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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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| Type: | Resource | |
| Storage: | The size of this resource is 99.4 KB | |
| Created: | Oct 31, 2021 at 12:36 a.m. | |
| Last updated: | Oct 31, 2021 at 12:20 p.m. | |
| DOI: | 10.4211/hs.4478fc64e802496d86badefffe809ab4 | |
| Citation: | See how to cite this resource |
| Sharing Status: | Published |
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| Views: | 1712 |
| Downloads: | 2 |
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Abstract
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.
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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
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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