2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 9:45 AM - 10:00 AM | FLOW REGIME INFLUENCES ON CARBON DIOXIDE AND METHANE FLUXES AND SOURCES IN FORESTED OZARK STREAMS | 330 B
FLOW REGIME INFLUENCES ON CARBON DIOXIDE AND METHANE FLUXES AND SOURCES IN FORESTED OZARK STREAMS
A growing body of work has provided estimates of stream contributions to carbon dioxide (CO2) and methane (CH4) dynamics across the United States. However, few studies have addressed the impact of flow regime on CO2 and CH4 fluxes. We determined summer daily CO2 and CH4 flux rates, carbon gas sources, and instream factors related to carbon gas flux rates in six forested streams within the two dominant natural flow regimes in northern Arkansas, runoff flashy and groundwater flashy systems. Flow types differed primarily in water source, intermittency, and ecoregion. We found that daily CO2 and CH4 fluxes did not differ significantly between flow regimes (CO2: p= 0.19, CH4: p= 0.27) , though both fluxes tended to be greater and more variable across streams at groundwater sites. Riparian soil respiration was the primary source of instream CO2 across all streams (dCO2= -17.6 to -22.0). CH4 in runoff streams streams originated from natural gas (dCH4= -38.8 to -43.7), while both thermogenic and biogenic CH4 were found in groundwater streams (dCH4= -32.5 to -50.0). Our work suggests that flow regime is likely an important player in stream carbon sources and fluxes.
- Carbon
- Flow
- Ecosystem
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Presenters/Authors
Allyn Dodd
(), Lyon College, allyn.dodd@lyon.edu;
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Erik Pollock
(), University of Arkansas, epolloc@uark.edu;
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Daniel Magoulick
(), Arkansas Cooperative Fish and Wildlife Research Unit, University of Arkansas, danmag@uark.edu;
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Michelle Evans-White
(), University of Arkansas, mevanswh@uark.edu;
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