Treesearch

Increased research and development of cultural practices and species has assured success of establishment of trees and shrubs on lands disturbed by surface mining. Trickle irrigation and water harvesting techniques have increased survival of planted stock by 250 percent for some species.

Trickle irrigation, during establishment, increased survival two fold for seven species of shrubs and trees planted on coal mine spoil in the semiarid area of northeastern Wyoming, USA. Increased survival of irrigated plants persisted for five years after initiation of this study, which included two growing and winter seasons after cessation of irrigation. Species included green ash (Fraxinus pennsylvanica), Russian olive (Elaeagnus angustifolia), silver buffaloberry (Shepherdia argentea), Siberian peashrub (Caragana arborescens), American plum (Prunus Americana), ponderosa pine (Pinus...

This manual documents the fuel modeling procedures of BEHAVE--a state-of-the-art wildland fire behavior prediction system. Described are procedures for collecting fuel data, using the data with the program, and testing and adjusting the fuel model.

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...