National Forest Report for Region 4 (Intermountain)

The top ten species growing in National Forests in Region 4 (Intermountain) in terms of standing biomass are Douglas- fir, subalpine fir, lodgepole pine, Engelmann spruce, quaking aspen, ponderosa pine, grand fir, white fir, whitebark pine, and limber pine. These species account for 97.4% of the total aboveground biomass and 97.6% of the total merchantable volume. For merchantable wood volume, the species with the smallest percent change was grand fir -0.4%, while the largest percent change was with ponderosa pine 16.4%. For total aboveground biomass, the species with the smallest percent change was Douglas- fir 8.2%, while the largest percent change was with subalpine fir 29.5%. For sawlog wood volume, the species with the smallest percent change was Douglas- fir 1.4%, while the largest percent change was with ponderosa pine 20.4%. For merchantable bole biomass, the species with the smallest percent change was lodgepole pine -0.7%, while the largest percent change was with limber pine -28.7%. For stump wood and bark biomass, the species with the smallest percent change was whitebark pine 2.7%, while the largest percent change was with quaking aspen 19.3%. For top and limb biomass, the species with the smallest percent change was quaking aspen 34.1%, while the largest percent change was with limber pine 295.8%.

Figure 1: Percent difference in total aboveground biomass and merchantable volume for the top ten species in Region 4 (Intermountain)

Figure 2: Percent difference in component biomass and volume for the top ten species in Region 4 (Intermountain)