United States Department of Agriculture
Documents the biomass in 12 typical stands of puckerbrush and evaluates the feasibility of several potential systems to harvest these stands. Identifies areas of needed development for economically viable harvesting systems.
The second forest resource inventory of Nebraska showed a 25% decline in commercial forest area and 23% gain in growing-stock volume between 1955 and 1983.
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 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.
Hundred-seed weights from 15 trees in each stand averaged 330 mg; 100-seed weights differed significantly among trees within stands and among stands. Germination of filled seed averaged 95 percent; germination differed significantly among trees within stands, but not among stands. Detailed seed records should be kept for all seed orchards.
Research evaluation is a relatively recent endeavor in forestry economics. This workshop represents most of the current and recently completed studies available in this subfield of forestry and evaluation. Also included are discussions of scientists and policymakers concerning the uses of forestry research evaluations, evaluation problems encountered, solutions...
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.
Summarizes a series of studies that investigated chemical weed control from time of planting to the end of the second growing season. The studies confirm the importance of weed control with preemergents at the time of planting and the importance of additional weed control before the start of the second growing season.
Plants are indicators of environmental factors like moisture, nutrients, heat, and light. Semi-quantitative indices for these four factors were developed for 90 Michigan trees and shrubs. The indices and a tally of species present provide a simple evaluation of the environment of a forest stand and a useful management aid.
Timber harvests on the Superior and Chippewa National Forests in Minnesota are projected to increase substantially by 2030. The increasing demand for aspen may affect the total harvests. Both forests need to give high priority to aspen management.
A BASIC language set of programs, designed for use on microcomputers, is presented. This set of programs will perform the analysis of variance for any statistical model describing either balanced or unbalanced designs. The program computes and displays the degrees of freedom, Type I sum of squares, and the mean square for the overall model, the error, and each factor...
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...
The fourth inventory of Wisconsin's timber resource shows that commercial forest area in the Southeast Survey Unit increased from 904 to 909 thousand acres between 1968 and 1983. During the same period growing-stock volume increased 37%. Highlights and statistics are presented on area, volume, growth, mortality, and removals.
The timber resource of the Southwest Wisconsin Survey Unit increased 29% in commercial forest area and increased 52% in growing-stock volume between 1968 and 1983. Highlights and statistics from the fourth inventory of this unit are presented for area, volume, growth, mortality, removals, utilization, and biomass.
Presents total aboveground ovendry biomass estimates by stratum and species for 13 plant community types located in northeastern Minnesota.
The timber resource of the Central Wisconsin Survey Unit increased 4.2% in commercial forest area and increased 75% in growing-stock volume between 1968 and 1983. Highlights and statistics from the fourth inventory of this unit are presented for area, volume, growth, mortality, removals, utilization, and biomass.
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.
Glyphosate at 1.5 to 2.0 lbs. Per acre active ingredient will control aspen suckers, shrubs, and herbs when applied during August to early September. There appears to be some intersite variability in the efficacy of the herbicide.