Resin distribution in second-growth ponderosa pine

Abstract

In a study of specific gravity of second-growth ponderosa pine, there was visible evidence of resin in a part of the specific gravity specimens. Each specimen contained 10 annual growth rings in cross sections taken at 4 heights in the merchantable length of the trees. Since the presence of resin introduced an uncertain amount of error in the specific gravity values, it seemed advisable to extract the resin not only from the visibly resin-soaked specimens but also from all other specimens used. In this way, the general distribution of resin in the trees was found, and an approximate correction factor was obtained for the specific gravity values of the unextracted wood.

Citation

Paul, B.H. 1955. Resin distribution in second-growth ponderosa pine. Rep. FPL-2058. Madison, WI: U.S. Department of Agriculture, Forest Products Laboratory. 7 p.