2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 9:30 AM - 9:45 AM | SALINITY EFFECTS ON GREENHOUSE GAS EMISSIONS FROM WETLAND SOILS ARE CONTINGENT UPON HYDROLOGIC SETTING: A MICROCOSM EXPERIMENT | 330 B
SALINITY EFFECTS ON GREENHOUSE GAS EMISSIONS FROM WETLAND SOILS ARE CONTINGENT UPON HYDROLOGIC SETTING: A MICROCOSM EXPERIMENT
Human appropriation of surface water and extensive ditching and draining of coastal plain landscapes are interacting with rising sea levels to increase the frequency of saltwater intrusion into freshwater coastal wetlands. We performed a full factorial experiment in which we exposed intact soil cores from a freshwater wetland to four experimental marine salt treatments and two hydrologic treatments. We measured the resulting treatment effects on the emissions of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) over 90 days. We compared control treatments to artificial saltwater (target salinity of 5 ppt) and to two treatments that added sulfate alone and saltwater with the sulfate removed. We found that all marine salt treatments suppressed CO2 production, with these effects more pronounced in the flooded treatments. Surprisingly, CH4 fluxes from our flooded cores increased between 300 to 1200% relative to controls in both saltwater treatments, with the sulfate free saltwater treatment stimulating greater CH4 emissions. N2O emissions increased under drought and increased salinity. Our results demonstrate that saltwater enrichment of forested wetlands may enhance greenhouse gas emissions and that the magnitude and form of these emissions are contingent upon wetland hydrology.
- Hydrology
- Climate Change
- Aquatic-terrestrial Linkage
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Presenters/Authors
Marcelo Ardon
(), North Carolina State University, mlardons@ncsu.edu;
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Ashley Helton
(), University of Connecticut, ashley.helton@uconn.edu;
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Emily Bernhardt
(), Duke University, ebernhar@duke.edu;
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