DOI: 10.1007/s10533-017-0336-7
Scopus记录号: 2-s2.0-85018738078
论文题名: Impact of seasonal changes in stream metabolism on nitrate concentrations in an urban stream
作者: Ledford S.H. ; Lautz L.K. ; Vidon P.G. ; Stella J.C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 133, 期: 3 起始页码: 317
结束页码: 331
语种: 英语
英文关键词: Nitrate
; Nutrient uptake
; Seasonality
; Surface water
; Urban water chemistry
Scopus关键词: biogeochemistry
; concentration (composition)
; metabolism
; nitrate
; nutrient uptake
; seasonality
; streamwater
; surface water
; water chemistry
; water quality
; algae
; Chlorophyta
英文摘要: Nitrate (NO3 −) dynamics in urban streams differ from many natural streams due to stormwater runoff, sewage inputs, decreased groundwater discharge, often limited hyporheic exchange, increased primary productivity, and limited carbon input. We investigated NO3 − dynamics in a first-order urban stream in Syracuse, NY, which has urbanized headwaters and a geomorphologically natural downstream section. Twice-monthly water sampling, NO3 − injection tests, NO3 − isotopic analysis, filamentous algae mat density, and riparian shading were used to identify processes regulating NO3 − dynamics in the stream over a 12-month period. The urban headwater reach had low NO3 − (0.006–0.2 mg N/L) in the spring through fall, with a minimum uptake length of 900 m, no canopy cover, and high algae mat density. The downstream natural reach (100% canopy cover during the summer and low algae mat density) had nitrate concentrations between 0.6 and 1.2 mg N/L from winter to summer, which decreased during autumn leaf-off. In the urban reach, autotrophic uptake by filamentous green algae is a major NO3 − sink in summer. In the natural reach, the addition of organic matter to the stream at leaf-off led to a decrease in NO3 − concentration followed by an increase in NO3 − concentration in winter as gross primary productivity decreased. This study shows that the balance between autotrophy and heterotrophy in urban streams is variable and depends on an interplay of drivers such as temperature, light, and carbon inputs that are mediated by the riparian ecosystem. © 2017, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83271
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: Department of Earth and Environmental Science, Temple University, 1301 N. 13th St, Philadelphia, PA, United States; Department of Earth Sciences, Syracuse University, 333 Heroy Geology Laborator, Syracuse, NY, United States; Department of Forest and Natural Resources Management, State University of New York Environmental Science and Forestry, 1 Forestry Dr, Syracuse, NY, United States
Recommended Citation:
Ledford S.H.,Lautz L.K.,Vidon P.G.,et al. Impact of seasonal changes in stream metabolism on nitrate concentrations in an urban stream[J]. Biogeochemistry,2017-01-01,133(3)