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Wildfires lead to decreased carbon and increased nitrogen concentrations in upland arctic streams


An older version of this resource http://www.hydroshare.org/resource/5af38c0096014e3c96adecb92bc6e26d is available.
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Resource type: Composite Resource
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Created: Nov 14, 2019 at 8:47 p.m.
Last updated: Nov 15, 2019 at 3:07 p.m.
DOI: 10.4211/hs.992d96e406fd4c67b90c016f1c187ac5
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Content types: Single File Content 
Sharing Status: Published
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Abstract

The Central Siberian Plateau (CSP) is undergoing rapid climate change that has resulted in increased frequency of forest fires and subsequent alteration of watershed carbon and nutrient dynamics. Across a watershed chronosequence (3 to >100 years since wildfire) we quantified the effects of fire on quantity and composition of dissolved organic matter composition (DOM), stream water nutrients concentrations, as well as in-stream nutrient uptake. Wildfires increased concentrations of nitrate for a decade, while decreasing concentrations of dissolved organic carbon and nitrogen (DOC and DON) and aliphatic DOM contribution for five decades. These post-wildfire changes in stream DOM result in lower uptake efficiency of in-stream nitrate in recently burned watersheds. Nitrate uptake (as uptake velocity) is strongly dependent on DOM quality (e.g. polyphenolics), ambient dissolved inorganic nitrogen (DIN), and DOC to DIN ratios. Our observations and experiments suggest that a decade-long pulse of inorganic nitrogen and a reduction of DOC export occur following wildfires in streams draining the CSP. Increased fire frequency in the region is thus likely to both decrease DOM and increase nitrate delivery to the main stem Yenisei River, and ultimately the Arctic Ocean, in the coming decades.

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Tura, Krasnoyarsk Krai Region, Russia
Longitude
100.1966°
Latitude
64.2877°

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Start Date:
End Date:

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References

Related Resources

This resource updates and replaces previous version: http://www.hydroshare.org/resource/5af38c0096014e3c96adecb92bc6e26d

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
National Science Foundation Crossing the boundaries of Critical Zone science with a virtual institute (SAVI) ICER 14-45246
National Science Foundation Deciphering the role of dissolved organic nitrogen in stream nutrient cycling DEB-1556603
Russian Foundation for Basic Research (RFBR) Small catchments within the continuous permafrost zone of Central Siberia: the role of wildfire and forest succession in stream biogeochemistry #14-05-00420
National Science Foundation National Science Foundation Division of Chemistry DMR-1644779
Russian Science Foundation (RSF) Landscape and hydrobiological controls on the transport of terrigenic carbon to the Arctic Ocean #18-05-60203

How to Cite

Rodriguez-Cardona, B., A. A. Coble, A. Wymore, R. Kolosov, D. C. Podgorski, P. Zito, R. G. Spencer, A. S. Prokushkin, W. McDowell (2019). Wildfires lead to decreased carbon and increased nitrogen concentrations in upland arctic streams, HydroShare, https://doi.org/10.4211/hs.992d96e406fd4c67b90c016f1c187ac5

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

 http://creativecommons.org/licenses/by/4.0/
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