State Report for Arizona

For Arizona, estimated merchantable wood volume is expected to increase from 6.9689 billion cubic-feet to 7.0467 billion (a change of 1.1%), while estimated sawlog wood volume is expected to decrease from 6.1665 billion cubic-feet to 6.0004 billion (-2.7%). Estimated merchantable bole biomass is expected to increase from 102.02 million tons to 107.86 million (5.7%), while estimated stump biomass is expected to increase from 4.6565 million tons to 4.7069 million (1.1%), and estimated tops and limbs biomass is expected to increase from 17.682 million tons to 37.936 million (114.5%). Finally, estimated aboveground biomass is expected to increase from 127.22 million tons to 154.78 million, a change of 21.7%.

Figure 1: Percent difference in volume and biomass for Arizona

Species breakdown

The top ten species in Arizona in terms of standing biomass are ponderosa pine, Douglas- fir, quaking aspen, white fir, Engelmann spruce, southwestern white pine, blue spruce, Fremont cottonwood, corkbark fir, and Arizona cypress. These species account for 98.8% of the total aboveground biomass and 99% of the total merchantable volume. For merchantable wood volume, the species with the smallest percent change was corkbark fir 0.3%, while the largest percent change was with Arizona cypress 13.7%. For total aboveground biomass, the species with the smallest percent change was quaking aspen 11.4%, while the largest percent change was with Fremont cottonwood 38.8%. For sawlog wood volume, the species with the smallest percent change was Fremont cottonwood 0.9%, while the largest percent change was with quaking aspen -19.6%. For merchantable bole biomass, the species with the smallest percent change was Engelmann spruce -2.7%, while the largest percent change was with white fir 20.1%. For stump wood and bark biomass, the species with the smallest percent change was ponderosa pine -0.3%, while the largest percent change was with Arizona cypress 31.6%. For top and limb biomass, the species with the smallest percent change was quaking aspen 29.9%, while the largest percent change was with Arizona cypress 256.1%.

Figure 2: Percent difference in total aboveground biomass and merchantable volume for the top ten species in Arizona

Figure 3: Percent difference in component biomass and volume for the top ten species in Arizona