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acre alpha diversity bell-shaped curves burn coefficient Column Concave-Upward control points cover/forage crop trees crop-tree Department of Agriculture descriptor differences diversity indices Douglas-fir estimates evaluation fire Forest and Range Forest Service function graphed hypothesis growth habitat habitat type height hypothesis development Idaho inches infested Interacting intercept Jensen ldaho lntermountain Forest lodgepole pine measured metric mined land Missoula mountain pine beetle nontimber resources Ogden overlay curve Pattee Canyon peak percent Physocarpus malvaceus plant postfire processed oil shale processed shale Range Experiment Station reference area revegetated area rhizomes road models Roan Plateau sample scale seeded grasses seedlings segments shrubs sigmoid slope soil species Standards study area subunits terpene thinned plots timber sales tion topsoil transects tree loss Tsig U.S. Department understory University of Montana unthinned plots upland sites USDA Utah variables vegetation western larch wildlife zero