Historical wildfire impacts on ponderosa pine tree overstories: an Arizona case study
Peter F. Ffolliott, Cody L. Stropki, Daniel G. Neary, Rocky Mountain Research Station (Fort Collins, Colo.)
U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, 2008 - Nature - 20 pages
The Rodeo-Chediski Wildfire--the largest in Arizona's history--damaged or destroyed ecosystem resources and disrupted ecosystem functioning in a largely mosaic pattern throughout the ponderosa pine (Pinus ponderosa) forests exposed to the burn. Impacts of this wildfire on tree overstories were studied for 5 years (2002 to 2007) on two watersheds in the area burned. One watershed was burned by a high severity (stand-replacing) fire, while the other watershed was burned by a low severity (stand-modifying) fire. In this paper, we focus on the effects of the wildfire on stand structures, post-fire mortality of fire-damaged trees, and stocking of tree reproduction. We also present a fire severity classification system based on the fire-damaged tree crowns and a retrospective description of fire behavior on the two burned watersheds.
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acre alligator juniper Apache-Sitgreaves National Forest area burned Arizona basal area burned watersheds classification system based Crown-Damaged Trees cubic-foot volume cutting and fuel damaged trees dbh classes experienced a high Ffolliott fire severity classification fire-damaged trees ftVacre fuel reduction treatments fWacre Gambel oak high severity fire inches dbh initial impacts low severity fire mil-acre plots Moderate severity montane mortality of fire-damaged mortality of ponderosa Mountain Research Station Neary number of trees observed pine tree overstories plots were stocked point sampling ponderosa pine forests ponderosa pine reproduction ponderosa pine trees post-fire mortality pre-fire ponderosa pine Ridge Watershed burned Rocky Mountain Research Rodeo-Chediski Wildfire salvage cutting sample plots sawtimber classes severe crown damage severity classification system severity surface fire Stermer Ridge Watersheds stocking of tree tallied tree crowns tree mortality tree reproduction trees/acre U.S. Forest Service unburned University of Arizona watershed experiencing watershed exposed watershed was burned wildfire on stand Wildfire on tree