2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2019 | 10:15 AM - 10:30 AM | FROM LAWNS TO THE STREAM: HOTSPOTS OF NITROGEN TRANSPORT IN RESIDENTIAL LAWNS IN BALTIMORE, MD | 251 AB

FROM LAWNS TO THE STREAM: HOTSPOTS OF NITROGEN TRANSPORT IN RESIDENTIAL LAWNS IN BALTIMORE, MD

Residential landscapes are typically considered exporters of nitrogen into urban streams. Consequently, these landscapes have been targets of various mitigation strategies, such as reducing fertilizer use or disconnecting downspouts, to minimize their impact on urban streams. However, watershed scale studies have found that some residential areas retain more nitrogen than expected, but it is unclear why. Nitrogen transport in lawns is affected by many factors, such as its hydrology, biogeochemistry, topography, and homeowner management. For this study, we examined if simple measures of hydrology (saturated infiltration rates) and biogeochemistry (denitrification rates) would predict where hotspots of nitrogen transport occur within lawns with different fertilizer regimes. Further, we examined if the spatial arrangement of hotspots of nitrogen transport within lawns could contribute to export of nitrogen off lawns and onto impervious surfaces. Nitrogen transport was quantified using experimental rainfalls at 48 locations in 11 lawns, in which we measured nitrate and ammonium in runoff and leachate. We found that fertilizer use is the best predictor of nitrate in runoff. We also found locations adjacent to impervious surfaces had lower saturated infiltration rates, making these potential hotspots for nitrogen transport off lawns.

Urban
Nitrogen
Hydrology

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Presenters/Authors

Amanda Suchy (), City University of New York, suchya@caryinstitute.org;