. Deterioration of sugar maple following logging damage. Trees Wounds and injuries; Wood-decaying fungi; Sugar maple. Figure 8.—Upper Photo: Fan- shaped discolorations be- neath small, callused-over scars extend only toward the heartwood. These dark, brown stains are arrested from progressing outward into the bright callus wood, This is the usual pattern of this defect except in scars infected by sapwood- rotting fungi. Lower Photo: Small logging scars that have completely healed. Decay is not pres- ent and stain is not impor- tant since discoloration extended only 11 inches longitudinally as
. Deterioration of sugar maple following logging damage. Trees Wounds and injuries; Wood-decaying fungi; Sugar maple. Figure 8.—Upper Photo: Fan- shaped discolorations be- neath small, callused-over scars extend only toward the heartwood. These dark, brown stains are arrested from progressing outward into the bright callus wood, This is the usual pattern of this defect except in scars infected by sapwood- rotting fungi. Lower Photo: Small logging scars that have completely healed. Decay is not pres- ent and stain is not impor- tant since discoloration extended only 11 inches longitudinally as measured after sawn into lumber. Eleven percent of the gross volume of 5,910 board-feet (Scribner log rule) was de- graded when the logs were examined to determine the effects of 10-year-old log- ging scars on sawlog quality. In this 136-log sample 12 logs (9 percent) were reduced in quality class. Five sawlogs (350 board-feet) were degraded from No. 1 to No. 2 grade, resulting in a loss of $ Six logs (240 board-feet) were lowered from No. 2 to No. 3 grade, a value loss of $ One severely scarred log containing 80 board-feet was reduced from No. 1 to No. 3 grade and lost $ in value. A total loss of $ for the entire sample was computed. This represents an average loss of $ per thousand board-feet of sawlogs. Ten percent of the gross volume of 5,460 board-feet (Scribner log rule) was degraded when scaled to determine the effect of 20-year-old logging scars on sawlog quality. In the 116-log sample 10 sawlogs ( percent) were degraded. Four logs (290 board-feet) were reduced $ in value when they were degraded from No. 1 to No. 2 grade. Six logs (260 board-feet) were reduced from No. 2 to No. 3 grade, a loss of $ The average loss per thousand board-feet was $,i2r 19/ The lower average loss in value for logs with 20-year-old scars versus that for logs with 10-year-old scars is exceptional. See discussion on page 27. 20. Please note that these
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Keywords: ., bookcentury1900, booksubjecttreesw, booksubjectwooddecayingfungi
