2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2019 | 2:15 PM - 2:30 PM | INFLUENCE OF CATCHMENT MORPHOLOGY ON BIO-PHYSICAL DRIVERS OF CARBON FLUXES IN HEADWATER STREAMS | 251 AB
INFLUENCE OF CATCHMENT MORPHOLOGY ON BIO-PHYSICAL DRIVERS OF CARBON FLUXES IN HEADWATER STREAMS
Stream ecosystems are control points for carbon transformations and fluxes. The dual role of streams as conduits for CO2 evasion and downstream carbon transport as well sites of carbon retention and metabolism has been established by numerous studies. In order to integrate these disparate roles, it is imperative to empirically identify the role of ecological communities in partitioning carbon between these different pools.
Our study elucidates the influence of biological processes on catchment scale carbon fluxes. We monitored biological (e.g. metabolic) and physical carbon fluxes and in-situ carbon processing in two adjacent montane headwater catchments with varying ambient carbon concentrations. We observed that headwater streams exhibited substantial seasonal and spatial variation in (1) the balance of physical and biological carbon fluxes and (2) the degree of biological influence over carbon cycling, with local-scale variables (e.g. carbon source area configuration) acting as more important predictors of the magnitude of biological carbon fluxes than longitudinal network structure. Our findings help elucidate catchment scale drivers that control the balance of bio-physical fluxes and identify network positions (or times of the year) when ecological communities play a significant role in mediating catchment-scale carbon fluxes.
- Carbon
- Aquatic-terrestrial Linkage
- Riparian
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Presenters/Authors
Erin Seybold
(), Kansas Geological Survey, University of Kansas, erinseybold@ku.edu;
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Brian McGlynn
(), Duke University, brian.mcglynn@duke.edu;
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