Treesearch

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.

This report is the result of a workshop held in Denver, Colorado on April 9-11, 1991. It summarizes the current literature and techniques for using lichens to monitor air quality. Experts in lichenology and ecology contributed information on lichen floristics, characterization of monitoring sites, lichen species and communities, identifying lichen species sensitive to pollutants, active monitoring with transplants, chemical analysis of lichens, and case studies as examples of lichen biomonitoring scenarios.

Movements and habitat-use patterns were evaluated for a small population (n = 6 pairs) of Prairie Falcons (Falco mexicanus) nesting near Gillette, Wyoming. A total of 2462 falcon relocations was documented through telemetry. The average (n = 6) harmonic-mean 95%-contour home-range was 69 km2, whereas the average 75% contour was 26.6 km2. The convex polygon average home-range size was 29.4 km2. The average 95% and 75% foraging-area contours, where points less than 500 m from the eyrie were excluded, were 111.8 km2 and 57.4 km2, respectively. The convex polygon foraging area was 74.7 km2. It...

Lodgepole pine (Pinus contorta Dougl. var. latifolia) forests in the northern Rocky Mountains have experienced substantial variation in presettlement fire patterns (Arno 1976, Sneck 1977, Arno 1980, Romme 1982, Romme and Despain 1989, Barrett and Arno 1991, Barrett et a1. 1991, Barrett [in prep]). On relatively productive habitat types at lower elevations, short- to moderately long interval (25-150 yr) fires have occurred in a mixed severity pattern ranging from non-lethal underburns to total stand replacement (Arno 1976, Barrett and Arno 1991, Barrett et. al. 1991). Markedly different...