2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 2:00 PM - 3:30 PM | EFFECTS OF PARTICULATE ORGANIC CARBON (POC) ON MICROBIAL NUTRIENT UPTAKE IN FLUME LABORATORY EXPERIMENTS | Virtual Platform
EFFECTS OF PARTICULATE ORGANIC CARBON (POC) ON MICROBIAL NUTRIENT UPTAKE IN FLUME LABORATORY EXPERIMENTS
Rehabilitation of riparian forests may help to restore the natural in-stream nutrient uptake capacity via particulate organic carbon (POC) supply. This study investigated the effects of POC on the microbial uptake of phosphorus (P) and nitrogen (N) in laboratory flume experiments.
In the flumes, sand was colonized under nutrient-enriched conditions, half with optimum C:N:P ratios and half C limited, under dark and light. Undisturbed samples were taken out and incubated in nutrient-enriched water with fresh and leached leaves. Nutrient uptake rates were determined by changes in water column nutrient concentrations over time.
Preliminary results from dark flumes demonstrate that biofilms grown under optimal C:N:P conditions showed higher soluble reactive P uptake than those grown under C-limited conditions, with average rates of 8.1 and 4.1 µg/Lh in treatments with fresh and leached leaves, respectively. In addition, fresh leaves had stronger effects than leached ones. Fresh leaves stimulated nitrate uptake, with average rates of 70.9 and 50.2 µg/Lh under optimal and limited conditions, respectively, whereas leached leaves did not show any effects.
The results of this study will improve the mechanistic understanding of the stoichiometric control on the in-stream nutrient retention.
- Organic matter
- Rehabilitation
- Stoichiometry
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Presenters/Authors
Elmira Akbari
(), Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Vienna, Austria, elmira.akbari@wcl.ac.at;
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Gabriele Weigelhofer
(), Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Vienna, Austria, gabriele.weigelhofer@wcl.ac.at;
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