Treesearch

Decay developing in decked western hemlock (Tsuga heterophylla) has caused considerable loss in pulp yields in the Pacific Northwest. The Oregon Pulp and Paper Co., which commonly decks hemlock logs through one summer and occasionally through two summers, cooperated with the Pacific Northwest Forest and Range Experiment Station in a study to determine (1) how much decay and pulp yield loss would develop during 1 and 2 years of storage and (2) whether the amount of such decay and loss could be decreased by continuous sprinkling with water during the dry summer months.

Sugar pine, the preferred species to grow on many forest areas in southwestern Oregon, is often seeded or planted on clearcuts there. Advance growth in the form of seedlings, saplings, and poles is common in the mixed- conifer type, and costly planting can be eliminated if this advance growth can be saved during logging and slash disposal. However, if the necessary changes in logging and slash disposal practices are to pay off, long-suppressed understory sugar pine seedlings and saplings must respond satisfactorily to release. A study on the South Umpqua drainage has shown that such sugar...

During 1955-56 an inventory was made of forested land in the Middle Fork Working Circle of the Malheur National Forest to provide information necessary for calculation of the allowable cut and for other management purposes. The growth and mortality estimates in the following report were obtained from this inventory. Although the estimates apply directly to the Middle Fork Working Circle, they may also be useful to foresters working in stands of similar types and condition classes in nearby areas.

The three volume tables in this report were developed to cover omissions and discrepancies in a previously published set of volume tables for permanent sample plots in western Washington.

As an ever-increasing number of young Douglas-fir stands in the Pacific Northwest come under intensive management, development of better tree-marking techniques based on sound scientific principles becomes essential. For this reason, two experiments have been established at the Wind River Experimental Forest near Carson, Wash., to measure the effect of different degrees of release on the growth rate of dominant, codominant, and intermediate trees. The initial test in a 41-year-old natural Douglas-fir stand has been previously reported. A second test in a nearby Douglas-fir plantation, 30...

Results from annual surveys of the destructive Phytophthora root disease of Port-Orford-cedar (Chamaecyparis lawsoniana (A. Murr.) Parl.) show that the disease is gradually spreading and intensifying within the natural range of Port-Orford-cedar. The disease became established on native trees in the early 1950's in the vicinity of Coos Bay, Oreg., and during its initial buildup invaded most of the low-lying area between Tenmile Lake and Port Orford. Since 1955 its progress, although less spectacular, has been characterized by gradual, steady encroachment into new areas.

This report presents the results of a study to determine the degrade—loss in volume and grade—of coast-type Douglas-fir lumber when kiln-dried and surfaced in accordance with commercial practice. The study measured (1) loss in volume due to culling and trimming of dry-surfaced lumber because of seasoning and surfacing defects, (2) reduction in grade due to seasoning and surfacing defects, and (3) reduction in grade due to incomplete manufacture or to the development of manufacturing defects. Degrade is expressed as a percentage of the green lumber volume and also as a loss in...

The growth characteristics of Sitka spruce seedlings and the influences of environment on seedling growth have been studied on the Cascade Head Experimental Forest in western Oregon since 1949. Knowledge of the growth characteristics of selected tree species and the limiting factors of the environment is essential to the planning of an effective reforestation program.

Severity of the 1959 fire season varied from well below normal in western Washington to a record-setting high in southwestern Oregon. The season was characterized by well-distributed, short rainy periods separated by comparatively short dry spells that frequently included days of high fire danger. July was the only month with markedly above-normal temperatures, and April and October were the only months with predominantly below-normal rainfall. Temperatures were substantially below normal in May and September, and considerably more than the normal amount of rain fell in September. Otherwise...

A series of screening tests were established during 1955 to determine the effects of six commercial and experimental herbicides on brush in southwestern Oregon. The herbicides were tested as foliage sprays on 13 of the most abundant species and varieties of brush on forest lands in this area. Low volatile esters of 2, 4-D and 2,4, 5-T proved to be the most effective herbicides.