Treesearch

High quality water from our forest lands is subject to a rapidly increasing demand. Water from forested watersheds is suitable for many uses. One of the characteristics that determines water's usability, particularly for fish, is temperature.

Endrin applied to soil at rates of more than three times the maximum that might be expected from application of endrin-treated tree seed exerted no appreciable effect on numbers of soil microbes or on ammonification, nitrification, or sulfur oxidation. The decomposition of soil organic matter, as indicated by the production of CO2, was increased significantly in the presence of endrin. Results of our study agree substantially with other studies, indicating that a very high rate of endrin in soil would be necessary to alter microbial properties. We conclude that the relatively insignificant...

The relationship between estimated timber values and actual timber prices is discussed. Timber values are related to how, where, and when the timber is used. An analysis demonstrates the relative values of a typical Douglas-fir stand under assumptions about timber use.

Washington's 1970 timber harvest of 6.46 billion board feet was 7.8 percent below the near record harvest of 7 billion board feet established in 1969. Timber harvests on all public lands declined 13 percent with a 9.0-percent reduction in western Washington and a 22.9-percent drop in eastern Washington. State lands led the decline in public production with a 142-million-board-foot drop from 1969 (down 19.1 percent) followed by the National Forests with a 140.8-million-boardfoot drop (down 9.3 percent). Production on Indian lands declined 52.6 million board feet (down 12.5 percent) during...

The 1970 Oregon timber harvest of 7.98 billion board feet was the lowest recorded since the recession year of 1961 when 7.41 billion board feet of timber was produced. The 1970 log production figure was 12.8 percent below the 1969 harvest, the second consecutive year of declining production in Oregon.

A study conducted during 1969-70 in Oregon, Washington, and California indicates that the average net volume of logging residues ranged from 325 to 3,156 cubic feet per acre. The highest volume was on National Forests in the Douglas-fir region, which averaged 2.5 times greater than private lands. The lowest volumes of residue were found in the ponderosa pine region where both private and public lands averaged between 325 and 375 cubic feet per acre. Private lands in California averaged 1,558 cubic feet per acre, while National Forests averaged 1,206 cubic feet per acre. The total net...

A lodgepole pine levels-of-growing-stock study showed that trees growing at lower stand densities had longer crowns and grew more rapidly in diameter but did not grow significantly faster in height. Gross cubic-volume increment decreased with decreasing stand density. The decrease was small per unit of density at the higher densities but much greater at the lower densities. However, at the lower densities more wood is being added to the larger trees that can reach usable size. Soil moisture withdrawal was reduced at the lower stand densities. Understory vegetation did not develop strongly...

As the need for intensive management of timberlands becomes more evident, the effect of initial plantation spacing and/or early thinning on subsequent stand development is of increasing interest and importance to the land manager. Douglas-fir stands planted in 1925 at Wind River, near Carson, Wash., have been observed periodically for over 40 years and provide an increasingly valuable record of benefits derived from fairly wide, uniform spacing.

In the Pacific Northwest, as in many other parts of the country, burning is the standard method for disposal of undesirable waste including logging debris and agricultural residue. About 81,000 hectares (200,000 acres) of logging slash are burned annually west of the Cascade Range in the States of Washington and Oregon. In addition, 101,000 hectares (250,000 acres) of grasslands are burned in Oregon. Many other forms of residue are also disposed of by burning.

Soils derived from two widely distributed parent materials in central Washington were examined periodically during 1968-69 for physical and chemical properties. Basalt soils showed significant periodic variation in cation exchange capacity, pH, and Na and K contents. In sandstone soils, cation exchange capacity and Ca, Na, and K contents varied significantly among sampling dates. Although certain physical properties showed definite trends, none were statistically significant. These results indicate that, where sampling dates vary, periodic variation in certain chemical properties of these...