2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 11:15 AM - 11:30 AM | MICROBIAL PROCESSING CONDITIONS DISSOLVED ORGANIC MATTER FROM URBAN ENGINEERED HEADWATERS | 310 A
MICROBIAL PROCESSING CONDITIONS DISSOLVED ORGANIC MATTER FROM URBAN ENGINEERED HEADWATERS
The impervious channels that act as headwaters in urban stream networks (e.g. roof and roadside gutters, stormwater pipes) can be collection points of leaves and other organic matter that is readily leached and transported downstream during storms, where it can impact ecological function of the aquatic ecosystem. We collected dissolved organic matter (DOM) from urban headwater stormflow and leachate from potential organic matter sources in an urban catchment. We incubated these samples with a common inoculum and measured decrease in dissolved organic carbon (DOC) concentration to determine lability to microbial degradation. We paired these observations with measurements of the optical properties of the DOM pool. On average, 51.4% of the DOC was mineralized after 60 days of incubation, concurrent with increases in SUVA-254 and HIX. EEM-PARAFAC analysis indicated decreases in a protein-like peak and relative increases in humic-like peaks. Our data also show that DOM composition undergoes transient increases in chemodiversity during processing. This suggests that microbial processing generates new compounds prone to degradation later in the experiment - i.e. microbe-driven changes to DOM composition early in incubation conditions DOM for mineralization later in the incubation.
- Organic Matter
- Carbon
- Microbial
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Presenters/Authors
Megan Fork
(), Cary Institute of Ecosystem Studies, forkm@caryinstitute.org;
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Christopher Osburn
(), North Carolina State University - Department of Marine, Earth and Ocean Sciences, closburn@ncsu.edu;
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Jim Heffernan
(), Duke University, james.heffernan@duke.edu;
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