. Lumber recovery from ponderosa pine in northern California. Lumber; Ponderosa pine California, Northern. Value Average value (dollars per thousand lumber tally—$/MLT) was predicted for each log grade. The regression equations for the grades were compared and no statis- tical difference was found between grade 1 and grade 2. These results agree with previous results of the volume recovery and percent volume by grade recovery for these two log grades. Grade 1 and 2 logs were again combined to form a single regression line for estimating $/MLT. The grading system separates the value for grade 3
. Lumber recovery from ponderosa pine in northern California. Lumber; Ponderosa pine California, Northern. Value Average value (dollars per thousand lumber tally—$/MLT) was predicted for each log grade. The regression equations for the grades were compared and no statis- tical difference was found between grade 1 and grade 2. These results agree with previous results of the volume recovery and percent volume by grade recovery for these two log grades. Grade 1 and 2 logs were again combined to form a single regression line for estimating $/MLT. The grading system separates the value for grade 3 and grade 5 logs (fig. 6). Young-growth logs from 5 to 15 inches in diam- eter have the same average lumber value as grade 5 logs of the same size. Young- growth logs larger than 15 inches have higher lumber values than the grade 5 logs, probably because most 15- to 22-inch young-growth logs are butt logs whereas the corresponding old-growth grade 5 logs are upper crown logs with many more larger knots. 700 600 500 - |— 400 - -I </} 300 200 100 „ Grade 5. Grades 1 and 2 Grade 3 0 10 20 30 40 Diameter (inches) Figure 6.—The log grading system (Gaines 1962) for ponderosa pine effec- tively separates logs by their value. Although there is no difference between grade 1 and grade 2 logs, grade 3 and grade 5 logs are proportionally lower in value. The young-growth logs have a higher value than grade 5 logs larger than 15 inches because most young-growth logs of that size are butt logs. 50 60 MSE Grades 1 and 2: $/MLT = + (D) - (1/D) Grade 3: $/MLT = + (D) - (1/D) Grade 5: $/MLT = + (D) + (1/D) Young growth: $/MLT = + (D) 7112 4670 2902 2168 13. 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 not perfectly resemble the original Ernst, Susan. cn; Pon
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectlumber
