globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-014-9971-4
Scopus记录号: 2-s2.0-84907616901
论文题名:
Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention
作者: Beaulieu J.J.; Mayer P.M.; Kaushal S.S.; Pennino M.J.; Arango C.P.; Balz D.A.; Canfield T.J.; Elonen C.M.; Fritz K.M.; Hill B.H.; Ryu H.; Domingo J.W.S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期:1
起始页码: 107
结束页码: 126
语种: 英语
英文关键词: 15N ; Bacteria ; Extracellular enzyme activity ; Stable isotope ; Uptake length ; Uptake velocity
Scopus关键词: bacterium ; ecosystem service ; enzyme activity ; freshwater ecosystem ; nitrate ; nitrogen ; organic matter ; periphyton ; primary production ; streamwater ; water quality ; watershed ; Cincinnati ; Ohio ; United States
英文摘要: Nitrogen (N) retention in streams is an important ecosystem service that may be affected by the widespread burial of streams in stormwater pipes in urban watersheds. We predicted that stream burial suppresses the capacity of streams to retain nitrate (NO3 −) by eliminating primary production, reducing respiration rates and organic matter availability, and increasing specific discharge. We tested these predictions by measuring whole-stream NO3 − removal rates using 15NO3 − isotope tracer releases in paired buried and open reaches in three streams in Cincinnati, Ohio (USA) during four seasons. Nitrate uptake lengths were 29 times greater in buried than open reaches, indicating that buried reaches were less effective at retaining NO3 − than open reaches. Burial suppressed NO3 − retention through a combination of hydrological and biological processes. The channel shape of two of the buried reaches increased specific discharge which enhanced NO3 − transport from the channel, highlighting the relationship between urban infrastructure and ecosystem function. Uptake lengths in the buried reaches were further lengthened by low stream biological NO3 − demand, as indicated by NO3 − uptake velocities 17-fold lower than that of the open reaches. We also observed differences in the periphyton enzyme activity between reaches, indicating that the effects of burial cascade from the microbial to the ecosystem scale. Our results suggest that stream restoration practices involving “daylighting” buried streams have the potential to increase N retention. Further work is needed to elucidate the impacts of stream burial on ecosystem functions at the larger stream network scale. © 2014, The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83583
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: US EPA, Office of Research and Development, National Risk Management Research Laboratory, Cincinnati, OH, United States; US EPA, Office of Research and Development, National Risk Management Research Laboratory, Ada, OK, United States; Department of Geology and Earth Systems Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Biological Sciences, Central Washington University, Ellensburg, WA, United States; Pegasus Technical Services, Cincinnati, OH, United States; US EPA, Office of Research and Development, National Exposure Research Laboratory, Cincinnati, OH, United States; US EPA, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Duluth, MN, United States; US EPA, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Corvallis, OR, United States

Recommended Citation:
Beaulieu J.J.,Mayer P.M.,Kaushal S.S.,et al. Effects of urban stream burial on organic matter dynamics and reach scale nitrate retention[J]. Biogeochemistry,2014-01-01,121(1)
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