2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 3:15 PM - 3:30 PM | OPENING THE BIOGEOCHEMICAL BLACK BOX: NUTRIENT REMOVAL IN A GREAT LAKES COASTAL WETLAND (OLD WOMAN CREEK, OH) AT WHOLE-ECOSYSTEM AND MECHANISTIC SCALES | 420 B
OPENING THE BIOGEOCHEMICAL BLACK BOX: NUTRIENT REMOVAL IN A GREAT LAKES COASTAL WETLAND (OLD WOMAN CREEK, OH) AT WHOLE-ECOSYSTEM AND MECHANISTIC SCALES
Wetlands, in particular along Great Lakes coasts, are valued for their nutrient removal capabilities. However, the ability to demonstrate whole-ecosystem nutrient removal by mass balance is limited in natural wetlands. In one of few remaining intact freshwater estuary wetlands along the Lake Erie coast (Old Woman Creek, Huron, OH), we calculate whole-ecosystem annual nutrient mass balance. In parallel, we assess indicators of nutrient removal processes (P fractionation, denitrification assays) in eight hydrologically and ecologically distinct zones (“ecozones”) to understand the biogeochemical mechanisms underlying whole-ecosystem accounting. For the October 2016-September 2017 water year, mass balance calculations indicate net removal of nutrient forms including total phosphorus, soluble reactive phosphorus, nitrate-nitrogen, and total kjeldahl nitrogen. The relative distribution of sediment P among chemical forms varied among ecozones, and the magnitude of easily mobilized fractions was seasonally variable. Potential denitrification was highest in vegetated ecozones with highly organic soils, and actual denitrification was highest in spring when nitrate loading was high. Continued work in future years combining whole-ecosystem monitoring with spatially resolved mechanistic studies will provide insights into how hydrologic change in Great Lakes coastal wetlands will shape their biogeochemical function.
- Wetland
- Biogeochemistry
- Nutrients
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Presenters/Authors
Lauren Kinsman-Costello
(), Kent State University, lkinsman@kent.edu;
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Bree Richardson
(), Kent State University, bricha34@kent.edu;
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Kristin Arend
(), Ohio Department of Natural Resources, kristin.arend@dnr.state.oh.us;
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Laura Johnson
(), Heidelberg University, ljohnson@heidelberg.edu;
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