After fires there is concern about ash, fire debris, flooding, “emergency” sediment. These effects are catastrophic, but relatively short lived
Post-fire watershed response domains (Moody et al. 2013) - see figure
After Lost Creek fire, snowpack snow water equivalent increased with fire, as did net rainfall and net precipitation
For Lost Creek, there was very little effect of fire on peak flows; however, there was earlier melt runoff.
In Lost Creek area, impact of fire on stream temperature is minimal, mainly because stream temperature is groundwater controlled. However, there were large effects on water quality (sediment concentration and phosphorus concentration increases were persistent throughout 10 years; Nitrogen concentrations drop below baseline after 6 years post-burn)
Post fire, increased sediment, which increased bioavailable phosphorus. The macroinvertebrate community then increased in abundance, which led to increased growth of trout
Similar mechanisms and processes govern responses, but different processes dominate responses across biogeoclimatic regions. Caution in broad generalizations on scope of fire effects to water resources
This media record is part of a series:
Crown of the Continent Forum 2021
The Crown Managers Partnership partnered with the Northern Rockies Fire Science Network and others to bring you the 2021 Fire in the Crown of the Continent Forum, which was held virtually from March 22nd to March 26th.
The Crown Managers Partnership is a multi-jurisdictional partnership among federal, state, provincial, tribal, and first nation agency managers and universities in Montana, Alberta, and British Columbia. Annual forums facilitate networking opportunities, build collaboration, and deepen understanding of common issues in the Crown of the Continent Ecosystem.
View the Forum Report (in the Files block) with summaries from presentations and special sessions (published November 2021).
Media Record Details
Mar 26, 2021
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Cataloging Information
Aquatic Life
Water
Fish