| DOI: | 10.1002/2017JG004165
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| Scopus记录号: | 2-s2.0-85045326137
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| 论文题名: | Biomodulation of Nitrogen Cycle in Suspended Sediment |
| 作者: | Tang F.H.M.; Maggi F.
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| 刊名: | Journal of Geophysical Research: Biogeosciences
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| ISSN: | 21698953
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| 出版年: | 2018
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| 卷: | 123, 期:4 | | 起始页码: | 1230
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| 结束页码: | 1246
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| 语种: | 英语
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| 英文关键词: | ammonium
; Michaelis-Menten
; microbial dynamics
; necromass
; nitrate
; suspended particulate matter
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| Scopus关键词: | adsorption
; ammonium
; aquatic ecosystem
; biogeochemistry
; complexation
; concentration (composition)
; dissolution
; dissolved oxygen
; inorganic nitrogen
; leaching
; metabolism
; microbial activity
; microbial community
; mineral
; nitrate
; nitrogen cycle
; nutrient dynamics
; sediment chemistry
; suspended particulate matter
; water quality
|
| 英文摘要: | Biogeochemical experiments and modeling were coupled to investigate how nutrient leaching to aquatic ecosystems changes the dynamics of microbial community on suspended sediment and how these changes modulate the nitrogen cycle. Mineral suspensions amended with inorganic nitrogen (NH+4 and NO-3) and inoculated with native sedimentary microbial strains were tested in a settling column under continuous water quality measurements. Experiments were used to calibrate and validate a kinetic model that explicitly described the chemical adsorption on minerals, aqueous complexation, gas dissolution, microbial metabolism, necromass dynamics, and microbial competition for limiting substrates. Modeling revealed that the interactions between microbial functional groups were highly nonlinear and highly sensitive to changes in nutrient and dissolved oxygen concentrations, showing shifts in regimes where a functional group became prevalent over the others. Our results suggested that necromass dynamics played a major role in sustaining microbial growth in low nutrient conditions and had an important control over the N cycle. The reaction network and model structure presented in this study provide a tool to analyze and predict the long-term nutrient dynamics of both natural and engineered aquatic ecosystems. ©2018. American Geophysical Union. All Rights Reserved. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/114205
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Laboratory for Advanced Environmental Engineering Research, School of Civil Engineering, The University of Sydney, Sydney, NSW, Australia
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| Recommended Citation: | |
Tang F.H.M.,Maggi F.. Biomodulation of Nitrogen Cycle in Suspended Sediment[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(4)
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