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6/06/2017 | 10:00 AM - 10:15 AM | GROUNDWATER INPUTS DRIVE LONGITUDINAL PATTERNS OF STREAM CO2 AND CH4 EMISSIONS IN A BOREAL LAKE-STREAM SYSTEM | 306A

GROUNDWATER INPUTS DRIVE LONGITUDINAL PATTERNS OF STREAM CO2 AND CH4 EMISSIONS IN A BOREAL LAKE-STREAM SYSTEM

Boreal headwater streams emit substantial amounts of carbon dioxide (CO2) and methane (CH4) to the atmosphere. However, the relative contribution of terrestrial vs. aquatic carbon (C) sources to these emissions remains unclear. We measured biweekly (May-November) CO2 and CH4 fluxes at 50-m intervals along a 1.5 km reach draining a small lake. We also estimated groundwater C inputs, CO2 and CH4 emissions, and stream metabolism across a range of flow conditions. On average, both CO2 and CH4 fluxes decreased markedly during the first 500 m of the reach, but then increased gradually along the following 1000 m. Lake dynamics influenced C emissions near the outlet (0-300 m), whereas terrestrial inputs were the major source of inorganic C lower in the reach. Stream CO2 and CH4 concentrations increased by 24-90% immediately after four groundwater discharge zones, generating hot-spots of C emissions. Our study shows that CO2 and CH4 emissions can change substantially over time and space in response to catchment hydrology and landscape features and suggests that discrete spatial measurements may limit the reliability of C emission estimates from streams.

C28 Land-Water Interfaces
C27 Landuse and Non-Point source Impacts
C10 Biogeochemistry

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Presenters/Authors

Anna Lupon (), Swedish University of Agricultural Sciences, anna.lupon@slu.se;