State Report for Iowa

For Iowa, estimated merchantable wood volume is expected to increase from 4.9885 billion cubic-feet to 5.2006 billion (a change of 4.3%), while estimated sawlog wood volume is expected to increase from 2.4493 billion cubic-feet to 2.6677 billion (8.9%). Estimated merchantable bole biomass is expected to decrease from 91.241 million tons to 88.725 million (-2.8%), while estimated stump biomass is expected to increase from 5.087 million tons to 5.6846 million (11.7%), and estimated tops and limbs biomass is expected to increase from 21.193 million tons to 51.23 million (141.7%). Finally, estimated aboveground biomass is expected to increase from 120.02 million tons to 148.58 million, a change of 23.8%.

Figure 1: Percent difference in volume and biomass for Iowa

Species breakdown

The top ten species in Iowa in terms of standing biomass are silver maple, white oak, bur oak, black walnut, northern red oak, hackberry, shagbark hickory, American elm, eastern cottonwood, and American basswood. These species account for 67.1% of the total aboveground biomass and 68.2% of the total merchantable volume. For merchantable wood volume, the species with the smallest percent change was American elm 0%, while the largest percent change was with shagbark hickory 30.1%. For total aboveground biomass, the species with the smallest percent change was eastern cottonwood -1.3%, while the largest percent change was with hackberry 51.8%. For sawlog wood volume, the species with the smallest percent change was eastern cottonwood -0.7%, while the largest percent change was with white oak 25.5%. For merchantable bole biomass, the species with the smallest percent change was northern red oak -2.5%, while the largest percent change was with bur oak -23.7%. For stump wood and bark biomass, the species with the smallest percent change was black walnut -0.7%, while the largest percent change was with American basswood 47.1%. For top and limb biomass, the species with the smallest percent change was eastern cottonwood 72.7%, while the largest percent change was with silver maple 357.6%.

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

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