Treesearch

This is a progress report of a regional study on growing-space requirements for natural stands of loblolly pine (Pinus taeda L.).A primary objective is to measure the effects of residual stand density, obtained naturally or by cutting, during intermediate ages, upon volume yield and total production. By imposing real values and costs upon measured yields, net return may be calculated and used to determine optimum levels of stand density for various combinations of site, product, and financial goal.The attainment of this objective obviously depends on a series of measurements taken over a...

The man who is going to plant pine in the Sandhills will inevitablv ask himself, "When shall I plant? What species will I choose? How do I plant them? What are the chances for survival?" These have been some of the knotty questions asked by foresters and landowners for many years in the adverse Sandhill sites. Now, after 4 years of intensive regeneration research, we have some answers, many of them partial, but with helpful leads. Slost of our research has been with longleaf pine, the species most difficult to establish on dry, Sandhill areas. Successful planting methods developed for this...

Foresters concerned with measuring tree populations on definite areas have long employed two well-known methods of representative sampling. In list or enumerative sampling the entire tree population is tallied with a known proportion being randomly selected and measured for volume or other variables. In area sampling all trees on randomly located plots or strips comprising a known proportion of the total area are selected and measured for volume or other variables. List or enumerative sampling is commonly used in timber sales employing sample-tree measurement, and area sampling in timber...

The Calhoun Experimental Forest, a research area of the Southeastern Forest Experiment Station, was established in 1947 for work on Piedmont forest, soil, and water problems. Located in the Sumter National Forest, near Union, South Carolina, the forest was chosen because it represented poorest Piedmont conditions. Since early settler days, the great Piedmont belt of rolling clay hills has undergone drastic changes. Not infrequently, a foot of topsoil has been lost. The subsoil is typically a tight, impervious clay that sheds water rather than taking it in and storing it. Channels of...

Observations of checking frequency, depth of check penetration, veneer thickness, and surface quality were made at 20 machining conditions. An inverse relationship between depth of check and frequency of checking was established. The effect of cutting temperature was demonstrated, and strength in compression perpendicular to the grain, tension perpendicular to the grain, and rolling shear was determined at 4 temperatures. The mechanics of veneer formation is discussed with respect to the 2 basic veneer types observed.

Pulpwood production in southern states during 1957 fell slightly below the 1956 level, thus reversing a strong, long-term upward trend. Total production amounted to 19,782,600 cords, a decrease of 562,300 cords, or 2.8 percent, from the 1956 record high. At the same time, the combined pulping capacity of southern mills climbed from 38,000 tons per day in 1956 to 41,000 tons in 1957 as new mills and expanded productive equipment in existing mills went into operation.