Treesearch

A total of 562 white firs (Abies concolor (Gord. & Glend.) Lindl. ex Hildebr.) and red firs (A. magnifica A. Murr.) with logging wounds were felled, dissected, and analyzed for infection and decay in 28 commercially thinned stands on the Klamath and Tahoe National Forests in California. On the Klamath National Forest, decay losses associated with wounds were 1.2 and 5.7 percent of the gross merchantable cubic-foot volume and Scribner board-foot volume, respectively; on the Tahoe National Forest, these volumes were 1.7 and 7.6 percent. Wound area and age were most closely related to extent...

Sitka spruce (Picea sitchensis (Bong.) Carr.) grew an estimated 37 cubic feet of stemwood per acre per year (2.6 m3·ha-1·yr-1) in remnant World War II plantations on Amaknak Island and 38 cubic feet of stemwood per acre per year (2.7 m3·ha-1·yr-1) in an early 19th century grove on Expedition Island, 520 miles (837 km) southwest of natural tree limits in Alaska. Trees in fairly dense plots on Amaknak Island averaged 7 inches (18 cm) in diameter at breast height (d.b.h.) and 21 feet (6.5 m) tall on sheltered sites. The largest trees in the Expedition Island grove were 21.5 inches (54.6 cm)...

This paper instructs resource analysts on use of the Tree Value System (TREEVAL). TREEVAL is a microcomputer system of programs for calculating tree or stand values and volumes based on predicted product recovery. Designed for analyzing silvicultural decisions, the system can also be used for appraisals and for evaluating log bucking. The system calculates results based either on optimized tree bucking or on simulated bucking from user input. Currently, TREEVAL contains data for young-growth Douglasfir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii); however, other species can also...

Data on net primary biological productivity of United States forests are summarized by geographic region. Site factors influencing productivity are reviewed. This paper is a review of existing literature in the productivity of various forest regions of the United States, the influence of site factors on forest productivity, and the impact of various forest-management practices on site productivity.

The results of a statewide inventory of western juniper and pinyon-juniper woodlands are presented. Included are statistics on area of woodland by type and ownership; area of rangeland with scattered juniper and pinyon trees; wood volume by ownership, species, and tree size; juniper fenceposts; tree and stand age distribution; stand characteristics, including overstory and understory; and a discussion of resource potential and changes in western juniper and pinyon-juniper woodland since 1945.

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.

A bark-scoring trial was carried out on 379 of 1,234 grafts in five western Oregon seed orchards. Ages of grafted trees in 1983 ranged from 5 to 16 years. Scoring was done in April, June, or August of the first and third years of the 4-year test. Cuts across the defective interface of the union were made every 3.1 to 4.3 cm with a small, gas-powered chain saw. Many trees showed improved vegetative vigor after treatment. Annual mortality in the five orchards averaged just 1.6 percent when all defective grafts were treated. Diameter growth of rootstocks was least in incompatible grafts and...

Mountain goats in southeastern Alaska occupy habitats providing abundant areas of highquality forage during summer but only limited feeding areas during winter because of deep snow. Winter is a period of severe utritional deprivation, and goats converge into areas with available forage, often within old-growth forest where relatively low snow depths and litterfall enhance food availability. Goats are further restricted in their habitat use to sites within and near steep and rugged terrain, which provides escape areas from predation by wolves. Because goat winter habitat is limited, even...

TREEVAL is a microcomputer model that calculates tree or stand values and volumes based on product prices, manufacturing costs, and predicted product recovery. It was designed as an aid in evaluating management regimes. TREEVAL calculates values in either of two ways, one based on optimized tree bucking using dynamic programming and one simulating the results of user-specified bucking.

The USDA Forest Service national range program is currently evaluating its information needs at the national level A Range Measurement Task Group of Agency personnel was assembled in January 1988 to evaluate the information needs and recommend appropriate measures and reports. This document is the final recommendation of the task group. The recommendation includes measuring and reporting five broad areas of range management: range vegetation management, riparian vegetation management, grazing management, noxious weed management, and wild horse and burro management. Each area is directly...