Treesearch

Norway or red pine (Pinus resinosa Ait.) has been popular in Maine for forest planting because it will rapidly convert grass and weed cover to a forest floor and because it is relatively free from attack by insects and diseases. Since the first commercial thinnings consist of small-sized trees, the most logical market outlet is for pulpwood. Yield of pulp fiber by weight is directly correlated with the specific gravity of the wood. Consequently, several questions arise: What is the average specific gravity of plantation red pine of a given age? Can the tree specific gravity for young,...

A number of problems related to the culture of Scotch pine (Pinus sylvestris L.) arose following the increased planting of this species in Iowa. Therefore, a program of controlled-environment experiments to determine the effects of genetic and environmental factors on physiological processes important to the culture of Scotch pine was begun by the Iowa Agricultural Experiment Station. We will report here the results of some of these experiments, done by ourselves and students of the junior author. Some of these results have been published elsewhere, and some have not.

The use of bigtooth aspen (Populus grandidentata Michx.), quaking aspen (P. tremuloides Michx.), and cottonwood (P. deltoides Bartr.) by the pulp and paper industry has increased greatly during the past decade. This expanded use has stimulated research on the genetic improvement of Populus. For the past 12 years an industry-sponsored aspen program has been underway at The Institute of Paper Chemistry (Einspahr and Renson 1964). One of its major goals has been the improvement of wood properties important to pulp and paper quality. During these 12 years a number of selected trees were...

Jack pine (Pinus banksiana Lamb.) is widely used in Lake States reforestation because of its ability to make rapid early growth on relatively infertile sites. It is a major pulpwood producing species. Since the quality and yield of pulp are so strongly influenced by tracheid length and specific gravity, information on genetic variation in these characteristics would be useful in planning future jack pine tree improvement programs. This study was done to: 1) measure tracheid length and specific gravity variation by seed source in the juvenile wood of jack pine; and 2) develop a basis for...

Veneer-log production in 1966 was about 51 million board feet in the Lake States and 37 million in the Central States. The Lake States hard maple harvest exceeded 13 million board feet, up 1.3 million from 1965. The walnut harvest in the Central States was nearly 15 million board feet.

The report presents statistics on area, volume, growth, mortality, and timber use. Projections of expected timber volumes 30 years in the future are also presented. These data are discussed with regard to possible future development and use of the state's woodlands.

Banks are stabilized to protect adjacent high-value items such as cabins and campgrounds, or to reduce reservoir or lake sedimentation rates. Also, bank stabilization is undertaken as one part of fish habitat improvement programs. Rock rip-rap is the best material for bank stabilization in most cases. It does not deteriorate with time and it blends in well with the surroundings. The upper part of the bank will revegetate naturally. However, sloping and seeding will accelerate revegetation.

Equations are presented for estimating shrinkage and resulting footage losses due to drying hard maple lumber. The equations, based on board shrinkage data taken from a representative lumber sample, are chiefly intended for use with lots of hard maple lumber, such as carloads, truckloads, or kiln loads, but also can be used for estimating the average shrinkage of individual boards.

Site quality for white and black oak in southern Indiana may be affected by such things as depth of surface soil; distance from ridgetop; slope steepness; and stone, silt, and clay content.

Reviews information on paper birch resources, silvics, wood quality, properties, and uses; makes recommendations for further research; includes 49 literature citations.