Home
A JFSP Fire Science Exchange Network
Bringing People Together & Sharing Knowledge in the Northern Rockies

Fire and floods: The recovery of headwater stream systems following high-severity wildfire

Author(s): Jackson M. Leonard, Hugo A. Magana, Randy K. Bangert, Daniel G. Neary, Willson L. Montgomery
Year Published: 2017
Description:

This study examined the recovery of both physical and biotic characteristics of small (<0.1 m3 sec-1) headwater stream systems impacted by the Dude Fire, which occurred in central Arizona, USA, in 1990. Data collected prior to the fire from 1986 to1988 was compared to similar data collected at various points after the fire though 2011 in order to assess changes in the geomorphology and macroinvertebrate communities over the 21-year time period. Additionally, several environmental parameters of the impacted streams were compared to neighboring unburned headwater streams in order to determine recovery status. The study hypothesized that the headwater aquatic ecosystems impacted by the Dude Fire have yet to recover to unburned reference conditions. Results show that flooding, which occurred following the fire, resulted in incision in excess of 0.5 m across some stream transects and is continuing to cause shifts in dominant substrate particle size. Macroinvertebrate richness, diversity, and abundance were altered from prefire conditions up to a decade after the fire. Streamside canopy cover across burned streams remained 28% lower on average. Lower concentrations of key stream nutrients, including nitrate (NO3 -) and phosphate (PO4 3-), within impacted streams are still evident. Increases in summer stream temperatures due to the loss of streamside canopy cover continue to have an adverse affect on salmonid habitat. Thus, the process of recovery is closely tied to streamside vegetation and hydrologic disturbance patterns following the fire event, and will extend beyond the 21- year time period of this study.

Citation: LeonardJM, Magana HA, BangertRK, NearyDG, and Montgomery WL. 2017. Fire and floods: The recovery of headwater stream systems following high-severity wildfire. Fire Ecology 13 (3), p. 62-84. doi: 10.4996/fireecology.130306284
Topic(s): Fire Effects, Ecological - Second Order, Water
Ecosystem(s): None
Document Type: Book or Chapter or Journal Article
NRFSN number: 16326
Record updated: Dec 26, 2017