—is sufficient to reproduce broadly the observed nitrite and nitrate profiles in a simple one-dimensional model but requires an additional source of reduced nitrogen to the deeper ODZ to avoid ammonium overconsumption. ©2017. 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/77773
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Geosciences, Princeton University, Princeton, NJ, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States; Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, WA, United States; Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States; Department of Ocean, Earth and Atmospheric Sciences, Old Dominion University, Norfolk, VA, United States
Recommended Citation:
Babbin A,R,, Peters B,et al. Multiple metabolisms constrain the anaerobic nitrite budget in the Eastern Tropical South Pacific[J]. Global Biogeochemical Cycles,2017-01-01,31(2)