2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 3:00 PM - 3:15 PM | PERMAFROST DETERMINES SOURCES OF DISSOLVED INORGANIC CARBON IN BOREAL FOREST WATERSHEDS | 330 B
PERMAFROST DETERMINES SOURCES OF DISSOLVED INORGANIC CARBON IN BOREAL FOREST WATERSHEDS
Half of the global carbon pool resides in permafrost, which is thawing from increasing global temperature. Permafrost serves as a barrier to water percolation into mineral soil and restricts surface flow to the upper organic layer. Whereas many solute concentrations are correlated with permafrost extent, we observe similar concentration of dissolved inorganic carbon (DIC) in headwater streams draining catchments with varying extents of permafrost (4-50% permafrost, 5.0-11.7 mg C/L) at Caribou-Poker Creeks Research Watershed (Fairbanks, AK, USA). We hypothesize that streams draining catchments underlain by large extent of permafrost have a greater proportion of DIC from soil respiration. Alternatively, streams draining catchments underlain by low extent of permafrost have a greater proportion of DIC from weathering. In this study, we measured pH and DIC concentration to partition carbonate ions, and quantified ecosystem respiration and diel variation of carbonate species using CO2 sensors. Ecosystem respiration did not vary between streams, and all streams were supersaturated with CO2. Preliminary results support our hypotheses that permafrost in watershed catchments influences the source of DIC and suggests that thawing permafrost has the potential to increase the proportion of DIC from weathering as permafrost thaws.
- Carbon
- Metabolism
- Arctic
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Presenters/Authors
Rachel Voight
(), University of Alaska Fairbanks, rlvoight@alaska.edu;
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Jeremy Jones
(), University of Alaska Fairbanks, jbjonesjr@alaska.edu;
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