Characteristics of Logging Residues from Oregon Old-Growth Stands

Samples of logging residues removed at two utilization levels, 4-inch by 4-foot and 6-inch by 6-foot minimum size limits, from the Mt. Hood and Willamette National Forests in Oregon were analyzed to determine species, moisture content, specific gravity, percentage of pieces with heavy decay, higher heating values, ash content, and proportion of wood to bark. Removal to the smaller size specification yielded an extra 15 dry tons per acre of residues and a 0.3 percent increase in ash content. Douglas-fir comprised 77 percent of the volume of the eight species sampled; 85 percent of the total volume was wood. Average values were 63 percent moisture content (dry basis), 0.39 specific gravity, and 8,500 Btu higher heating value. Ash content decreased and the percentage of pieces with heavy rot increased as piece size increased. Bark moisture contents showed large variations by season.

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