DOI: 10.1002/2015GL063756
论文题名: A new perspective on environmental controls of marine nitrogen fixation
作者: Landolfi A. ; Koeve W. ; Dietze H. ; Kähler P. ; Oschlies A.
刊名: Geophysical Research Letters
ISSN: 0094-9271
EISSN: 1944-9002
出版年: 2015
卷: 42, 期: 11 起始页码: 4482
结束页码: 4489
语种: 英语
英文关键词: marine biogeochemical modeling
; marine N cycle
; marine N2 fixation
; North Atlantic
; phytoplankton coexistence
Scopus关键词: Competition
; Ecology
; Investments
; Mobile security
; Nitrogen
; Nutrients
; Phosphorus
; Phytoplankton
; Biogeochemical modeling
; Competitive advantage
; Dissolved organic phosphorus (DOP)
; Environmental control
; N cycles
; N2 fixation
; North Atlantic
; Resource competitions
; Nitrogen fixation
英文摘要: Growing slowly, marine N2 fixers are generally expected to be competitive only where nitrogen (N) supply is low relative to that of phosphorus (P) with respect to the cellular N:P ratio (R) of nonfixing phytoplankton. This is at odds with observed high N2 fixation rates in the oligotrophic North Atlantic where the ratio of nutrients supplied to the surface is elevated in N relative to the average R (16:1). In this study, we investigate several mechanisms to solve this puzzle: iron limitation, phosphorus enhancement by preferential remineralization or stoichiometric diversity of phytoplankton, and dissolved organic phosphorus (DOP) utilization. Combining resource competition theory and a global coupled ecosystem-circulation model, we find that the additional N and energy investments required for exoenzymatic breakdown of DOP give N2 fixers a competitive advantage in oligotrophic P-starved regions. Accounting for this mechanism expands the ecological niche of N2 fixers also to regions where the nutrient supply is high in N relative to R, yielding, in our model, a pattern consistent with the observed high N2 fixation rates in the oligotrophic North Atlantic. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84934438861&doi=10.1002%2f2015GL063756&partnerID=40&md5=1c309fbb4448d5df42388ebd858151d7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8887
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung, Marine Biogeochemical Modelling, Kiel, Germany
Recommended Citation:
Landolfi A.,Koeve W.,Dietze H.,et al. A new perspective on environmental controls of marine nitrogen fixation[J]. Geophysical Research Letters,2015-01-01,42(11).