1 percent of total trees represented by each species group2 soft maple/birch3 aspen/alder/cottonwood/willow4 hard maple/oak/hickory/beech5 other hardwood6 cedar/larch7 spruce8 pine, β0 and β1 are parameters used in biomass equations for estimating total aboveground biomass for hardwood and softwood species in the United States.
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