2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | MODELING DELAYED RESPIRATION OF LABILE DOC IN A STREAM | Virtual Platform
MODELING DELAYED RESPIRATION OF LABILE DOC IN A STREAM
Dissolved organic carbon (DOC) represents a large fluvial flux of carbon and supports respiration in streams. DOC comprises many compounds with varying reactivity, such that the DOC we measure in transport is the DOC that is not cycling quickly. Hence, it is difficult to study reactivity and fate of the DOC pool. To address this problem, we added 13C labeled glucose and plant litter leachate in separate slug additions to a tiny spring stream in Montana. Uptake was high for both carbon sources and matched that from other tracer studies. Mineralization of the DOC into the dissolved inorganic carbon pool (measured as CO2 using cavity ringdown spectroscopy) was a small fraction of what was removed. Mineralization was initially high, but then tailed off for >20 h following the slug addition. A compartment model with a range of residence times of DOC in biomass pools reflected this pattern: some tracer DOC was immediately respired while more was fully incorporated into biomass within the study reach and respired during the next 24 hours. Ongoing work seeks to quantify differences in respiration lags among DOC sources.
- Biogeochemistry
- Models
- Ecosystem Dynamics
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Presenters/Authors
Robert O. Hall
(), Flathead Lake Biological Station, University of Montana, bob.hall@flbs.umt.edu;
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Michelle Baker
(), Utah State University, michelle.baker@usu.edu;
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Erin Hotchkiss
(), Virginia Tech, ehotchkiss@vt.edu;
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Stephen Plont
(), Virginia Tech, plontste@vt.edu;
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