2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 3:00 PM - 3:15 PM | SHORT-TERM IMPACTS OF PHRAGMITES MANAGEMENT ON NUTRIENT RETENTION IN LAKE ERIE COASTAL MARSHES | 420 B
SHORT-TERM IMPACTS OF PHRAGMITES MANAGEMENT ON NUTRIENT RETENTION IN LAKE ERIE COASTAL MARSHES
Invasive plant management is a key focus of wetland managers, and considerable resources are devoted to control of non-native Phragmites australis in many Great Lakes coastal wetlands. This study examined short-term impacts of herbicide management by comparing changes in wetland plant productivity, nutrient availability, and plant communities before and after herbicide treatment in two coastal wetlands. In the year after treatment, annual aboveground net primary production and plant nitrogen and phosphorus uptake decreased dramatically (by an average of 88%, 80% and 89% respectively; p < 0.05), and some, but not all, porewater and surface water nutrients increased significantly. Despite large reductions in Phragmites biomass following herbicide treatment, short-term floristic quality did not improve. When scaled to the area surrounding Lake Erie’s Western Basin treated with herbicide in 2012, plant nutrient uptake was reduced by 159 mt nitrogen and 24 mt phosphorus. This amount, potentially available for export to coastal waters, was small relative to average annual riverine loading but similar in magnitude to 2012 summer loading (57% of total nitrogen and 478% of SRP loading from the Maumee River). Our results highlight the trade-offs inherent in managing invasive plants.
- Trade-offs
- Wetland
- Restoration
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Presenters/Authors
Kristi Judd
(), Eastern Michigan University, kjudd2@emich.edu;
ASHA DISCLOSURE:
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Steven Francoeur
(), Eastern Michigan University, sfrancoeu@emich.edu;
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