Treesearch

Presents a method of quantitatively representing the mosaic of stand types on a small landscape in the subalpine lodgepole pine forest type. The method utilizes macroplots placed systematically on a transect grid. Structure and composition of both current and past stands are inventoried. Procedures for data analysis and interpretation are illustrated for a lodgepole pine landscape in Montana.

Conifer establishment following regeneration timber harvests is predicted by version 2 of the Regeneration Establishment Model, a submodel of the Prognosis Model. The regeneration model covers 1 O species for forests in Montana, central Idaho, and northern Idaho. Most harvest and site preparation methods can be simulated so that alternative treatments can be evaluated. Also included in the model is the influence of western spruce budworm (Choristoneura occidentalis) on regeneration success. The model predicts the probability of stocking, seedling density, species composition, and seedling...

Presents highlights of the forest resource in Montana as of 1989. Describes the extent, condition, and location of the State's forests with particular emphasis on timberland. Includes statistical tables: area by land classes, ownership, and forest type; growing-stock and sawtimber volumes, growth, mortality, and removals for timberland.

Presents land area, timberland and woodland area, associated volume, and components of change for the forest lands of New Mexico.

A capital accounting approach is used to measure the net effects of land area change, forest type conversion, and direct investment on timber assets in the U.S. South from 1952 to 1992. The resulting measure of net forest investment indicates asset growth on the lands held by forest industry but net disinvestment on all other private lands. Results also reflect uncertainty about investment and production from this latter group. The historical analysis informs projections of forest investment to the year 2040.

Financial anaylses of intensive and low-cost reforestation options are conducted for two predominant timber types in the United States: loblolly pine (Pinus taeda L.) stands with hardwood competition in the South, and Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and red alder (Alnus rubra Bong.) stands in the Pacific Northwest. Results show that the expected present values (EPVs) of low-cost options that result in mixtures of conifers and hardwoods are superior, in some situations, to the EPVs of the intensive options. For the loblolly pine type, the low-cost option is superior when...

Continuing conversion of woodlands, greater restrictions on recreational access, and subdivision are trends seeming to have important implications for future recreation supply. Little is known about the possible effects of these trends on future recreational potential and use of private rural lands. This report presents the findings of a survey of landowners in Indiana, Georgia, and New York that was done to help clarify the effects of subdivision and access restrictions on recreational findings and use.

World forest resource data as of 1990 are summarized, and patterns of forest use are briefly described. Forest resource conditions and use in the United States are compared to global data. Global forestry issues for developed and developing countries are discussed, and two issues specific to the United States are examined. The first is whether U.S. forest resource policies cause environmental problems in other countries. The second is consideration of the elements of U.S. experience with forests that can be transfered to benefit other countries, especially developing countries.

Long-term radial growth trends of ponderosa pine (Pinus ponderosa var. scopuforum) were studied in second-growth stands in the Front Range of the Colorado Rocky Mountains to determine if there has been any impact from oxidant air pollution. Although ozone concentrations are relatively high at some locations, visible pollutant injury was not found in any trees. Time series of basal area increments are generally homogeneous within stands. Concurrent periods of increasing and decreasing growth can be found in stands throughout the Front Range, which indicates that there are temporal growth...

Debate over the classification, protection, and management of forested wetlands has intensified in recent years. Federal agencies have classified US wetlands in various manners, leading to frequent protests by groups favoring more or less stringent criteria. In addition, wetland issues have faced an evolving scope of federal water pollution laws applying to wetland regulation; a unified federal wetland delineation manual whose implementation was opposed by the executive branch and some members of Congress; and introduction of bills to redefine wetlands.