Surfing the Koehler Curve: revisiting a method for the identification of longleaf pine stumps and logs
Measurements of pith and second growth ring diameters were used by Koehler in 1932 to separate longleaf pine (Pinus palustris Mill.) timbers from those of several southern pines (e.g., loblolly, shortleaf). In the current study, measurements were taken from plantation-grown longleaf, loblolly and shortleaf pine trees, as well as old growth longleaf pine, lightwood, and turpentine stumps, to evaluate the method. Results presented here demonstrate that the Koehler method provides an effective means to identify longleaf pine timbers and stumps with applications in the conservation and forest products fields.