Exports of dissolved ammonium (NH4
+) during storm events across multiple catchments in a glaciated forested watershed |
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Authors: | Shreeram Inamdar |
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Institution: | (1) University of Delaware, Bioresources Engineering, 260 Townsend Hall, 531 S College Avenue, Newark, DE 19716, USA |
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Abstract: | Storm event exports of dissolved were explored for multiple events in the Point Peter Brook watershed (PPBW), a glaciated, forested watershed located in Western
New York, USA. Investigations were performed across four catchments (1.6–696 ha) with varying topography and the extent of
surface-saturated areas. While wetland and riparian waters were important sources of during non-storm periods, throughfall and litter leachate were the dominant contributors of during storm events. Ammonium concentrations in catchment discharge displayed a sinusoidal seasonal pattern with a maximum
during early spring (March) and a minimum in late summer (August–September). Storm event concentrations of in streamflow were much greater than baseflow values and showed a consistent temporal pattern with an increase in concentrations
on the hydrograph rising limb, a peak at or before the discharge peak, followed by a decline in concentrations. Storm event
patterns of DON were similar to while the patterns of differed from for the summer and fall events. The storm event expression of was attributed to throughfall and throughfall-mediated leaching of the litter layer. The reactive behavior of precluded its use in an end member mixing model (EMMA) for predicting streamflow concentrations. While concentrations of
in precipitation and streamflow were high for the spring events, exports of in streamflow were highest for the large and intense storm events. Baseflow concentrations increased with the percent wetland/saturated area in the catchment but the same trend did not hold for storm-event
concentrations. |
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Keywords: | Nitrogen Throughfall Litter layer Wetland EMMA Hydrochemistry |
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