Mechanical grading of lumber sawn from small-diameter lodgepole pine, ponderosa pine, and grand fir trees from Northern Idaho

摘要: Forest lands of the Inland Northwest have many timber stands consisting overgrown, densely stocked trees that create a fire hazard and are prone to disease. These need be thinned, but cost harvesting often exceeds value ofthe produced. However, because dense stocking resulting slow growth these may produce lumber with desirable mechanical properties. One method for sawmills more fully utilize potential grade yield realize greater economic return from such machine-stress-rated (MSR) instead visually graded dimension lumber. The purpose this study was determine properties, corresponding value, lodgepole pine, grand fir, ponderosa pine produced typical overstocked forest in northern Idaho. tested modulus elasticity rupture, each piece sorted into two types categories: 1) visual Structural Light Framing; 2) MSR. This indicated three species we had good characteristics. MSR grading group $27/MBF increase above grading, fir $15/MBF grading. samples were poor quality thinned below. Because higher grades, thinnings judged not candidate production points out sawn timber, demonstrates an assessment process estimate local resource capability.