Treesearch

Statistics on forest area, total gross and net timber volumes, and annual net growth and mortality are presented from the 1972 timber inventory of the Petersburg/Wrangell unit, Alaska. Timberland area is estimated at 1.3 million acres (520 770 ha), net growing stock volume at 7.1 billion cubic feet (200.2 million m3), and annual net growth and mortality at -40.0 and 69.2 million cubic feet (-1.1 and 1.9 million m3), respectively.

Timber resource statistics from a 1973-76 inventory are presented for private timberland in western Oregon. Inventories usually classify private owners as either forest industry or nonindustrial private. For this report, however, the nonindustrial private classification has been further disaggregated into farmer, individual, and corporate owners. For all private owner classes, the statistics are presented by size of the holding.

A total of 363 western hemlock (Tsuga heterophylla (Raf.) Sarg.) logs from Alaska were sawn to compare recovery at a stud mill and at a dimension mill. Recovery at both mills varied by log diameters and by log scaling system. Lumber grade recovery was primarily in Stud grade at the stud mill and in Standard and Construction grade at the dimension mill. Lumber volume recovery is based on long log Scribner scale and on cubic scale. Lumber recovery was 2.23 times the Scribner volume at the stud mill and 2.05 times the Scribner volume at the dimension mill. The lumber recovery factor was 9.0...

A boom-type tree shaker was used in a Douglas-fir seed orchard to remove cones from 7- to 9-meter tall grafted Douglas-fir trees. An average of 55 percent of the cones were removed by shaking, while damage inflicted to the upper crown was confined primarily to branch and leader breakage in the top three internodes. Damage to the lower bole, where the shaker head attached to the tree, occurred only once. Shaking a significantly greater proportion of cones from 7- to 9-m tall Douglas-fir trees without drastically increasing top damage is not likely. Much of the cone crop on small trees is...

At least 99 species, representing 14 families of Trichoptera, are recorded from the H.J. Andrews Experimental Forest, near Blue River, Oregon. The collecting sites include a wide diversity of environmental conditions in a 6000-hectare watershed of the western Cascade Range (from 400 to 1 630 meters in altitude and from 1st- to 7th-order streams).

Environmental factors were related to forest regeneration on clearcut and partially cut areas managed by the Bureau of Land Management in the Hungry-Pickett area northwest of Grants Pass, Oregon. The multiple regression equations developed for this study can be used to compare the relative difficulty of regenerating forested sites within the study area. The equations show that difficulty of regenerating clearcuttings increases with increasing solar radiation, temperature, rock cover, and depth of the soil A horizon. Difficulty of regenerating partial cuts increases with surface gravel...

The 15-year growth response from a levels-of-growing-stock study in an even-aged western larch (Larix occidentalis Nutt.) stand in northeastern Oregon, first thinned at age 33, showed that trees growing at lower stand densities grew more rapidly in diameter but did not grow faster in height than trees in high density plots. Both basal area and total cubic volume increment increased as stand density increased. Despite the large reduction in volume increment at the lower densities, however, most of the wood is concentrated on fewer, faster growing trees that can reach usable size sooner.

This report summarizes a 1977 inventory of timber resources in 17 Oregon counties east of the crest of the Cascade Range. Detailed data on forest area, timber volume, growth, mortality, and harvest are presented.

Agricultural yield strategy simply aims to increase number of grain bearing stalks per acre. Forestry strategies look to thinning, fertilizer, and genetics, each to provide gains. The agricultural strategies applied to Douglas-fir appear to be impractical for long rotations. Concern is expressed for commitments to perpetual inputs of materials and energy to keep a yield above the land’s carrying capacity. Adapted natural populations are the major resource in keeping a yield improvement strategy trouble-free.

Distribution of anadromous salmonids and coniferous forest coincides along much of the Pacific slope; consequently, the habitat of anadromous' fish is subject to a wide variety of silvicultural treatments required to establish and nurture young forests. Silvicultural treatments discussed in this report include cutting prescriptions, broadcast burning, mechanical site preparation, planting, and competition reduction. Timber harvest, and use of pesticides and fertilizers are discussed in other papers in this series. Broadcast burning and machine scarification and piling can increase sedimenta...