United States Department of Agriculture
Compares the 1978 National Fire-Danger Rating System and its 20 fuel models, along with other danger rating systems, with observed fire behavior and rates the strengths and weaknesses of models and systems.
The second inventory of the timber resource of Nebraska shows a 25% decline in commercial forest area and a 23% gain in growing-stock volume between 1955 and 1983. Text and statistics are presented on area, volume, growth, mortality, removals, utilization, biomass, and future timber supply.
The jack pine ecosystem has evolved through fire. Jack pine, although easily killed by fire, has developed serotinous cones that depend upon high heat to open and release the seeds. Without a fire to enable the cones to open, jack pine would be replaced by another species. Prescribed fire can be an economical management tool for site preparation in either a natural...
The fourth inventory of Wisconsin''s forest resources shows a 39-percent increase in growing-stock volume between 1968 and 1983, from 11.2 to 15.5 billion cubic feet.
In 1985 the forests of Illinois covered 4.3 million acres, an increase of 5.7 percent from the 4.0 million acres found in 1962.
Lake States pulpwood production fell from 7.19 million cords in 1984 to 6.84 million cords in 1985. Pulpwood production is shown by county and species group in Michigan, Minnesota, and Wisconsin
This study examined the effect of clustering timber harvest zones and of changing the land use categories of zones (dynamic zoning) over varying temporal and spatial scales. Focusing on the Hoosier National Forest (HNF) in Indiana, USA as a study area, I used a timber harvest allocation model to simulate four management alternatives. In the static zoning alternative,...
Reviews research evaluation techniques in a variety of fields an assesses the usefulness of various approaches or combinations of approaches for forestry research evaluation. Presents an evaluation framework that will help users develop an approach suitable for their specific problem.
The surface mineral soil beneath an aspen stand contained about 10 times as many bacteria (Corynebacteria, Mycobacteria, and Nocardia) and 30 to 50 percent more fungi (Trichoderma, Aspergillus, Cephalosporium, and Fusarium) than did soil beneath two conifer stands. These organisms were 10 to 1,000 times more abundant in the surface 10 cm than in the next 15 cm. Red...
Presents the resource manager with a key to the recommended practices for managing balsam fir stands, especially for timber. Discusses control of growth , establishment, composition, and damaging agents; also discusses managing for boughs and Christmas trees, wildlife habitat, esthetics, water. Includes information on estimating yield and growth.
Illinois'' 4,029,900 acres of timberland supported 4.8 billion cubic feet of growing stock in 1985. An increase of 40 percent since 1962. White oak is the most abundant tree species. Pope County in southern Illinois contains the most timber volume.
Reviews status of Neotropical migratory landbirds, and effects of land-use practices in the Midwestern United States, from a landscape perspective, through a series of papers authored by regional experts. Includes recommendations for the conservation of Midwestern Neotropical migratory landbirds.
This bulletin reports findings of a survey of all primary wood-using mills in Iowa in 1994.
The fifth forest inventory of Michigan's forest reports 36.4 million acres of land, of which 19.3 million acres are forested. This bulletin presents statistical highlights and contains detailed tables of forest area, as well as timber volume, growth, removals, mortality, and biomass.
The third measurement of Iowa?s forests was completed in 1990 by the North Central Forest Experiment Station and the Iowa Department of Natural Resources (Brand and Walkowiak 1991). The inventory found that black walnut trees are common in the forests of Iowa. Two out of every hundred trees in the State are black walnuts. To accomplish the inventory, more than 12,769...
Production of high-quality hardwoods is important in Ohio and black walnut ranks as one of the most valuable tree species in the State along with cherry, white and red oak, and ash. Ohio has more walnut growing stock volume than any other state, according to the most recently completed forest inventories in the East. The fourth and most recent measurement of Ohio?s...
Investigates the effects of site preparation on tamarack regeneration. Site preparation treatments used were broadcast burning, full-tree skidding and full-tree skidding with subsequent burning. Reports the effects of these site preparations on distribution and quality of seedbed types as well as density and initial growth of seedlings.
Documents the forces required to delimb hardwoods as a functional of knife parameters, and identifies opportunities to reduce forces and increase productivity of machines using delimbing knives.
An updated version of the Lake States variant of STEMS is evaluated and compared with the previous version. The new version is slightly more accurate and precise. The strengths and weaknesses of this tree growth projection system are also identified.
Fire has been a natural component of the aspen ecosystem. Any fire in an established aspen stand will cause injury. Aspen is easily top-killed, but the roots remain viable. A fire's heat can stimulate sprout growth from these roots, aiding natural regeneration.