Treesearch

Songbird populations can be related to habitat components by a method that allows the simultaneous determination of habitat requirements for a variety of species . Through correlation and multiple-regression analyses, 10 bird species were studied in a suburban habitat, which was stratified according to human density. Variables used to account for bird distribution included aspects of vegetation, human activity, and structures.

The economic impacts of a gypsy moth infestation on homeowners and on managers of recreation areas (commercial, public, and quasi-public) were determined from data collected via interviews with 540 homeowners and 170 managers of recreation areas in New York and Pennsylvania. The approach to measuring the impact of gypsy moth was to determine the interaction of a specific effect of an infestation (tree defoliation, tree mortality, nuisance) with a specific ownership objective (the reason a person has for owning or managing a property). Data were also collected on costs of controlling the...

Discusses 1975 pulpwood production and receipts and recent production trends in the Lake States and Central States. Gives pulpwood production in the Lake States by species for each county and compares production by Forest Survey Unit with that of previous years. Presents 1975 pulpwood and receipts data by state for the Central States, and shows four production classes by county.

Prescribed fires in mature red pine stands reduced shrub competition and the organic layer thickness. The fires reduced nutrient in the forest floor, increased them in the mineral soil, but had no effect on overstory growth.

Simulating natural damage to leaders of forest-grown seedlings of yellow birch and sugar maple resulted in no loss of vigor but a loss in net height growth. Leader elongation depended upon seedling, shoot, and bud characteristics rather than on the extent of damage.

Reports results of fertilizing and thinning pole-size sugar maple and yellow birch crop trees on six different sites. Thinning significantly increased diameter growth, but fertilization did not. Crop trees on moist (moderately well-drained) soils have tended to respond to fertilization. Discusses silvicultural implications.

A set of value concepts and methods for appraising both values-at-risk and change in value resulting from wildfire are presented. Emphasis is placed on the effects of forest fires in terms of their affects on human and organization goal achievement. Fire effects that help achieve goals are beneficial; those that hinder goal achievement are undesirable and create damage.

The decline of martens in Minnesota is reviewed and a recent increase documented. Adjacent and partially overlapping home ranges of 4.3 to 19.9 km2 were determined by telemetry for a female and three males. Habitat use is described. If current trapping and timber management practices persist, martens should continue to increase.

Presents volume, characteristics, disposal, and uses for wood residues from secondary wood manufacturing plants in Minneapolis-St. Paul, Minnesota.

Reviews silvical and silvicultural information about natural regeneration pertinent to forestry practices in Lake State northern hardwood types. Seed production; effects of light, moisture, temperature and competition on establishment and growth; and how damage affects mortality rates and form are covered. Clearcutting, selection, and shelterwood experiments are discussed.