Effect of Cultural Treatment and Wood-type On Some Physical Properties of Longleaf and Slash Pine Wood
Keywords:Longleaf pine, slash pine, fertilization, thinning, moisture content, shrinkage, latewood percentage, rings per inch, specific gravity, tree height, wood-type
AbstractWood was studied from relatively mature longleaf and slash pine trees that had been growing under experimental treatments including cultivation, two levels of thinning, and four levels of fertilization in various combinations. From discs taken at five heights and separated into three wood-types, green moisture content, radial shrinkage, tangential shrinkage, volumetric shrinkage, latewood percentage, number of rings per inch, and specific gravity were determined. In longleaf pine, there were indications of treatment effect on latewood percentage and the number of rings per inch, with the more intensive treatments generally leading to fewer rings and higher amounts of latewood. In slash pine, a similar trend was found with these two variables. The species exhibited an almost identical trend in the interrelationships among properties. Green moisture content was negatively correlated with specific gravity and moisture content of the innerwood and middlewood increased with height. Shrinkage was found to be negatively correlated with height and positively correlated with specific gravity, except in the innerwood. Latewood percentage accounted for much of the variation in specific gravity in all wood-types. In the outerwood only, there was a positive but weak correlation of number of rings with specific gravity.
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