United States Department of Agriculture
Describes and illustrates a technique to mail and store diseased leaf samples to prevent deterioration or damaage.
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.
Photograph of 17 urban recreation sites in Chicago and Atlanta were evaluated by college students (n = 68) in Illinois, Georgia, and Michigan, for either perceived security, scenic quality, or both. For most raters, high visibility and developed park features significantly enhanced perceived security. Scenic quality, on the other hand, was enhanced for the majority of...
Compares effeects of various wee-control methods, including hericides, cultivation, and legume cover crop, on tree survival and height growth of 2-year-old hybrid poplars. Cultivation and herbicides singly or in combination gave consistently better results than the other treatment tested.
Describes the financial performance of red pine on site index 60, 70, and 80 lands by using new yield evidence and up-to-date cost and revenue assumptions. Best combinations of initial stocking, residual basal area after thinning, an rotation age are identified for two different financial criteria: soil expectation value and internal rate of return.
Herbicides of 17 different rates and formulations were oversprayed on newly planted 1-0 European larch seedlings in teh spring of 1983 at the recommended rates. Simazine, bifenox, oxyfluorfen, promamide, and oryzalin provided adequate weed control with no damage to the larch. Height growth at the end of the first growing season was one-and-a-half times greater in the...
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.
Species coefficients are reported for predicting individual tree survival for nine Lake States species, supplementing a previous report for 10 species. Tree attributes are diameter growth rate and diameter at breast height. Regional and local performances are summarized.
In 1981 wooded strips and windbreaks in Kansas coverd 336,000 acres and were more than 54,000 miles long. Wooded strips contained 300 million board feet of sawtimber and 92 million cubic feet of growing stock.
Two study sites in central Missouri oak-hickory forests were searched for nest sites of cavity nesting birds. Researchers located and measured 133 nests of 11 species. Cavity nesting bird habitat selection is affected by both snag characteristics and vegetation structure.
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
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.
Projected softwood shortages and high costs of mechanized tree planting indicate that more efficient planting equipment and systems are needed. This paper presents cost and productivity data for mechanically planting red pine seelings on a site previously occupied by hardwoods in northern Wisconsin
A model is described for estimating total and merchantable tree heights for Lake States tree species. It is intended to be used for compiling forest survey data and in conjunction with growth models for developing projections of tree product yield. Model coefficients are given for 25 species along with fit statistics. Supporting data sets are also described.