Treesearch

Shows how it is possible to obtain governing equation parameter estimates on the basis of observed system states. The approach used represents a constructive alternative to regression techniques for models expressed as differential equations. This approach allows scientists to more completely quantify knowledge of forest development processes, to express theories in terms of one or more governing differential equations, and to determine unknown numerical constants in the governing equations.

Describes the components, assembly, and performance of a high-capacity water pumping and distributing system developed for control of intensely burning experimental fires in northeastern forests.

A study of epicormic sprouting in pole-size sugar maples showed that all visible dormant buds on the bole were capable of producing epicormic shoots. The buds were induced to break dormancy by applying four methods of crown removal known to stimulate sprouting. The amount of crown removed determined the year that the buds broke dormancy; this may be accounted for by the location of growth regulators at the time of treatment. Few buds broke dormancy on untreated trees, indicating that the crown exerts a major influence on the formation of epicormic shoots.

Provides data on the variation in density and the proportion of sugar maple sapwood and heartwood by height in the tree.

This paper discusses the results of field tests to determine experimentally the weights and locate the centers of gravity for aspen trees and boles.

To determine whether overestimated cull could partly explain differences between bid offers and appraised values of northern hardwood timber, cull volume estimated by the accepted method was compared with actual cull volume measured from flitch photographs and log-scaled cull volume.

Seeds of yellow and paper birch were stored successfully in closed containers at 36 degrees to 49 degrees F. for 8 years, but viability varied greatly among individual lots.

Sycamore specimens were planned with various combinations of depths of cut and rake angles. Depths of cut up to 1/16 inch had no significant effect on the occurrence of chipped grain in sycamore but rake angle did.

A test of the influence of light intensity on dormant buds of young sugar maple trees showed that exposure to light is not essential for epicormic sprouting

Picloram (4 amino-3, 5, 6-tri-chloropicolinic acid), manufactured under the name of Tordon, controls most pole-size and smaller hardwoods in the Lake States by stem injections spaced up to 6 incest apart.