United States Department of Agriculture
Describes a network of short-rotation, Populus research and demonstration plantations that has been established across a 5-state region in the north-central U.S. to identify suitable hybrid poplar clones for large-scale biomass plantations in the region. Reports 6-year results.
Nearly 2,000 foreign plants and 2,000 foreign insect species have become naturalized in North America during the past 500 years. This publication documents those immigrant phytophagous insect species which have become established on woody plants or their products in the continental United States and Canada. Of these 368 immigrant insects, 72% came from Europe.
Provides summary of management recommendations relating to biological diversity.
Reports that both forest floor removal and soil compaction significantly reduced biomass and height of 2-year-old aspen suckers in plots in northern Minnesota.
Presents herbaceous legumes as an alternative to herbicides in forestry. Discusses benefits associated with the capability of legumes to control weeds and promote the growth of young trees.
Gives procedures for the field identification of birdseye in standing sugar maple (Acer saccharum Marsh.) trees.
Describes Geo-CLM, a computer application (for Mac or DOS) whose primary aim is to perform multiple kriging runs to interpolate the historic climatic record at research plots in the Lake States. It is an exploration and analysis tool. Addition capabilities include climatic databases, a flexible test mode, cross validation, lat/long conversion, English/metric units,...
Brown-headed Cowbirds (Molothrus ater) are an obligate brood parasite and a potential threat to some populations of migratory songbirds. I used radio-telemetry to study temporal patterns in behavior, habitat use, and sociality, as well as spatial patterns and movements among breeding, feeding, and roosting areas. I obtained a mean of 42 locations of...
The 1987 Resources Planning Act (RPA) Assessment was conducted to provide current information on the nation's forests. Resource tables present estimates of forest area, volume, mortality, growth, removals, and timber products output in various ways, such as by ownership, region, or state. Statistics are provided in a metric format for international use.
Fractal geometry is a tool for describing and analyzing irregularity. Because most of what we measure in the forest is discontinuous, jagged, and fragmented, fractal geometry has potential for improving the precision of measurement and description. This study reviews the literature on fractal geometry and its applications to forest measurements.
Summarizes the shortcomings of current natural resource accounting systems, outlines some of the features needed, and proposes an accounting framework that would help integrate economic and ecological factors. Such a system of forest resource accounting is urgently needed to achieve the sustainable goals of ecosystem management.
Reports the results of a survey of 1,809 Forest Service employees to obtain their views about the Agency's mission and program direction.
Reviews the state-of-the-art knowledge about northern red oak shoot growth patterns, flowering, carbon allocation, and silviculture.
Stand management activites influence (1) tree growth and quality; (2) stand structure, stocking and composition; (3) wildlife and aquatic habitat quality; and (4) long-term site productivity. The cumulative impacts of stand-level treatments affect ecosystem structure and function at the landscape level.
This international proceedings focuses on the biology, ecology, and evolution of gall-forming insects and their uniquely specialized relationships with their host plants. The individual contributions range in scope from detailed descriptive to profoundly theoretical, synthetic studies. One underlying theme of the proceedings is the important contribution of knowledge...
Briefly describes the disease of butternut caused by Sirococcus clavigignenti-juglandacearum and provides suggestions for conserving resistant butternut, including guidelines for natural and artificial regeneration.
The fifth inventory of Michigan's Western Upper Peninsula Unit reports 12,329.1 million acres of land, of which 4,836.5 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 ownership.
The Southern U.S. pulpwood harvesting industry experienced substantial changes in productivity and logging costs from 1979 to 1987. This research measures physical and economic changes in southern timber harvesting and the degree of industry shifting between different levels of harvesting mechanization.
Poplar leaf nitrogen should generally be maintained at more than 3%, but concentration varies with clonal parentage, tree age, year, and site. Recommendations are given for establishing a fertility monitoring program.
The group selection method combines some of the advantages of even-aged silvicultural methods with those of uneven-aged methods. The method maintains a fairly continuous tree canopy, which provides a more natural appearance to the forest than does any even-aged method. By creating small canopy openings, it also provides the light necessary for the growth of species...