. West fork of Swift Creek timber sale project final environmental impact statement . Forest reserves; Logging; Logging; Environmental impact statements; Harvesting. VEGETATION ANALYSIS and primarily limited to Engelmann spruce and subalpine fir. FIRE REGIMES The project area is primarily represented by Fire Group 9 Fire Regime (87 percent of gross acreage), as described by Fisher/Bradley. Fire Group 9 represents moist, lower subalpine habitat types where fires are infreguent, but severe, and the effects are long lasting. Stand- replacing fires have been estimated to occur at moderately long t
. West fork of Swift Creek timber sale project final environmental impact statement . Forest reserves; Logging; Logging; Environmental impact statements; Harvesting. VEGETATION ANALYSIS and primarily limited to Engelmann spruce and subalpine fir. FIRE REGIMES The project area is primarily represented by Fire Group 9 Fire Regime (87 percent of gross acreage), as described by Fisher/Bradley. Fire Group 9 represents moist, lower subalpine habitat types where fires are infreguent, but severe, and the effects are long lasting. Stand- replacing fires have been estimated to occur at moderately long to long intervals, 150 to 300 years. The project area also has minor representation in Fire Groups 10 (8 percent), 8 (5 percent), and 7 (less than 1 percent) . The size of the fires in Fire Group 9 will vary from small (in the less severe fire conditions) to large and catastrophic (in the more severe fire conditions that have been experienced in the past few years). In the more severe fire conditions, thousands of acres burn in stand- replacement fires .. The incidence of bark beetle attacks Is on the rise In the project area. The next most common fire regime in the project area is Fire Group 10, which is characterized by the high- elevation forests near and at timberline. Some stands in Harvest Area III are in this regime. Stand- replacing fires, even in the more continuous forests, range in freguency to more than 300 years. ALTERNATIVE EFFECTS COVERTYPES AND AGE CLASSES Direct and Indirect Effects • Of reef andIndireef Effeets qfJVo-^leffon Jltterimttre«I to Corertypes and. lye Classes Covertypes on Stillwater State Forest would not be affected. Older age classes would continue to increase. • Of reef and Indireef Effeets ofvletton vltternatieeB to Corertypes and .lye Classes Approximately 138 acres of the mixed-conifer covertype would likely be converted to a western larch/Douglas-fir covertype by planting western larch in some areas and harvesting subalpine fir and Engel
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