Treesearch

The current state of landscape research does not clearly direct environmental managers toward the appropriate choice of terminology to characterize and assess the aesthetic quality of particular landscape types. This study examined the ability of physical, artistic, and psychological descriptor dimensions to predict aesthetic preferences for rural river, forest, and agricultural landscape scenes. Multidimensional scaling analyses were used to identify the salient dimensions subjects used to express their aesthetic preferences for scenes within each type; these dimensions were interpreted...

To many people the term urban forest seems incongruous and contradictory. But a look around any major city quickly reveals that trees and other vegetation are an important feature in many urban settings. For example, an aerial photo survey of Dayton, Ohio, showed that 22% of the city's land area is covered with trees, and that 35% is covered with other kinds of vegetation (Sanders & Stevens, 1984). According to one overall estimate, 30% of the average city in the United States is covered with trees, a proportion larger than the average tree cover for countryside (Dwyer, Deneke, Grey, &...

Changes in the density and biomass of trees, shrubs, and herbs were measured periodically over 10 years following a progressive strip cutting and block clearcutting of northern hardwoods. At 10 years after clearcutting, yellow birch was the most numerous commercial or uncommercial tree on the block clearcut; sugar maple on the strip cut. Pin cherry dominated the biomass on the block clearcut and the first set of strips throughout the 10 years; yellow birch and sugar maple on the second and third sets of strips at 10 years.

To commemorate the 10th year of cooperation between the US-USSR in the field of environmental protection, a symposium was organized, the major objectives of which were to acquaint US-USSR scientists with project accomplishments; to promote understanding of the nature of environmental problems that relate to air pollution effect on vegetation on a more global scale; to share research priorities, interests, and methodologies; and to plan future research cooperation.

Each year more than 30 million American families bring a live Christmas tree into their homes to become the warm and glowing center of their Christmas celebration. Years ago, most Christmas trees were cut wild. But, as demand increased and the supply of suitable wild trees decreased, growing Christmas trees in plantations became more and more common.

Browsing by white-tailed deer (Odocoileus virginianus is a major cause of regeneration failure in Allegheny hardwood forests of northwestern Pennsylvania. I examined the impact of deer at 5 different densities (0, 10, 20, 40, and 80 deer/259 ha) on tree seedlings, woody shrubs, and herbaceous plants in large enclosures over 5 years. I examined 3 silvicultural treatments (clearcut, thinning, and uncut) at each density. After 5 years, tree seedlings in the clearcuts at the lowest deer densities were nearly twice as tall as those at the highest deer densities. Browsing at high deer densities...

The state of Illinois has an area of about 146,500 sq km and a population of approximately 11.5 million. Although deciduous and pine forests are found in the southern portion and along rivers and streams, most of the land area was originally tall grass prairie that has been converted to such agricultural crops as corn, sovbeans, orchards, and pastures. In certain regions, especially near Chicago, east St. Louis, and Peoria, substantial commercial and industrial development exists. Much of the state is underlain bv coal, and significant localized petroleum reserves have been identified....

The Illinois Council on Forestry Development, formerly the Illinois Commission on Forestry Development, was created by the Forestry Development Act of 1983. Although the Act included a number of specific charges, its general objective was to provide for an evaluation of the forest resources and forest industry of Illinois. Of particular importance to the Forest Resource Analysis Committee of the Council was its mandate to "determine the magnitude, nature, and extent of the State's forestry resources." This book summarizes the Committee's evaluation of the forest resources of Illinois. As a...

Although advanced technologies are available for measuring and sampling fire intensity, their costs, limitations, or complexity often preclude general use in field experiments. The lack of quality measurements exacerbates the task of relating ecological responses directly to the fires that cause them. In this paper, a new technique for measuring flame height, describing its distribution, and relating it to fire intensity is presented. Flame pulsation in natural fuels is also examined.

Both the number of trees sampled per species and the number of sampling points under each tree are important throughfall sampling considerations. Chemical loadings obtained from an urban throughfall study were used to evaluate the relative importance of both of these sampling factors in tests for determining species' differences. Power curves for detecting differences among species derived from the noncentrality parameter developed herein indicated that the number of trees sampled per species affects power more than the number of points sampled under each tree.