EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2019 | 12:00 PM - 12:15 PM | CARBON AVAILABILITY ENHANCES NITRATE REMOVAL IN TROPICAL MONTANE STREAMS | 250 AB
CARBON AVAILABILITY ENHANCES NITRATE REMOVAL IN TROPICAL MONTANE STREAMS
Tropical forests store large amounts of the earth’s terrestrial C, but many tropical streams have low levels of dissolved organic carbon (DOC). Because rates of nitrification are high and nitrate is often abundant relative to temperate streams, energy availability may limit inorganic N uptake. We conducted a series of experiments to explore the influence of DOC availability on tropical stream N cycling. Nutrient pulse additions of NO3 with and without an added C source were conducted in streams of the Luquillo Mountains, Puerto Rico. In the absence of added DOC, NO3 uptake was undetectable or had very long (>1000 m) uptake lengths (Sw). With bioavailable DOC added, NO3 Sw was reduced to 80-150 m, with the shortest lengths resulting from addition of dissolved organic nitrogen (urea). This demonstrates that the availability of DOC can enhance NO3 removal and that DON is a significant energy source in stream N uptake dynamics. Understanding nitrate processing in these streams is important to predict future trends for these montane watersheds, especially those impacted by hurricanes that elevate NO3 concentrations for years post impact.
- Carbon
- Nitrogen
- ClimateChange
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Presenters/Authors
Bianca Rodriguez-Cardona
(), University of New Hampshire, bianca.rodz.pr@gmail.com;
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Adam Wymore
(), University of New Hampshire, adam.wymore@unh.edu;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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