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Full-Text Articles in Forest Sciences
Tb141: Nitrogen Fertilization Effects On Growth And Value Of Eastern White Pine Sawlog Stands On Till And Outwash Soils, Robert K. Shepard, Gregory A. Reams
Tb141: Nitrogen Fertilization Effects On Growth And Value Of Eastern White Pine Sawlog Stands On Till And Outwash Soils, Robert K. Shepard, Gregory A. Reams
Technical Bulletins
Diameter growth response functions were developed using data collected from nitrogen fertilization study plots in eastern white pine stands on till and outwash soils. These functions were combined with height measurements and used to evaluate stand volume and value growth. White pine diameter growth functions were developed for application rates of 0, 50, 100, and 200 lb of nitrogen/ac, but only those for the 0 and 100 lb/ac treatments were compared because it was evident that the 100 lb/ac treatment would provide a larger financial return than either 50 or 200 lb/ac. The mean increase in sawtimber volume due to …
Tb139: Stand Age And Density Effects On Volume And Specific Gravity Of Black Spruce, Robert K. Shepard, James E. Shottafer, William C. Bragg
Tb139: Stand Age And Density Effects On Volume And Specific Gravity Of Black Spruce, Robert K. Shepard, James E. Shottafer, William C. Bragg
Technical Bulletins
Ten dominant or codominant trees were sampled from a 29-year-old black spruce stand, released at age 19, and ten of comparable dbh from a 77-year-old, unthinned stand. A variety of characteristics, including taper, volume, and specific gravity of the bole, as well as the change in specific gravity with age at breast height, were determined for trees from both stands. The older trees had significantly less taper, shorter crowns, approximately 1.9 times more merchantable volume and 10% higher specific gravity. The juvenile period for specific gravity was approximately 60 years. The higher specific gravity and merchantable volume of the older …
Tb127: Age And Thinning Effects On Wood Properties Of Red Spruce (Picea Rubens Sarg.), Michael P. Wolcott, Robert K. Shepard, James E. Shottafer
Tb127: Age And Thinning Effects On Wood Properties Of Red Spruce (Picea Rubens Sarg.), Michael P. Wolcott, Robert K. Shepard, James E. Shottafer
Technical Bulletins
Ten overstory red spruce were selected from a thinned stand and 1 0 from an unthinned stand. Average age of sample trees was approximately 80 years. Specific gravity reached a maximum at age 53 in the thinned stand and age 72 in the unthinned stand, after which it remained relatively constant. Stiffness reached a maximum at ages 35 and 50, and bending strength at ages 41 and 54; both remained relatively constant with further increases in age. Stiffness showed the largest relative difference between juvenile and mature wood, 22%, and specific gravity the smallest difference, 8%. Thinning did not adversely …