EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/06/2017 | 12:15 PM - 12:30 PM | THE STREAM FEASTS WHILE THE FOREST LEAKS: IN-STREAM AND WATERSHED RESPONSES TO A WHOLE WATERSHED ACID MITIGATION EXPERIMENT | 306A
THE STREAM FEASTS WHILE THE FOREST LEAKS: IN-STREAM AND WATERSHED RESPONSES TO A WHOLE WATERSHED ACID MITIGATION EXPERIMENT
Many headwater streams across the Northeast U.S. bear strong legacies of acid precipitation, despite long term declines in deposition. At Hubbard Brook, an experimental attempt to remediate decades of soil acidification successfully promoted forest growth and increased soil pH, but also generated dramatic increases in watershed nitrogen export. This experiment may provide an accelerated view into possible long-term trajectories of ecosystem recovery from acid precipitation. Here, we examine how the watershed acid remediation treatment has altered in-stream processing of nitrogen. We found that the treatment stream acted as a substantial net sink of nitrate during the growing season. During baseflow periods, nitrate flux declined by 15-55% along a 500m reach, despite a 2.4-fold increase in discharge over the same reach. By contrast, nitrate flux in the reference watershed increased monotonically with discharge. High nitrate export from the treatment watershed became more coupled to storm events, and denitrification potential increased threefold in treatment sediments. These results suggest that under ecosystem recovery from acid precipitation, aquatic ecosystems may act as substantial sinks of N, even as terrestrial ecosystems may become greater sources.
- C22 Disturbance
- C28 Land-Water Interfaces
- C10 Biogeochemistry
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Richard Marinos
(), University of Waterloo, rmarinos@uwaterloo.ca;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Emma Rosi
(), Cary Institute of Ecosystem Studies, rosie@caryinstitute.org;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Emily Bernhardt
(), Duke University, ebernhar@duke.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Lindsey Rustad
(), USFS Northern Research Station, lrustad@usfs.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
John Campbell
(), US Forest Service, Northern Research Station, jcampbell@fs.fed.us;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -