Treesearch

Presents weights, volumes, centers of gravity, and amount of residue for sugar maple trees and boles. Data may be useful to field foresters and equipment design engineers.

Within the crowns of red pine, Pinus resinosa Ait., trees, larvae of the cone insect, Dioryctria disclusa Heinrich, tended to follow the distributions of their foods. Between-tree distributions of larvae, however, were relatable to food distributions in only two of five years. Cone damage/tree by D. disclusa increased linearly with cone abundance per tree when insect populations were large relative to cones. Percentage cone damage/tree was not significantly correlated with cone abundance.

Describes a study of various thinning treatments in northern hardwood pole stands, using mechanized felling, skidding, and field chipping, as well as chain saw felling. Cost analyses showed that a profit can be made although it is less than can be made with clearcutting.

The third inventory of Missouri's timber resource shows a small gain in growing-stock volume and a somewhat larger gain in sawtimber volume since 1959. Area of commercial forest declined sharply between surveys. Presented are text and statistics on forest area and timber volume, growth, mortality, ownership, stocking, future timber supply, and forest management opportunities.

A new mathematical coordinate system results from a unique combination of two frameworks long used by ecologists: the phase plane and coaction cross-tabulation. The resulting construct combines the classifying power of the cross-tabulation and discriminating power of the phase plane. It may be used for analysis and synthesis.

Reviews five years progress of the Maximum Fiber Yield program. Twenty separate papers describe achievements and plans for this multiproject program.

Gives instructions for conducting an inventory of oak advance reproduction prior to final harvest cutting to evaluate the potential for successful oak reproduction in new stands. The potential for oak stump sprouting is also considered.

Mathematical functions were fitted to unpublished summaries of yield data collected and reported by L.F. Kellogg in 1940 for unmanaged black walnut plantations in the Central States. They cover a wide range of conditions and provide the best data base available for simulating growth and yield in plantations.

Presents 20 papers concerning recent research in forest genetics, physiology, and allied fields. Species discussed include cottonwood, white spruce, jack pine, white pine, aspen, and others. Emphasizes the role of tree improvement in increasing wood-fiber production. Includes abstracts from papers presented at the 15th Canadian Tree Improvement Association Meeting.

Secondarily treated sewage effluent, applied at the rate of 1 and 2 inches per week, infiltrated a frozen Sparta sand soil forested with jack pine and scrub oak. Maximum frost depth in treated plots averaged 60 cm and in check plots averages 35 cm. Nitrogen was mobile with some accumulation. Phosphorus was absorbed.