DOI: 10.1007/s10533-014-9958-1
Scopus记录号: 2-s2.0-84907606807
论文题名: Effects of urban stream burial on nitrogen uptake and ecosystem metabolism: implications for watershed nitrogen and carbon fluxes
作者: Pennino M.J. ; Kaushal S.S. ; Beaulieu J.J. ; Mayer P.M. ; Arango C.P.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 1 起始页码: 247
结束页码: 269
语种: 英语
英文关键词: Carbon quality
; Fluorescence excitation-emission matrices
; Stream channelization
; Stream daylighting
; Tracer injection
; Transient storage
Scopus关键词: carbon flux
; ecosystem function
; fluorescence
; metabolism
; net primary production
; nitrogen cycle
; nutrient uptake
; urbanization
; watershed
英文摘要: Urbanization has resulted in the extensive burial and channelization of headwater streams, yet little is known about the impacts of stream burial on ecosystem functions critical for reducing downstream nitrogen (N) and carbon (C) exports. In order to characterize the biogeochemical effects of stream burial on N and C, we measured NO3 − uptake (using 15N-NO3 − isotope tracer releases) and gross primary productivity (GPP) and ecosystem respiration (ER) (using whole stream metabolism measurements). Experiments were carried out during four seasons, in three paired buried and open stream reaches, within the Baltimore Ecosystem Study Long-term Ecological Research site. Stream burial increased NO3 − uptake lengths by a factor of 7.5 (p < 0.01) and decreased NO3 − uptake velocity and areal NO3 − uptake rate by factors of 8.2 (p < 0.05) and 9.6 (p < 0.001), respectively. Stream burial decreased GPP by a factor of 11.0 (p < 0.01) and decreased ER by a factor of 5.0 (p < 0.05). From fluorescence Excitation Emissions Matrices analysis, buried streams were found to have significantly altered C quality, showing less labile dissolved organic matter. Furthermore, buried streams had significantly lower transient storage (TS) and water temperatures. Differences in NO3 − uptake, GPP, and ER in buried streams, were primarily explained by decreased TS, light availability, and C quality, respectively. At the watershed scale, we estimate that stream burial decreases NO3 − uptake by 39 % and C production by 194 %. Overall, our results suggest that stream burial significantly impacts NO3 − uptake, stream metabolism, and the quality of organic C exported from watersheds. Given the large impacts of stream burial on stream ecosystem processes, daylighting or de-channelization of streams, through hydrologic floodplain reconnection, may have the potential to alter ecosystem functions in urban watersheds, when used appropriately. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83704
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: Marine-Estuarine Environmental Studies Department, University of Maryland, Baltimore County, Baltimore, MD, United States; Department of Geology and Earth Systems Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; National Risk Management Laboratory, US EPA, Office of Research and Development, Cincinnati, OH, United States; Western Ecology Division, US EPA, National Health and Environmental Effects Research Laboratory, Corvallis, OR, United States; Department of Biological Sciences, Central Washington University, Ellensburg, WA, United States
Recommended Citation:
Pennino M.J.,Kaushal S.S.,Beaulieu J.J.,et al. Effects of urban stream burial on nitrogen uptake and ecosystem metabolism: implications for watershed nitrogen and carbon fluxes[J]. Biogeochemistry,2014-01-01,121(1)