State Report for Idaho

For Idaho, estimated merchantable wood volume is expected to decrease from 47.238 billion cubic-feet to 47.167 billion (a change of -0.1%), while estimated sawlog wood volume is expected to increase from 37.716 billion cubic-feet to 39.06 billion (3.6%). Estimated merchantable bole biomass is expected to increase from 662.39 million tons to 665.33 million (0.4%), while estimated stump biomass is expected to decrease from 32.065 million tons to 27.899 million (-13%), and estimated tops and limbs biomass is expected to increase from 111.61 million tons to 199.77 million (79%). Finally, estimated aboveground biomass is expected to increase from 835.69 million tons to 928.11 million, a change of 11.1%.

Figure 1: Percent difference in volume and biomass for Idaho

Species breakdown

The top ten species in Idaho in terms of standing biomass are Douglas- fir, grand fir, lodgepole pine, subalpine fir, ponderosa pine, Engelmann spruce, western redcedar, western larch, western hemlock, and mountain hemlock. These species account for 96.4% of the total aboveground biomass and 96.9% of the total merchantable volume. For merchantable wood volume, the species with the smallest percent change was Douglas- fir -0.2%, while the largest percent change was with ponderosa pine 21.9%. For total aboveground biomass, the species with the smallest percent change was western larch 0.4%, while the largest percent change was with subalpine fir 28%. For sawlog wood volume, the species with the smallest percent change was grand fir 1.8%, while the largest percent change was with ponderosa pine 27.9%. For merchantable bole biomass, the species with the smallest percent change was subalpine fir -1.4%, while the largest percent change was with western larch 10.3%. For stump wood and bark biomass, the species with the smallest percent change was mountain hemlock 0.1%, while the largest percent change was with western larch -48.4%. For top and limb biomass, the species with the smallest percent change was western redcedar -4.1%, while the largest percent change was with subalpine fir 199.2%.

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

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