Treesearch

Southern Pine boltwood is in abundant supply, but it contains high proportions of juvenile wood, and hence utilization for structural purposes is difficult when conventional means of conversion are employed. As a different approach, it is proposed that heart-center cants be cut from coltwood and then sliced into thick veneers for assembly into beams. The veneers can be expected to exhibit a considerable range in stiffness. It is hypothesized that stiff veneers are stronger in tension and compression than less stiff veneers, and that this attribute can be used to advantage by locating the...

In a 30-year-old even-aged stand of loblolly pine on a site 90 loessial soil in southeast Arkansas during foul growing seasons, most trees on plots thinned to 125 square feet of basal area per acre increased in basal area continuously when, under the crown canopy, available water in the surface foot remained above 65 percent. Measurable diameter growth ceased when available water under crowns was less than 40 percent and daily potential evapotranspiration exceeded 0.24 inch of water. Trees on plots thinned to 55 square feet of basal area per acre grew continuously.

The higher members of the tribe Attini characteristically lay persistent and extensive odor trails especially in many neotropical areas. Thus, in Acromyrmex and Atta, long columns of foraging workers are frequently present on the odor trails but in the less specialized attine genera, workers may forage either in files or singly. Weber (1958) has indicated that the workers in monomorphic genera forage singly, a behavioral characteristic which he offers as evidence for the primitive position of these attine genera.

Reported here in detail is information obtained from two open-pollinated progeny tests of slash pine at the Ida Cason Callaway Foundation, Pine Mountain, Georgia. Because of the small amount of similar data available to tree improvement workers, it was decided to include as much information as possible, even though some of it is too limited for statistical analyses. These limited data are presented only as indications of possible trends, not as proof of definite relationships.

The portion of rainfall over forest cover which does not reach mineral soil can be separated into the parts evaporated from the canopy and from the litter. Canopy interception loss is usually estimated by subtracting the sum of throughfall (water falling through tree crowns) and stemflow (water running down stems) from rainfall measured in forest openings (Hamilton and Rowe 1949). Litter interception loss is defined here as the volume of water retained by the L and F layers of the forest floor and later evaporated without reaching mineral soil. Canopy interception has been investigated in...

The balsam woolly aphid, Chermes piceae Ratz. (Homoptera: Chermidae), was accidentally introduced into North America from Europe about 1900 (Balch 1952). The aphid is now a serious pest of Fraser fir, Abies fraseri (Pursh)Poir., in the Southern Appalachians. Since its discovery in Northo-1957 (Speers 1958), the aphid has killed thousands of trees annually. Fraser fir is an especially, valuable aesthetic resource along the Blue Ridge Parkway, in the Great Smoky Mougtains National Park, and Mt. Mitchell State Park where it is viewed by millions of persons annually.

Thick veneers cut from southern pine are relatively easy to dry, but they are not easy to dry free of distortion. The research reported here was undertaken to compare five drying systems. Factors evaluated included rate of water loss, degree of distortion, and the effect on strength. Effects on gluability were also briefly studied.

This report presents information on 1963 veneer log production and consumption in the Midsouth. The information is from a canvass of the industry made by the Southern Forest Experiment Station. Though an effort was made to locate all active plants, a few may have been overlooked. Omission of a firm, therefore, is no reflection upon its activities, nor does inclusion constitute a recommendation.

Pulpwood production in the south climbed to a fifth consecutive all-time high of 26,590,997 cords in 1963-60 percent of the nation's total. At year's end, the 81 southern pulpmills had a daily pulping capacity exceeding 54,000 tons. Nine additional mills from outside the region drew wood from the south in 1963.

This publication provides a "biassed history" of the Southern Forest Experiment Station through fiscal year 1933.