DOI: 10.1029/2017JG004372
Scopus记录号: 2-s2.0-85050602354
论文题名: Influence of Stream-Subsurface Exchange Flux and Bacterial Biofilms on Oxygen Consumption Under Nutrient-Rich Conditions
作者: De Falco N. ; Boano F. ; Bogler A. ; Bar-Zeev E. ; Arnon S.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 7 起始页码: 2021
结束页码: 2034
语种: 英语
英文关键词: bacterial distribution
; gaining flow conditions
; hyporheic zone
; losing flow conditions
; metabolism
; stream-groundwater interactions
Scopus关键词: Bacteria (microorganisms)
英文摘要: The lack of a complete understanding of the complex reciprocal interactions between hydrological processes and the structure and function of microbial communities limits our ability to improve the predictions of microbial metabolism in streams. We report here on how overlying water velocity and losing and gaining flux interact with bacterial community structure and its activity to control oxygen consumption in a sandy streambed under high nutrient levels. We used an experimental flume packed with natural sediment and measured the bacterial biomass distribution and oxygen profiles in the streambed and across bed forms. Local oxygen consumption rates were calculated with a 1-D numerical model (GRADIENT). Bacterial abundance and production rates varied across the bed form within 1 order of magnitude, while their taxonomic classes were similar across bed forms despite variations in flow conditions and sediment disturbance events. However, bacterial production rates were not directly correlated with bacterial abundance. On the other hand, oxygen consumption rates ranged over 4 orders of magnitude across the bed forms and were highly correlated with the vertical exchange flux between the water and the streambed. The results strongly suggest that under high nutrient levels, the system is, in general, transport limited and that predicting oxygen consumption rates depends on local vertical exchange fluxes. ©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/113615
Appears in Collections: 气候减缓与适应
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作者单位: Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Beersheba, Midreshet Ben Gurion, Israel; Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Turin, Italy
Recommended Citation:
De Falco N.,Boano F.,Bogler A.,et al. Influence of Stream-Subsurface Exchange Flux and Bacterial Biofilms on Oxygen Consumption Under Nutrient-Rich Conditions[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(7)