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absence of fire acre Addition of sagebrush aspen Basal area bitterbrush bluebunch wheatgrass bunchgrass Bushey chokecherry conifer competition Cover percent curlleaf mountain-mahogany Deerlodge National Forest Douglas-fir seedlings fall burning feet high fescue habitat type Fire Effects fire intensity flammability Fuel loading lb/acre Grass and litter grass fuel grasslands invaded grazing Herb and shrub herbaceous plants herbaceous vegetation Idaho fescue increase Intermountain invaded by Douglas-fir junegrass Kind of Fire.—A Live shrub livestock lodgepole pine mi/h mineral soil Missoula moist Montana mountain big sagebrush pinegrass preburn levels prescribed burning prescribed fire PRESCRIPTION CONSIDERATIONS Resource prescription factors productivity of herbaceous rabbitbrush regeneration relative humidities RESPONSE POTENTIAL Richardson needlegrass rough fescue sapling/pole stage sapling2 No./acre seed Seedling and sapling2 serai grasslands snowbrush ceanothus sparse fuels species Spring burns squaw currant Strip head fires support fire spread sustained fire spread unburned areas ungulates VEGETATION CHARACTERISTICS Situation VEGETATION TREND western yarrow wildfire wildlife windspeed