EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

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5/24/2018  |   2:30 PM - 2:45 PM   |  SYNTHESIZING RIPARIAN CONTROLS ON NITRATE EXPORT IN FORESTED AND URBAN TEMPERATE CATCHMENTS   |  310 A

SYNTHESIZING RIPARIAN CONTROLS ON NITRATE EXPORT IN FORESTED AND URBAN TEMPERATE CATCHMENTS

Catchment scale nitrogen export depends on the spatial and temporal heterogeneity of transformation and transport processes along flowpaths. Detailed study of nitrogen biogeochemistry in a temperate forested watershed in the Piedmont physiographic province has shown that denitrification occurring in narrow portions of the riparian zone (comprising less than 1% of catchment area) dominate denitrification fluxes at the watershed scale. However, such riparian zone processes are difficult to transfer to other watersheds, particularly to an urban watershed that has vastly different drivers of spatial and temporal heterogeneity. Long-term (20 years) of streamflow and stream nitrogen in both forested and urban catchments data show marked differences in seasonal timing and hydrologic controls in stream export patterns between sites. This work combines 3 years of high frequency in-stream data and high resolution spatial data to estimate riparian controls on the timing and magnitude of stream nitrogen fluxes in an urban watershed. We present an evolving conceptual model spanning terrestrial through aquatic ecosystem controls and integrates hydrologic, geomorphic, and ecologic perspectives.

  • Watershed
  • Biogeochemistry
  • Aquatic-terrestrial Linkage

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Presenters/Authors

Jon Duncan (), Penn State University, jmduncan@psu.edu;


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Claire Welty (), University of Maryland Baltimore County, weltyc@umbc.edu;


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