2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/08/2017 | 11:30 AM - 11:45 AM | PHOSPHORUS RETENTION IN SEDIMENTS OF TWO-STAGE AGRICULTURAL DITCHES | 306A
PHOSPHORUS RETENTION IN SEDIMENTS OF TWO-STAGE AGRICULTURAL DITCHES
Excess nutrients can contribute to eutrophication and can negatively impact ecosystems and the economy of surrounding communities. Phosphorus (P) and sediment inputs from agricultural drainage have facilitated the development of hypereutrophic conditions in Lake Macatawa in western Michigan. Two-stage ditches (TSDs), an agricultural best management practice, are being installed in the watershed in an attempt to trap nutrients and sediment. TSDs can effectively remove nitrogen through denitrification but less is known about their ability to retain P. This project assesses the effectiveness of TSDs at retaining P compared to corresponding upstream, traditional reaches within this watershed. Results show that sediments are the major sink of P despite variation in sediment total P. Sediment TP was higher in the traditional reaches compared to the two-stage reaches. The most abundant P fraction varied between Al- and Ca- bound P. Equilibrium P concentration values suggest sediment was more likely to retain P within the two-stage than the traditional reaches. The differences between reaches could be due to age and sediment type. Results will be used to inform management decisions within the watershed.
- C28 Land-Water Interfaces
- C24 Eutrophication
- C27 Landuse and Non-Point source Impacts
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Presenters/Authors
Alan Steinman
(), Annis Water Resources Institute-Grand Valley State University, steinmaa@gvsu.edu;
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Emily Kindervater
(), Annis Water Resources Institute- Grand Valley State University, kinderve@mail.gvsu.edu;
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