2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2019 | 9:45 AM - 10:00 AM | BIOGEOCHEMICAL PATTERNS OF INTERMITTENT STREAMS IN SPACE AND TIME: IMPACTS OF DRYING AND WILDFIRE ON CARBON AND NUTRIENT DYNAMICS | 151 G

BIOGEOCHEMICAL PATTERNS OF INTERMITTENT STREAMS IN SPACE AND TIME: IMPACTS OF DRYING AND WILDFIRE ON CARBON AND NUTRIENT DYNAMICS

Stream drying (intermittency) and wildfire are expected to increase under current climate change projections for the western United States. However, the impacts of both stream drying and fire on stream carbon and nutrient dynamics are not well understood. To close this gap, In 2016 and 2017, we examined spatial and temporal patterns and carbon dynamics of a burned and an unburned headwater stream in southwest Idaho. We predicted that chemical constituent heterogeneity increases with drying, and hypothesized that as streams dry, evapoconcentration and/or increased in-stream production increases dissolved carbon concentration. Also, we expected that spatial heterogeneity in biogeochemistry would decrease with time following fire. During stream drying, we sampled surface water at 10 to 50 meter intervals over 2500 meters. We found a 2-fold increase in downstream DIC concentrations with drying. DIC semivariograms showed a 20-fold increase for the burned stream and a 3-fold increase for the unburned stream from April to June. We conclude that stream DIC chemistry becomes more heterogeneous with drying, and that heterogeneity increases immediately following fire. Additionally, there is high variation in DOC sourcing along the longitudinal stream profile.

Intermittency
Spatial
Carbon

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Presenters/Authors

Ruth MacNeille (), Idaho State University, macnruth@isu.edu;