Treesearch

The fourth inventory of the timber resources of the Olympic Peninsula shows a total of 3,105,000 acres of commercial forest land and 81,464 million board feet (International 114-inch scale) of sawtimber volume. Total timber volume has remained about the same for the past 12 years, and cut and growth currently are nearly in balance.

Four charts are presented that show sampling rate and number in sample for different desired levels of accuracy when number in population and coefficient of variation can be estimated.

Genetic load has been estimated for a number of outcrossing organisms, for example, Drosophila (Malogolowkin-Cohen et al. 1964), Tribolium (Levene et al. 1965), and man (Morton, Crow, and Muller 1956). However, little informaiton about load of deleterious genes in higher plants has been published. The purpose of this article is to provide some data on plants by reporting an estimate of embryonic load in coastal Douglas-fir as determined from comparison of set of sound seed following self-pollination and following controlled crossing with unrelated pollen.It was stated a decade ago (Dobzhans...

Developments in techniques, methods, and equipment for producing oleoresin from the living pine are discussed. Particular emphasis is given to the need for mechanized production methods if this ancient industry is to survive the competition from other sources of rosin and turpentine.

Greenhouse-grown Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) graft unions were examined between 2 and 84 days after grafting. Room temperature was maintained at 60-70 F throughout the growing season. In most respects grafts of Douglas-fir followed development patterns previously reported for spruce and pine grafts, but specific differences were noted in contributing cell types, time of formation, and mode of healing. The time interval from first occurrence to occurrence in 80% of the grafts is as follows: contact layers, 2 days; callus bridges, 10-14 days; periderm, 10-17 days;...

A simple device for indicating maximum windspeed during a time interval is described. Use of a unijunction transistor, for voltage sensing, results in a stable comparison circuit and also reduces overall component requirements. Measurement is presented digitally in 1-mile-per-hour increments over the range of 0-51 m.p.h.

Washington's 1968 timber harvest of 6.97 billion board feet was the largest since 1929 when a record 7.38 billion board feet was produced. Private harvests increased 16.5 percent in western Washington and 15.7 percent in eastern Washington for an average increase of 16.5 percent, 45.5 million board feet above the private harvest in 1967. Forest industries in Washington increased their log production by 538.3 million board feet (20.9 percent) and other private owners increased their production by 7.2 million board feet (1.0 percent).

Oregon's 1968 timber harvest of 9.74 billion board feet was the largest since 1952, when a record 9.80 billion board feet was produced. Public agencies' harvests increased 25.0 percent in western Oregon and 4.1 percent in eastern Oregon for a total increase of 19.1 percent, 864.9 million board feet above the public harvest in 1967. National Forests had the largest production increase of 460.8 million board feet (up 14.5. percent), followed by the Bureau of Land Management's increase of 378.0 million board feet (up 34.6 percent) and by the state's increase in production of 34 million board...

During the first 4 years following application, addition of 200 to 600 pounds of nitrogen per acre increased height increment 62 percent and d.b.h. increment 79 to 160 percent. Gross basal area increment was greater with heavier fertilizer applications, but severe snowbreakage wa also increased. Thus, net production tended to be greatest with the addition of 200 pounds of nitrogen. Indications are that heavier application rates will have a longer lasting beneficial effect.

Decomposition of thinning slash deposited on the soil surface should have no direct adverse effect on the soil nitrogen available to higher plants in the pumice soil region. Decomposition of roots of cut trees would immobilize nitrogen in the soil immediately adjacent to the root during the decomposition period, which appears to be short for the smaller roots. However, these dead roots no longer compete for soil nitrogen in unexploited soil zones. Thus, nitrogen available for individual trees may be increased by thinning. If chipped slash is mechanically incorporated into the soil, a...