2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 12:00 PM - 12:15 PM | (DE)-COUPLING OF DISSOLVED ORGANIC CARBON AND DISSOLVED ORGANIC NITROGEN ACROSS STREAM ECOSYSTEMS | 410 B
(DE)-COUPLING OF DISSOLVED ORGANIC CARBON AND DISSOLVED ORGANIC NITROGEN ACROSS STREAM ECOSYSTEMS
Dissolved organic matter (DOM) is both a major energy and nutrient source in stream ecosystems. DOM is comprised of both dissolved organic carbon (DOC) and dissolved organic nitrogen (DON); however, it is not well understood how variable the relationship is between DOC and DON across watersheds and if these fractions are under different biogeochemical controls. Here we use long-term observational data and experimental data from across a global array of watersheds to examine the coupled cycling of DOC and DON. While DOC and DON concentrations are correlated at the global scale, their power-law relationship indicates that DON concentrations scale at 80% of each unit increase in DOC concentration. Across watershed we found scaling properties to be highly variable indicating that some streams experience DON depletion while other streams maintain a near 1:1 isometric relationship with increases in DOC. DOC and DON also respond in unique ways to inputs of nitrate; however the direction of their response (i.e. increase/decrease in concentration) appears to vary primarily at the biome scale. We invoke hydrological, physical and biological controls to explain variability in the decoupling of DOC and DON across watersheds.
- Carbon
- Nitrogen
- Organic Matter
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Presenters/Authors
Adam Wymore
(), University of New Hampshire, adam.wymore@unh.edu;
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Ashley Helton
(), University of Connecticut, ashley.helton@uconn.edu;
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Rebecca Barnes
(), Colorado College, rbarnes@coloradocollege.edu;
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Jack Brookshire
(), Montana State University, jbrookshire@montana.edu;
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Sujay Kaushal
(), University of Maryland, skaushal@umd.edu;
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Emily Bernhardt
(), Duke University, emily.bernhardt@duke.edu;
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Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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Penny Johnes
(), University of Bristol, penny.johnes@bristol.ac.uk;
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Sherri Johnson
(), U.S. Forest Service, Pacific Northwest Research Station, sherrijohnson@fs.fed.us;
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Pirkko Kortelainen
(), Finnish Environment Institute, pirkko.kortelainen@ymparisto.fi;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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Robert Spencer
(), Florida State University, rgspencer@fsu.edu;
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Bianca Rodriguez-Cardona
(), University of New Hampshire, bianca.rodz.pr@gmail.com;
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Alba Argerich
(), School of Natural Resources, University of Missouri, argericha@missouri.edu;
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Ashley Coble
(), National Council for Air and Stream Improvement, Inc., acoble@ncasi.org;
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Carla López-Lloreda
(), Virginia Tech, carla.lpez09@gmail.com;
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Pamela Sullivan
(), University of Kansas, plsullivan@ku.edu;
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Shahan Haq
(), University of Maryland, shahan66@gmail.com;
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Michelle Shattuck
(), University of New Hampshire, Michelle.Shattuck@unh.edu;
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