DOI: 10.1007/s10533-014-9979-9
Scopus记录号: 2-s2.0-84907630132
论文题名: Longitudinal patterns in carbon and nitrogen fluxes and stream metabolism along an urban watershed continuum
作者: Kaushal S.S. ; Delaney-Newcomb K. ; Findlay S.E.G. ; Newcomer T.A. ; Duan S. ; Pennino M.J. ; Sivirichi G.M. ; Sides-Raley A.M. ; Walbridge M.R. ; Belt K.T.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 1 起始页码: 23
结束页码: 44
语种: 英语
英文关键词: Carbon
; New Watershed Concept
; Nitrogen
; Nutrient retention
; Urban watershed
Scopus关键词: carbon flux
; groundwater-surface water interaction
; longitudinal gradient
; metabolism
; nitrogen cycle
; primary production
; urbanization
; watershed
; Gwynns Falls
; Maryland
; United States
英文摘要: An urban watershed continuum framework hypothesizes that there are coupled changes in (1) carbon and nitrogen cycling, (2) groundwater-surface water interactions, and (3) ecosystem metabolism along broader hydrologic flowpaths. It expands our understanding of urban streams beyond a reach scale. We evaluated this framework by analyzing longitudinal patterns in: C and N concentrations and mass balances, groundwater-surface interactions, and stream metabolism and carbon quality from headwaters to larger order streams. 52 monitoring sites were sampled seasonally and monthly along the Gwynns Falls watershed, which drains 170 km2 of the Baltimore Long-Term Ecological Research site. Regarding our first hypothesis of coupled C and N cycles, there were significant inverse linear relationships between nitrate and dissolved organic carbon (DOC) and nitrogen longitudinally (P < 0.05). Regarding our second hypothesis of coupled groundwater-surface water interactions, groundwater seepage and leaky piped infrastructure contributed significant inputs of water and N to stream reaches based on mass balance and chloride/fluoride tracer data. Regarding our third hypothesis of coupled ecosystem metabolism and carbon quality, stream metabolism increased downstream and showed potential to enhance DOC lability (e.g., ~4 times higher mean monthly primary production in urban streams than forest streams). DOC lability also increased with distance downstream and watershed urbanization based on protein and humic-like fractions, with major implications for ecosystem metabolism, biological oxygen demand, and CO2 production and alkalinity. Overall, our results showed significant in-stream retention and release (0–100 %) of watershed C and N loads over the scale of kilometers, seldom considered when evaluating monitoring, management, and restoration effectiveness. Given dynamic transport and retention across evolving spatial scales, there is a strong need to longitudinally and synoptically expand studies of hydrologic and biogeochemical processes beyond a stream reach scale along the urban watershed continuum. © 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/83629
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: University of Maryland Center for Environmental Science, Solomons, MD, United States; Cary Institute of Ecosystem Studies, Millbrook, NY, United States; University of Maryland Baltimore County, Baltimore, MD, United States; USDA Agricultural Research Service, Beltsville, MD, United States; USDA Forest Service, Northern Research Station, Baltimore Field Station at University of Maryland Baltimore County, Baltimore, MD, United States; Department of Geology & Earth System Science Interdisciplinary Center, University of Maryland, 5825 University Research Court, College Park, MD, United States
Recommended Citation:
Kaushal S.S.,Delaney-Newcomb K.,Findlay S.E.G.,et al. Longitudinal patterns in carbon and nitrogen fluxes and stream metabolism along an urban watershed continuum[J]. Biogeochemistry,2014-01-01,121(1)