2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/20/2019 | 10:00 AM - 10:15 AM | EVENT-SCALE RIVERINE LOADING OF NITROGEN AND PHOSPHORUS: IMPACTS OF LAND USE AND SEASONALITY ON N:P EXPORT RATIOS | 250 AB

EVENT-SCALE RIVERINE LOADING OF NITROGEN AND PHOSPHORUS: IMPACTS OF LAND USE AND SEASONALITY ON N:P EXPORT RATIOS

Riverine nutrient loads, particularly during high flows, impact ecological processes in receiving waterbodies by altering nutrient concentrations and ratios. Given that nitrogen (N) to phosphorus (P) ratios influence a range of processes, and that anthropogenic activities are shifting the balance of these elements, it is important to understand N and P loading patterns across space and time. While general differences in N and P provenance and riverine loading dynamics are well-established, drivers of variability in intra- and inter-event loading patterns remains poorly understood. Yet these events tend to dominate annual nutrient loads in many climates. With the advent of in situ sensors and novel algorithms to predict N and P concentrations concurrently, opportunity exists to examine event-scale N and P loading patterns. Here we use high-frequency N and P measurements for >350 events, over 5 years, across land uses to quantify riverine N and P loading and N:P export ratios. Initial results demonstrate the importance of event contributions to annual loads for both nutrients, and variability in concentration-discharge relationships for N and P across event sizes, land uses, and seasons that drive important differences in N:P export ratios.

Phosphorous
Stoichiometry
Landuse

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Presenters/Authors

Dustin Kincaid (), University of Vermont, dustin.kincaid@uvm.edu;