While forest residues, wood from fuel reduction forest management practices, and mill wastes are included in the analysis, the potential for forestry is understated in this analysis. Standing timber is not incorporated into the potential supplies of cellulosic materials (Figure 5).
Much of the land that is suitable for timber may not be suitable for dedicated energy crops such as switchgrass. In the South where pulpwood stumpage fees are on the decline and an additional market for these managed forests is being sought, this acreage will likely play a role in meeting the nation's renewable energy needs. Because of limitations in the model and data related to forestry, no standing trees were used to meet the renewable energy goal. With 33 percent of the United States' land area in forests and with 58 percent of the forest land in nonindustrial private land ownership, the use of such for energy conversion would, of course, impact the degree of change in crop acreages and, no doubt, other study outcomes.
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