Treesearch

Presents six papers from the technical session sponsored by the Wildlife and Fish Ecology Working Group, Society of American Foresters' Annual Convention, October19, 1988, Rochester, New York.

Many pests and other stresses affect maple trees growing in a sugarbush. Some pests can markedly reduce sap quantity; others, although conspicuous, are not important. Stresses can result from activities by people and from natural phenomena. Recognizing problems and understanding the factors that contribute to their occurrence, development, and significance are necessary to maintain tree health. This report brings together current information on the living agents and nonliving factors that can cause problems in sugarbushes. Insects, diseases, improper forest stand management, and unwise...

The assumption that aesthetically pleasing environments provide valued experiences that can improve people's quality of life underlies many government landscape policies and their resultant assessment procedures. Although the aesthetic experience has been discussed by philosophers and some psychologists, the aesthetic experience of landscapes has not been studied empirically. This research reports the results of an investigation into the nature and ecology of that experience. Twenty-five college students were given diaries consisting of structured and open-ended response formats in which...

The effects of maximum present value and maximum volume objectives on the efficiencies of alternative silvicultural systems are determined by solving any-aged management problems for mixed-conifer stands in the Northern Rocky Mountains. Any-aged management problems are formulated with periodic planting and harvesting controls and without constraints on the stand age or size structure over time. Optimization is performed with the Stand Prognosis Model, a single-tree simulator that has been calibrated for many forest types in the western United States. With a maximum present value objective,...