DOI: 10.1029/2017JG004263
Scopus记录号: 2-s2.0-85049937947
论文题名: A Phytoplankton Model for the Allocation of Gross Photosynthetic Energy Including the Trade-Offs of Diazotrophy
作者: Nicholson D.P. ; Stanley R.H.R. ; Doney S.C.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1796
结束页码: 1816
语种: 英语
英文关键词: biogeochemistry
; diazotroph
; photosynthesis
; phytoplankton
; resource allocation
Scopus关键词: biogeochemistry
; carbon fixation
; cyanobacterium
; environmental conditions
; functional group
; growth rate
; nitrogen fixation
; photosynthesis
; phytoplankton
; resource allocation
; Crocosphaera watsonii
英文摘要: Gross photosynthetic activity by phytoplankton is directed to linear and alternative electron pathways that generate ATP, reductant, and fix carbon. Ultimately less than half is directed to net growth. Here we present a phytoplankton cell allocation model that explicitly represents a number of cell metabolic processes and functional pools with the goal of evaluating ATP and reductant demands as a function of light, nitrate, iron, oxygen, and temperature for diazotrophic versus nondiazotrophic growth. We employ model analogues of Synechoccocus and Crocosphaera watsonii, to explore the trade-offs of diazotrophy over a range of environmental conditions. Model analogues are identical in construction, except for an iron quota associated with nitrogenase, an additional respiratory demand to remove oxygen in order to protect nitrogenase and an additional ATP demand to split dinitrogen. We find that these changes explain observed differences in growth rate and iron limitation between diazotrophs and nondiazotrophs. Oxygen removal imparted a significantly larger metabolic cost to diazotrophs than ATP demand for fixing nitrogen. Results suggest that diazotrophs devote a much smaller fraction of gross photosynthetic energy to growth than nondiazotrophs. The phytoplankton cell allocation model model provides a predictive framework for how photosynthate allocation varies with environmental conditions in order to balance cellular demands for ATP and reductant across phytoplankton functional groups. ©2018. 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/113766
Appears in Collections: 气候减缓与适应
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作者单位: Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Chemistry, Wellesley College, Wellesley, MA, United States; Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States
Recommended Citation:
Nicholson D.P.,Stanley R.H.R.,Doney S.C.. A Phytoplankton Model for the Allocation of Gross Photosynthetic Energy Including the Trade-Offs of Diazotrophy[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)