2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2021 | 8:30 AM - 10:30 AM | THE FUTURE OF STREAM GREENHOUSE GAS DYNAMICS IN A STORMIER AND DRIER TROPICAL LANDSCAPE | Virtual Platform
THE FUTURE OF STREAM GREENHOUSE GAS DYNAMICS IN A STORMIER AND DRIER TROPICAL LANDSCAPE
Disturbances, such as droughts and hurricanes, can dramatically alter the structure and function of stream ecosystems. Large inputs of organic matter, riparian canopy opening and sustained impacts on hydrology following a disturbance can result in important changes in biogeochemical processes like greenhouse gas (GHG) production. To explore the impacts of disturbance on GHG dynamics, we measured dissolved carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) concentrations weekly in 8 montane streams in the Luquillo Experimental Forest, Puerto Rico during a drought (2015) and before and after Hurricane María (2017). Following the hurricane, we saw increased concentrations of and variability in CO2 and N2O across all sites but no apparent overall changes during drought. CH4 increased during drought conditions at a subset of the sites, possibly due to changing redox conditions. CH4 also increased after the hurricane at two sites from the same watershed that have a strong groundwater influence and relatively low oxygen availability. These results highlight how GHG dynamics and their response to disturbance might be influenced by antecedent and local site conditions and underscores the need for increased research regarding these processes in these frequently disturbed landscapes.
- Tropical streams and lakes
- Biogeochemistry
- Ecosystem Dynamics
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Presenters/Authors
Carla López-Lloreda
(), Virginia Tech, carla.lpez09@gmail.com;
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Allison Herreid
(), University of New Hampshire, ah1208@wildcats.unh.edu;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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