EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2019 | 11:30 AM - 11:45 AM | STREAM FLOW AND SOLUTE FLUX RESPONSES TO WARMING AND ELEVATED CO2 IN A BOREAL PEATLAND | 250 AB
STREAM FLOW AND SOLUTE FLUX RESPONSES TO WARMING AND ELEVATED CO2 IN A BOREAL PEATLAND
The Spruce and Peatland Responses Under Changing Environments project is an ecosystem-scale experiment examining the effects of elevated temperature (+0, +2.25, +4.5, +6.75, +9°C) and CO2 concentrations (+500 ppm) on peatland ecosystem processes, including stream flow and solute dynamics. After three years of warming, stream flow and solute concentrations and fluxes have changed considerably. Stream flow from the +9°C (warmest) treatments was 19-63% lower (depending on the year) than from the +0°C (unheated) treatments because evapotranspiration increased with warming. Total organic carbon (TOC) concentrations in stream water increased with warming; in 2018, mean TOC concentrations were 54 mg/L in the +0°C treatments and 101 mg/L in the +9°C treatments. While there were strong responses in TOC concentrations to warming, nutrient concentrations did not change. Despite higher TOC concentrations, cumulative TOC fluxes were lower with warming in 2016 and 2017 because stream flow reductions with warming dominated the TOC flux response. In the third year (2018), outflow patterns began to shift and TOC fluxes from the +9°C treatments were similar to fluxes from the less-warm treatments. These findings highlight the complexity of peatland stream and solute responses to climate change.
- ClimateChange
- Wetland
- Carbon
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Presenters/Authors
Natalie A. Griffiths
(), Oak Ridge National Laboratory, griffithsna@ornl.gov;
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Stephen D. Sebestyen
(), USDA Forest Service-Northern Research Station, ssebestyen@fs.fed.us;
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Keith Oleheiser
(), XCEL Engineering, olehe003@d.umn.edu;
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Paul Hanson
(), Oak Ridge National Laboratory, hansonpj@ornl.gov;
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