EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/22/2018 | 11:30 AM - 11:45 AM | THE EFFECTS OF LAND USE ON METABOLISM, NITRATE ASSIMILATION, AND DENITRIFICATION IN NEW ENGLAND STREAMS | 330 B
THE EFFECTS OF LAND USE ON METABOLISM, NITRATE ASSIMILATION, AND DENITRIFICATION IN NEW ENGLAND STREAMS
Aquatic ecosystem services are at risk of declining as a result of land use changes such as urbanization and agriculture. The effects of land use on stream processes such as metabolism, nitrogen fixation, and denitrification are poorly constrained in headwater streams. We sought to understand how land use affects biogeochemical cycling in headwater streams, hypothesizing that higher nutrient loading in urban and agricultural sites promotes metabolism and denitrification while reducing the role of nitrogen fixation. Three baseflow diel sampling rounds at each a forested, agricultural, and urbanized stream site were performed, while in situ nitrate sensors were also deployed periodically in each stream to quantify nitrate assimilation. Initial results indicated that the low nitrate forested stream showed nitrogen fixation, while the higher nitrate urban and agricultural streams showed denitrification. All sites were net heterotrophic but metabolic rates differed across land use types, with net daily metabolism ranging from 4.91 to 25.12 g/m2/day. These results suggest that the dominant ecosystem functions in small streams shift in response to land use change which may have implications for stream restoration.
- Landuse
- Denitrification
- Metabolism
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Presenters/Authors
Daniel Bolster
(), University of New Hampshire, drb1020@wildcats.unh.edu;
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Wilfred Wollheim
(), University of New Hampshire, wil.wollheim@unh.edu;
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