DOI: 10.1002/2015GB005278
Scopus记录号: 2-s2.0-84955320383
论文题名: Ammonia and nitrite oxidation in the Eastern Tropical North Pacific
作者: Peng X ; , Fuchsman C ; A ; , Jayakumar A ; , Oleynik S ; , Martens-Habbena W ; , Devol A ; H ; , Ward B ; B
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 12 起始页码: 2034
结束页码: 2049
语种: 英语
英文关键词: ammonia oxidation
; Eastern Tropical North Pacific
; nitrification
; nitrite oxidation
; oxycline
; oxygen minimum zone
Scopus关键词: abundance
; ammonia
; biogeochemical cycle
; inhibition
; nitrification
; nitrite
; nitrogen cycle
; nitrous oxide
; oxidation
; oxygen
; oxygen minimum layer
; vertical distribution
; Pacific Ocean
; Pacific Ocean (North)
; Archaea
; Bacteria (microorganisms)
; Nitrosomonadales
; Proteobacteria
英文摘要: Nitrification plays a key role in the marine nitrogen (N) cycle, including in oceanic oxygen minimum zones (OMZs), which are hot spots for denitrification and anaerobic ammonia oxidation (anammox). Recent evidence suggests that nitrification links the source (remineralized organic matter) and sink (denitrification and anammox) of fixed N directly in the steep oxycline in the OMZs. We performed shipboard incubations with 15N tracers to characterize the depth distribution of nitrification in the Eastern Tropical North Pacific (ETNP). Additional experiments were conducted to investigate photoinhibition. Allylthiourea (ATU) was used to distinguish the contribution of archaeal and bacterial ammonia oxidation. The abundance of archaeal and β-proteobacterial ammonia monooxygenase gene subunit A (amoA) was determined by quantitative polymerase chain reaction. The rates of ammonia and nitrite oxidation showed distinct subsurface maxima, with the latter slightly deeper than the former. The ammonia oxidation maximum coincided with the primary nitrite concentration maximum, archaeal amoA gene maximum, and the subsurface nitrous oxide maximum. Negligible rates of ammonia oxidation were found at anoxic depths, where high rates of nitrite oxidation were measured. Archaeal amoA gene abundance was generally 1 to 2 orders of magnitude higher than bacterial amoA gene abundance, and inhibition of ammonia-oxidizing bacteria with 10 μM ATU did not affect ammonia oxidation rates, indicating the dominance of archaea in ammonia oxidation. These results depict highly dynamic activities of ammonia and nitrite oxidation in the oxycline of the ETNP OMZ. © 2015. 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/77903
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geosciences, Princeton University, Princeton, NJ, United States; School of Oceanography, University of Washington, Seattle, WA, United States; Department of Civil and Environmental Engineering, University of Washington, Seattle, WA, United States
Recommended Citation:
Peng X,, Fuchsman C,A,et al. Ammonia and nitrite oxidation in the Eastern Tropical North Pacific[J]. Global Biogeochemical Cycles,2015-01-01,29(12)