EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2018 | 11:30 AM - 11:45 AM | DISSOLVED ORGANIC MATTER DYNAMICS IN GRASSLAND STREAMS | 410 B
DISSOLVED ORGANIC MATTER DYNAMICS IN GRASSLAND STREAMS
Understanding the dynamics of dissolved organic matter (DOM) in streams is important for characterizing food webs and estimating global carbon budgets. However, not all DOM is the same and the composition of a given DOM molecule effects its eventual biogeochemical fate. The sheer quantity of different compounds that make up the DOM pool in streams makes it impractical to monitor all of them but some specific compounds can be detected relatively easily. We estimated the biological uptake of specific DOM compounds and classes in multiple grassland stream reaches across different seasons using glucose assays and fluorescence spectroscopy. From tracer experiments, we found that glucose and an amino acid-like component were consistently removed from the stream faster than two humic-like species. In addition, the humic-like species both remained elevated above background concentrations longer than the conservative tracer, indicating adsorption and re-release. Uptake calculations made using concentrations of specific compounds or components resulted in different parameters than those made using total dissolved organic carbon (TDOC) concentrations. This indicates that following the behavior of specific DOM components rather than TDOC could give more accurate results.
- Biogeochemistry
- Organic Matter
- Ecosystem
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Presenters/Authors
Sophie A. Higgs
(), Kansas State University, sahiggs@ksu.edu;
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Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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