EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 3:00 PM - 3:15 PM | EVIDENCE FOR PRIMING: LIGHT DEGRADED DISSOLVED ORGANIC MATTER INCREASED THE DECAY RATE OF TERRESTRIAL ORGANIC MATTER IN EXPERIMENTAL STREAMS | 306A
EVIDENCE FOR PRIMING: LIGHT DEGRADED DISSOLVED ORGANIC MATTER INCREASED THE DECAY RATE OF TERRESTRIAL ORGANIC MATTER IN EXPERIMENTAL STREAMS
Dissolved organic matter (DOM) is the largest pool of organic matter (OM) in aquatic systems and mediates all microbial processes. Biogeochemists have described priming, the process when additions of labile OM accelerate decomposition of semi-labile OM. We tested for priming of terrestrial, semi-labile DOM in 8 experimental streams and dark bottles. Decay of 2 forms of semi-labile DOM, soil leachate and plant leachate, 2 forms of labile DOM, algal leachate and light degraded semi-labile DOM, and a mixture of labile and semi-labile DOM were measured. Decay rates of soil leachate were too low to measure and plant leachate decay averaged 0.011/hr in streams and 0.001/hr in bottles (S.D. 0.002/hr ; 0.001/hr). Algal leachate decay averaged 0.025/hr in streams and 0.005/hr in bottles (S.D. 0.021/hr ; 0.002/hr). When algal leachate was mixed with semi-labile plant leachate decay rates were similar to plant leachate alone. However, when light-degraded plant leachate was added to semi-lable leachate, decay rates were greater than plant leachate alone. We concluded exposure to light increased lability of terrestrially derived DOM, and could increase consumption rates of non-labile DOM.
- C31 Organic Matter Processing
- C04 Microbial Ecology
- C10 Biogeochemistry
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Presenters/Authors
Julie Kelso
(), ORISE Environmental Protection Agency, julia.kelso@gmail.com;
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Michelle Baker
(), Utah State University, michelle.baker@usu.edu;
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Emma Rosi
(), Cary Institute of Ecosystem Studies, rosie@caryinstitute.org;
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