2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/24/2018 | 3:00 PM - 3:15 PM | MANAGEMENT OPTIONS FOR WATER QUALITY IMPROVEMENT IN THE MINNESOTA RIVER BASIN | 330 B

MANAGEMENT OPTIONS FOR WATER QUALITY IMPROVEMENT IN THE MINNESOTA RIVER BASIN

Nutrient enrichment from agricultural activities drives widespread eutrophication of freshwater ecosystems. Despite substantial efforts to increase nitrogen and phosphorus retention in managed landscapes of the Midwest, little progress has been made in reversing eutrophication. This talk describes research to define sources of nutrient losses from agricultural watersheds in southern Minnesota to identify management actions that will be effective for achieving local water quality improvement via reduction in nutrient concentrations and loads. Nitrogen (N) and phosphorus (P) losses were linked primarily to fertilizer inputs to watersheds, but their transport pathways to rivers diverged. Tile drainage was the dominant source of N loss, but near channel sources were the major sources of particulate and dissolved from erosion and diffuse non point sources. Remnant wetlands and shallow lakes were strong sinks for N, and did not appear to contribute strongly to P losses. Due to their role in reducing N loads and controlling downstream erosion, expansion of wetland cover could help efficiently control both N and P losses. Synthesizing recent information, we examine potential restoration and management changes that will be most effective for comprehensive water quality improvement in this watershed.

Landuse
Water Quality
Wetland

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Presenters/Authors

Jacques Finlay (), University of Minnesota, jfinlay@umn.edu;