National Forest Report for Region 3 (Southwestern)

The top ten species growing in National Forests in Region 3 (Southwestern) in terms of standing biomass are ponderosa pine, Douglas- fir, white fir, Engelmann spruce, quaking aspen, corkbark fir, southwestern white pine, blue spruce, limber pine, and Arizona cypress. These species account for 99.3% of the total aboveground biomass and 99.5% of the total merchantable volume. For merchantable wood volume, the species with the smallest percent change was corkbark fir 0%, while the largest percent change was with Arizona cypress 13.6%. For total aboveground biomass, the species with the smallest percent change was quaking aspen 8.7%, while the largest percent change was with blue spruce 29.7%. For sawlog wood volume, the species with the smallest percent change was white fir -1.4%, while the largest percent change was with quaking aspen -22.8%. For merchantable bole biomass, the species with the smallest percent change was limber pine -0.9%, while the largest percent change was with white fir 18.1%. For stump wood and bark biomass, the species with the smallest percent change was Douglas- fir 1.5%, while the largest percent change was with Arizona cypress 31.4%. For top and limb biomass, the species with the smallest percent change was quaking aspen 17.1%, while the largest percent change was with Arizona cypress 254.7%.

Figure 1: Percent difference in total aboveground biomass and merchantable volume for the top ten species in Region 3 (Southwestern)

Figure 2: Percent difference in component biomass and volume for the top ten species in Region 3 (Southwestern)