. Lumber recovery from ponderosa pine in northern California. Lumber; Ponderosa pine California, Northern. Results and Cubic recovery percent.—Cubic recovery percent was found to be independent of Discussion log grade for the four old-growth log grades; therefore, all the data for old growth Volume were pooled. A comparison of two sites and two log grades of young-growth logs again showed no statistical difference. A comparison of young-growth versus old- growth logs showed a statistical difference but not a practical difference; there- fore, the cubic recovery percent curves are based on the
. Lumber recovery from ponderosa pine in northern California. Lumber; Ponderosa pine California, Northern. Results and Cubic recovery percent.—Cubic recovery percent was found to be independent of Discussion log grade for the four old-growth log grades; therefore, all the data for old growth Volume were pooled. A comparison of two sites and two log grades of young-growth logs again showed no statistical difference. A comparison of young-growth versus old- growth logs showed a statistical difference but not a practical difference; there- fore, the cubic recovery percent curves are based on the pooled study data. As shown in figure 2, CR% increased sharply from 5 to 15 inches, then leveled off. The low recovery from the smaller diameter logs indicates that mills are relatively inefficient in converting these logs to lumber; therefore, a higher percentage of the log volume ended up as chips or hog fuel. Curves for CR% of surfaced dry lumber and of rough green lumber and sawdust are also shown in figure 2. The percentage of cubic volume of the log that was converted to chips can be found by subtracting the percentage of cubic recovery of rough green lumber and saw- dust from 100 percent. Percentage of cubic volume of the log converted to sur- faced dry lumber, shrinkage and planer loss, sawdust, and chips by scaling diameter are presented in table 2. Cumulative curves 90 -. 10 - 0 I 1 1 1 1 i I i I i I i i 0 10 20 30 40 50 60 Diameter (inches) Figure 2 —Relationship of cubic volume recovery to scaling diameter for all logs combined CR% increases as log size increases to 15 inches in diameter and then remains constant. The figure shows that the mill recovered a higher per- centage of lumber volume from larger logs. R2 MSE CR% of surfaced dry lumber = - (1/D) CR% of rough green lumber = - (1/D) CR% of rough green lumber and sawdust = - (1/D) 7. Please note that these images are extracted
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectlumber
