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|Created:||Nov 14, 2019 at 8:47 p.m.|
|Last updated:|| Nov 15, 2019 at 3:07 p.m.
|Citation:||See how to cite this resource|
|Content types:||Single File Content|
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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.
|This resource updates and replaces a previous version||Rodriguez-Cardona, B., A. A. Coble, A. Wymore, R. Kolosov, D. C. Podgorski, P. Zito, R. G. Spencer, A. S. Prokushkin, W. McDowell (2018). Differential effects of biomass burning on carbon and nutrient dynamics in Arctic fluvial ecosystems, HydroShare, https://doi.org/10.4211/hs.5af38c0096014e3c96adecb92bc6e26d|
This resource was created using funding from the following sources:
|Agency Name||Award Title||Award Number|
|National Science Foundation||National Science Foundation Division of Chemistry||DMR-1644779|
|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|
|Russian Science Foundation (RSF)||Landscape and hydrobiological controls on the transport of terrigenic carbon to the Arctic Ocean||#18-05-60203|