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Guide to fuel treatments in dry forests of the Western United States: assessing forest structure and fire hazard

Author(s): Morris C. Johnson, David L. Peterson, Crystal L. Raymond
Year Published: 2007
Description:

Guide to Fuel Treatments analyzes a range of fuel treatments for representative dry forest stands in the Western United States with overstories dominated by ponderosa pine (Pinus ponderosa), Douglas-fir (Pseudotsuga menziesii), and pinyon pine (Pinus edulis). Six silvicultural options (no thinning; thinning from below to 50 trees per acre [tpa], 100 tpa, 200 tpa, and 300 tpa; and prescribed fire) are considered in combination with three surface fuel treatments (no treatment, pile and burn, and prescribed fire), resulting in a range of alternative treatments for each representative stand. The Fire and Fuels Extension of the Forest Vegetation Simulator (FFE-FVS) was used to calculate the immediate effects of treatments on surface fuels, fire hazard, potential fire behavior, and forest structure. The FFE-FVS was also used to calculate a 50-year time series of treatment effects at 10-year increments. Usually, thinning to 50 to 100 tpa and an associated surface fuel treatment were shown to be necessary to alter potential fire behavior from crown fire to surface fire under severe fire weather conditions. This level of fuel treatment generally was predicted to maintain potential fire behavior as surface fire for 30 to 40 years, depending on how fast regeneration occurs in the understory, after which additional fuel treatment would be necessary to maintain surface fire behavior. Fuel treatment scenarios presented here can be used by resource managers to examine alternatives for National Environmental Policy Act documents and other applications that require scientifically based information to quantify the effects of modifying forest structure and surface fuels.

Citation: Johnson, Morris C.; Peterson, David L.; Raymond, Crystal L. 2007. Guide to fuel treatments in dry forests of the Western United States: assessing forest structure and fire hazard. Gen. Tech. Rep. PNW-GTR-686. Portland, OR: USDA Forest Service, Pacific Northwest Research Station. 322 p.
Topic(s): Fire Behavior, Fire Prediction, Simulation Modeling, FVS, Fire Effects, Fire Policy & Law, Fuels, Fuel Treatments & Effects, Mechanical treatments, Prescribed Fire-use treatments, Management Approaches, National Environmental Policy and Review Act (EPA)
Ecosystem(s): Montane dry mixed-conifer forest, Ponderosa pine woodland/savanna, Juniper woodland
Document Type: Technical Report or White Paper
NRFSN number: 11166
FRAMES RCS number: 677
Record updated: Sep 11, 2018