Treesearch

Light commercial thinning in 100-year-old, well-stocked, mixed stands of western hemlock and Sitka spruce at Cascade Head Experimental Forest produced no consistent growth and yield responses related to thinning intensity. Mortality for all causes except windfall was generally less for thinned stands than for unthinned stands. Losses from windfall appear to be related more to location than to thinning.

New height growth and site index curves for red alder (Alnus rubra Bong.) were developed from stem analysis data. The analyses use a reference (site index) age of 20 years and are applicable to natural stands between 5 and 50 years of age in western Washington and northwestern Oregon. The new curves are polymorphic and provide a better fit to observed patterns of height growth than the previously available curves. Although differences from previously available curves are not large, the new curves should be an improvement, particularly for use in short-rotation management. Recommendations...

mountainous areas of the western United States, Canada, and Alaska is severely restricted by unstable terrain that is susceptible to soil movement varying from surface creep to catastrophic landslides. Management practices that might trigger or increase such disturbance are increasingly subject to public scrutiny. Land management-planning as required by the Resources Planning Act (RPA) (PL93-378 1, the National Forest Management Act (NFMA) (PL94-588), the Resource Conservation Act (RCA) (PL95-192) and other Federal and State laws requires that soil stability receive strong consideration in...

Program SOILS processes data from soil assessment surveys following a design adopted by the Pacific Northwest Region of the USDA Forest Service. It accepts measurements from line transects and associated soil subsamples and generates estimates of the percentages of the sampled area falling in each soil condition class. Total disturbance is calculated by combining certain detrimental soil condition classes. Variances and confidence intervals of the percentage of each class are computed. Summary or preliminary estimates may be inserted into the program for computing sample sizes to help in...

Provides current information on lumber and plywood production and prices; employment in the forest industries; international trade in logs, lumber, and plywood; volume and average prices of stumpage sold by public agencies; and other related items.

Observations of thinned ponderosa pine infested with dwarf mistletoe over a 17-year period suggests that on average or better Sites most infested stands can be managed to produce usable wood products in reasonable time, if trends found in juvenile stands continue.

The spotted owl (Strix occidentalis caurina) has been listed as a sensitive species by the Pacific Southwest Region USDA Forest Service. Past and present-studies-and surveys have led to the development of a region-wide network of owl territories to comply with the maintenance of viable populations as required by the National Forest Management Act. A brief explanation of the network is included.

Provides current information on lumber and plywood production and prices; employment in the forest industries; international trade in logs, lumber, and plywood; volume and average prices of stumpage sold by public agencies; and other related items.

Management practices and options to provide habitat for wildlife in the Great Basin of southeastern Oregon deal with both vegetation treatment and protection, livestock management, maintenance or distribution of water developments, protection of wildlife areas through road closures or fencing, and direct manipulation of wildlife through hunting, trapping, or other means. This chapter deals primarily with livestock management in relationship to wildlife and wildlife habitat. Included are discussions of ecological status (range condition), livestock management, multiple-use options for each...

Decreases in sage grouse followed the decrease in sagebrush. Other factors, such as unfavorable weather conditions at hatching time and increased predation, hunting, and disease have each been important at various times in localized areas but are probably not the most important factors in the overall downward trend.