NDLI: Impact of seasonal changes in stream metabolism on nitrate concentrations in an urban stream

Content Provider	Springer Nature Link
Author	Ledford, Sarah H. Lautz, Laura K. Vidon, Philippe G. Stella, John C.
Copyright Year	2017
Abstract	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.
Starting Page	317
Ending Page	331
Page Count	15
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	133
Issue Number	3
e-ISSN	1573515X
Language	English
Publisher	Springer International Publishing
Publisher Date	2017-05-05
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	Nitrate Nutrient uptake Seasonality Surface water Urban water chemistry Biogeosciences Ecosystems Environmental Chemistry Life Sciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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