2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/08/2017 | 12:15 PM - 12:30 PM | VARIABILITY IN SOURCES AND FATES OF NITROGEN AND PHOSPHORUS IN CATCHMENTS OF THE OHIO RIVER BASIN | 306A
VARIABILITY IN SOURCES AND FATES OF NITROGEN AND PHOSPHORUS IN CATCHMENTS OF THE OHIO RIVER BASIN
Nutrient enrichment and the rise in frequency of harmful algal blooms in inland aquatic ecosystems is a growing concern. Here, we assess nutrient loading of streams and their receiving reservoirs across a range of urban, forested, and agricultural land-cover types. Forty-five stream and nine reservoir sites distributed across three study catchments of southern/central Ohio were surveyed for nutrients in the summer and fall of 2016. Initial data suggest that streams in the forested catchment exhibit the lowest average total phosphorus, orthophosphate, total nitrogen, and nitrate, whereas streams in urban- and crop-dominated catchments support similar nutrient concentrations. For reservoirs, total phosphorus was similar in all three catchments, orthophosphate was highest in the crop-dominated catchment, and total nitrogen and nitrate concentrations were highest in the urban-dominated catchment. Further, equilibrium values and oxygen isotope signatures of dissolved phosphate support the use of mixing models to identify sources of phosphorus. We anticipate that this work will contribute to current understanding of nutrient dynamics in inland waters, particularly in non-agricultural landscapes of the Ohio River basin.
- C10 Biogeochemistry
- C24 Eutrophication
- C27 Landuse and Non-Point source Impacts
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Presenters/Authors
Kay C. Stefanik
(), The Ohio State University, stefanik.13@osu.edu;
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S. Mažeika Patricio Sulliván
(), The Ohio State University, sullivan.191@osu.edu;
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Lauren M. Pintor
(), The Ohio State University, pintor.6@osu.edu;
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Kaiguang Zhao
(), The Ohio State University, zhao.1423@osu.edu;
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