EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 9:45 AM - 10:00 AM | Annual patterns in aquatic metabolism and CO2 emissions from New Hampshire streams | 306A
Annual patterns in aquatic metabolism and CO2 emissions from New Hampshire streams
Recent evidence has highlighted the ubiquity of carbon dioxide (CO2) supersaturation in streams, yet our understanding of how the source of CO2 (aquatic production versus catchment sources) varies in time and across different aquatic systems remains limited. Here we report two years of daily stream gross primary production (GPP), ecosystem respiration (ER), and CO2 emissions estimates across five New Hampshire streams that vary in size, nutrient loading, and landscape context. All streams were net heterotrophic, with predictable seasonal peaks in GPP and ER. The estimated contribution of aquatic net ecosystem production (NEP) to stream CO2 emissions varied from approximately 0 – 75%, although these estimates were sensitive to small changes in NEP for some sites. The proportion of CO2 emissions supported by aquatic NEP was lower at higher discharge, perhaps due to increased CO2 transport from soils to streams during wetter periods, or to biomass removal by scouring flows. Catchment sources represent substantial contributions to CO2 emissions from temperate streams, but the proportion of CO2 emissions from in situ carbon transformation is variable throughout the growing season.
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
- C10 Biogeochemistry
- C31 Organic Matter Processing
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Presenters/Authors
Lauren Koenig
(), University of New Hampshire, lauren.koenig@unh.edu;
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Lisle Snyder
(), University of New Hampshire, lisle.snyder@unh.edu;
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Alison Appling
(), US Geological Survey, alison.appling@gmail.com;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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Jody Potter
(), University of New Hampshire, jody.potter@unh.edu;
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Christopher Hunt
(), University of New Hampshire, chunt@unh.edu;
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