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Abies ABLA/CLUN allelopathic analysis Armillaria average bulldozers burned surface clearcut clones conifers Containerized crown ratio damage defoliation Department of Agriculture diameter differences Douglas-fir ectomycorrhizal elevation Engelmann spruce equations fireline forage Forest and Range Forest Service Forestry genetic geographic germination grand fir grazing habitat types inches Intermountain Research Station isolates litter surface livestock lodgepole pine Lubrecht measured mg/g mineral soil Montana in cooperation Multiple Single Multiple National Forest needle cast northern Idaho Ogden overstory percent Pinus Pinus contorta pinyon plant plots ponderosa pine populations production rates Range Experiment Station rangeland recovery regression Rehfeldt resilience resistance root samples seasons of trampling seed seedlings shelterwood Single Multiple Single slope class stachyose study area subalpine fir surface conditions survival temperatures tephra tion trampling intensity treatment trees U.S. Department uncut understory University University of Idaho variables vegetation cover volume western hemlock western larch western white pine