Raw material characterization and properties of structural flakeboard from coppice grown hybrid poplar

Abstract

wood yield was 330 pounds per acre at the 0.75 ft spacing, 106 pounds 2 2 at the 1 ft spacing, 31 pounds at the 2 ft spacing, 8 pounds at the 4 2 2 2 ft spacing, 2 pounds at the 8 ft spacing, and 1 pound at the 12.7 ft spacing. Mean annual increment for total dry wood weight yield per acre reached a maximum at 10 years age for the three narrowest spacings and 15 for the three largest spacings. Ek et al. (1983) demonstrated similar trends for coppice yields from several clones at three spacings. Some Characteristics of Populus Since Populus has been the principal species under investigation in the SRIC program, a considerable amount of literature now exists for certain growth and quality characteristics. Some growth and yield data have been reported for both the original planted stand and subsequent coppice growth. The majority of the available quality data refers to the frequently measured parameters of specific gravity and fiber length. Unfortunately, the literature is quite sparse in reference to quality measurements made on coppice grown material. Populus is a diffuse porous hardwood exhibiting above average growth rate and is of average quality. These characteristics, plus the fact that Populus coppices easily, has moderate disease resistance, has a wide genetic base suitable for selection, and is easily hybridized, all were considered in its selection for extensive testing in the SRIC program (Dickman, 1975). 13 Height and diameter Average height and diameter growth of numerous clones at various high planting densities is noteworthy. Dawson et al. (1976) reported height growth for Populus "Tristis #1" at the end of the second growing season of 5.8 feet at a 9 x 9 inch spacing; 5.86 feet at a 12 x 12 inch spacing; and 6.17 feet at a 24 x 24 inch spacing. After the third growing season, these heights were 10.10 feet, 11.10 feet, and 12.55 feet, respectively. Basal diameter of these same trees increased from 0.60 inch to 0.84 inch for the 9x9 inch spacing; 0.69 inch to 0.93 inch for the 12 x 12 inch spacing; and 0.91 to 1.32 inch for the 24 x 24 inch spacing, from the end of the second to the end of the third growing seasons. Bowersox and Ward (1976) measured height and diameter (at 15 cm) for poplar clones NE-49 and NE-388 for four years at growing 2 spacings approximating 0.09, 0.19, 0.28, 0.37, and 0.46 m. Differences in height and diameter growth among clones and spacings were not evident until after the second growing season. After four growing seasons, average height growth was 3.93 m for the smallest spacing, and 4.42, 5.03, and 5.00 m for increasing spacing levels, respectively. Diameter measurements at age four followed similar trends as height growth with 2 spacing. Diameter was 2.26 cm at the 0.09 m spacing and increased with 2 increasing spacing to 3.81 cm at the 0.46 m spacing. Height and diameter growth at various ages after coppicing have been reported. Ek et al. (1983) made measurements on seven poplar clones at the end of each year for three years following coppicing. Included were clones NC-53...

Stem, branch, and root wood anatomy of black oak (Quercus velutina Lam)

“…The variance components indicate that it would be advantageous, in future studies, to sample more trees with fewer subsamples per tree (Mize and Winistorfer, 1982;Winistorfer, 1985).…”