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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,

This resource is shared under the Creative Commons Attribution CC BY.


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