Treesearch

The National Fire-Danger Rating System (NFDRS), implemented in 1972, has been revised and reissued as the 1978 NFDRS. This report describes the full developmental history of the NFDRS, including purpose, technical foundation, and structure. Includes an extensive bibliography and appendixes.

Outlines a procedure for fire management planning for parks; wilderness areas; and other wild, natural, or essentially undeveloped areas. Discusses background and philosophy of wilderness fire management, planning concepts, planning elements, and planning methods.

A mathematical expression was developed to estimate Engelmann spruce seed dispersal into clearcut openings. The pattern of seed dispersal is a rapid decline from within the windward stand to the stand edge and beyond into the opening. The amount of seedfall dispersed to the windward stand edge is about 80% of the seedfall under the uncut, windward stand. About 40% of the seedfall under the uncut stand is dispersed as far as 100 feet into the opening, and 10% as far as 300 feet. The initial rapid decline is followed by a gradual leveling-off, with about 1% of the amount of seed fall under...

Presents factors for converting current estimates of merchantable volume to weight, and models for predicting weights and volumes of tops and limbs, for important tree species in the Rocky Mountain States. Converts timber statistics from cubic foot volume to dry weight for tree components, such as bole, limbs, and top. Includes State-by-State data summaries.

Reports findings of the comprehensive inventory of Utah's 16 million acres of forest land, which include 3.2 million acres of commercial timberland. Presents area, volume, growth, mortality, and timber use; also describes timber types, volumes per acre, stocking, ownership, and major nontimber uses of the forest land.

This report gives an overview of the analytical methods used in in tegrated (multidisciplinary, multiresource, and multilevel) land management production analyses. The ecological and economic theory underlying both simulation and optimization methods are also reviewed.

Cattle grazing in pastures bisected by a small perennial stream in central Colorado had only minor effects on water quality during two years of study. Suspended solids and nitrate nitrogen did not increase significantly, and ammonia nitrogen increased significantly only once under moderate rates of grazing. Indicator bacteria densities in the stream water were significantly higher when at least 150 cattle were grazing. After removal of cattle or when 40 head of cattle were grazing, bacterial counts dropped to levels similar to those in an adjacent, ungrazed pasture. About 5 percent of the...

Wildland classification is a prerequisite to many tasks in the land management planning process. Although a variety of general wildland classification frameworks have been proposed for the United States, much work remains to develop detailed-level classification. This study was conducted in three parts to examine three related aspects of wildland classification at the detailed level. The first part of the study was designed to examine the utility of multivariate analysis techniques in developing an ecologic land classification for a specific area. The second part of the study was designed...

Bitterbrush and cliff rose are perhaps the most widely managed shrubs in Western North America. This proceedings of 27 papers is a collection of our current knowledge on research and management of bitterbrush, cliffrose, and other rosaceous shrubs in Western North America. Subjects include: (1) distribution, taxonomy, and habitat classification; (2) growth performance, phenology, and physiology; (3) successional relationships; (4) management strategies; (5) animal relationships; (6) soil-plant nutrient relationships; and (7) fire relationships.

Trees from growing stock levels of 20, 60, and 100 in sapling and pole stands were sampled at three vertical positions -zero, 25, and 50 percent of total height above the 1-foot stump. Wood grown during the 10-year period after initial thinning was compared for growth and wood properties. Wide differences in radial growth, induced by thinning treatments, were not accompanied by significant differences in specific gravity, latewood percentage, tracheid length, nor microfibril angle. However, all properties except microfibril angle were significantly affected by vertical position on the stem.