. Ponderosa pine lumber recovery : young growth in northern California. Ponderosa pine California, Northern. 100 90 - 80 - 70 - 60 50 - 40 - 0 30 1- t-H n D 20 O 10 U LUMBER RECOVERY PERCENT—GRADE 4 L0GS= + (log diameter) R2 = LUMBER RECOVERY PERCENT - GRADE 5 LOGS = + (log diameter) (log diameter2) R2 = 10 15 20 25 30 LOG DIAMETER (inches) Figure 5.—Percent of gross log volume produced as rough green lumber by log diameter—Grade 4 and 5 ponderosa pine. logs cut from these were Grade 4, the remainder were Grade 5 (fig. 6). Regressions of cubic re
. Ponderosa pine lumber recovery : young growth in northern California. Ponderosa pine California, Northern. 100 90 - 80 - 70 - 60 50 - 40 - 0 30 1- t-H n D 20 O 10 U LUMBER RECOVERY PERCENT—GRADE 4 L0GS= + (log diameter) R2 = LUMBER RECOVERY PERCENT - GRADE 5 LOGS = + (log diameter) (log diameter2) R2 = 10 15 20 25 30 LOG DIAMETER (inches) Figure 5.—Percent of gross log volume produced as rough green lumber by log diameter—Grade 4 and 5 ponderosa pine. logs cut from these were Grade 4, the remainder were Grade 5 (fig. 6). Regressions of cubic recovery percentage for rough green lumber and sawdust are presented in figure 7. The curves have been plotted in cumulative fashion in order to easily estimate volumes by tree diameter. For example, as read from figure 7, a 20-inch tree yielded the following estimated product amounts from the utilized portion that was delivered to the mill: percent sawdust, percent rough green lumber ( - ), and per- cent available for chips ( - ). Table 5 shows the distribution of lumber grade recovery percentages by tree diameter. The reader is reminded that the number of sample trees in the larger diameters is limited; therefore, the recovery values from prediction equations in this range should be viewed with caution for their accuracy. The variation in cubic recovery due to log and tree sizes is illus- trated by the rough green lumber curve in figure 7. Cubic recovery averaged 55 percent for all logs but ranged from 39 percent for 5-inch logs to 63 percent for 18-inch logs. These relationships should be of concern to any forest products industry in- stallation heavily involved in utilization of small timber. The cubic recovery percentage for all logs is shown in figure 5. 9. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
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