2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 10:00 AM - 10:15 AM | IT’S NOT EASY BEING GREEN: ASSESSING IMPACTS OF URBAN VEGETATION ON DOWNSTREAM NUTRIENT POLLUTION | 302A
IT’S NOT EASY BEING GREEN: ASSESSING IMPACTS OF URBAN VEGETATION ON DOWNSTREAM NUTRIENT POLLUTION
Increasing the presence of vegetation in cities could both improve living conditions for residents and mitigate negative impacts of urban runoff on aquatic ecosystems. However, the potential impact of increasing tree canopy cover and other green infrastructure on water quality are not well understood. We evaluated sources of nutrients to storm water using a combination of intensive data collection in a small watershed, elemental tracers and cross watershed comparisons in the Twin Cities of Minnesota. Time series analyses showed peaks in nitrogen and phosphorus corresponding to pulsed inputs from street trees. Tree inputs maintained high levels of organic nutrients on streets following municipal street sweeping and large rain events. Comparisons of storm water nutrient concentrations across varying levels of urban vegetation cover showed strong correlations between street canopy cover and nutrient concentration. The strong influence of urban vegetation on nutrient runoff presents challenges and opportunities to alter urban management to reduce nutrient losses to storm water. Such changes would provide the clear benefits associated with expansion of green infrastructure in cities, without increased eutrophication of downstream waters.
- C08 Urban Ecology
- C27 Landuse and Non-Point source Impacts
- S02 Urban streams, aquatic ecology, and stormwater engineering: How do we encourage integration, opportunities and collaboration in an era of green infrastructure innovation?
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Presenters/Authors
Jacques Finlay
(), University of Minnesota, jfinlay@umn.edu;
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Benjamin Janke
(), University of Minnesota, janke024@umn.edu;
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Sarah Hobbie
(), University of Minnesota, shobbie@umn.edu;
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