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After the Storm: Fate and leaching of particulate nitrogen (PN) in the fluvial network and the influence of watershed sources and moisture conditions

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Created: Oct 31, 2021 at 12:36 a.m.
Last updated: Oct 31, 2021 at 12:20 p.m.
DOI: 10.4211/hs.4478fc64e802496d86badefffe809ab4
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Sharing Status: Published
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Large storms can erode, transport, and deposit substantial amounts of particulate ni-trogen (PN) in the fluvial network. The fate of this input and its consequence for water quality is poorly understood. This study investigated the transformation and leaching of PN using a 56-day incubation experiment with five PN sources: forest floor humus, upland mineral A hori-zon, stream bank, storm deposits, and stream bed. Experiments were subjected to two moisture regimes: continuously moist and dry-wet cycles. Sediment and porewater samples were collected through the incubation and analyzed for N and C species, and quantification of nitrifying and denitrifying genes (amoA, nirS, nirK). C and N rich watershed sources experienced decomposi-tion, mineralization, and nitrification and released large amounts of dissolved N, but the amount of N released varied by PN source and moisture regime. Drying and rewetting stimulated nitri-fication and suppressed denitrification in most PN sources. Storm deposits released large amounts of porewater N regardless of the moisture conditions, indicating that they can readily act as N sources under a variety of conditions. The inputs, processing, and leaching of large storm-driven PN inputs become increasingly important as the frequency and intensity of large storms is predicted to increase with global climate change.

Subject Keywords



Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Fair Hill, MD



Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
USDA NIFA grant 2015-67020-23585
Stroud Water Research Center Research Endowment

How to Cite

Krieg, C., E. Johnson, E. K. Peck, J. Kan, s. inamdar (2021). After the Storm: Fate and leaching of particulate nitrogen (PN) in the fluvial network and the influence of watershed sources and moisture conditions, HydroShare,

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