"Black Bark" Ponderosa Pine: Tree Grade Definition and Value Comparison with Old-Growth Trees
Author: Willits, Susan1
Source: Western Journal of Applied Forestry, Volume 9, Number 1, 1 January 1994 , pp. 8-13(6)
Publisher: Society of American Foresters
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Abstract:
A ponderosa pine (Pinus ponderosa) tree grade has been developed to separate lower value, small-diameter trees typical of young-growth stands from small-diameter old-growth trees. The tree grade uses a combination of bark, limb, and crown characteristics to identify the "black bark," trees. The tree grade was tested in two shop type mills and one dimension mill in southern Oregon and eastern Washington. Significant differences in value were found between the sample of black bark pine and the grade 5 control sample. Differences in value increased with diameter because of increased opportunities to recover high-quality lumber from the larger old-growth trees. The dimension mill recovered more lumber volume from the smaller diameter logs because of fewer sawlines and smaller rough-green sizes. Even though the shop mills recovered lower volumes, they did recover higher value by producing Shop and Common grade lumber rather than standard Dimension grades. Overall the differences compensated for each other, and both mill types recovered roughly equal value from logs of similar grade and size. West. J. Appl. For. 9(1): 8-13.Document Type: Journal article
Affiliations: 1: USDA Forest Service, Pacific Northwest Research Station, P.O. Box 3890, Portland, OR 97208
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