Treesearch

The University of Idaho Forest Research Nursery was established in 1909 to grow bareroot (field-grown) tree and shrub seedlings for conservation. In 1982, the bareroot production was phased out and replaced by growing seedlings in containers in greenhouses. The nursery emphasizes teaching, research and service. Students learn about forest planting; scientists conduct research to improve seedling quality, survival and growth; and seedlings are produced each year for the state of Idaho, private industry, and the general public. The 15-acre nursery site is located one mile east of Mountain...

This symposium focused on technologies that bridge the gap between research and its application in the management of woodlands. Topic areas include: ecology and silvicutural practices; growth, yield, and utilization potentials; livestock and grazing practices; wildlife habitat and values; and hydrology and watershed management. The proceedings include titles and abstracts of all papers in Spanish, a bibliography, and a summary of research needs.

The mountains of southeastern Arizona support a large diversity of vegetative plant communities ranging from grassland and desert scrub to spruce-fir forests. These vegetation types provide appropriate conditions for a number of species of vertebrates. Although vertebrates have been the subject of numerous studies in this region, most studies were restricted to one species, one mountain range, or one season. This limited scale of observation precludes generalizations of habitat associations between species and their environments.

Onion Park is a floristically rich naturally occurring mountain meadow and wetland complex which is surrounded by subalpine forest. The grass- and wetlands comprising the Park contribute biological diversity to an otherwise predominantly lodgepole pine-forested, subalpine setting. Onion Park is located at 7400' elevation in the Little Belt Mountains, five miles west of the town of Neihart, Meagher County, Montana. It is within the USDA Forest Service Tenderfoot Creek Experiment Forest on the Lewis and Clark National Forest. A 1,173 acre Research Natural Area (RNA) encompassing Onion Park...

To better understand the properties of ice surfaces at different temperatures, the adsorption of a relatively insoluble gas, NO, was studied using a continuous-flow column experiment. Adsorption isotherms for NO on the surface of ice were measured for a temperature range of-1 to -70°C and a concentration range of 10 to 250 ppbv. Very little adsorption was measured; surface concentrations were near the detection limit of +- 10-10 g m-2, limiting the precision of the data. Although a relatively large proportion of ice-ice surfaces were present, no grain boundary effect was detectable. NO...

A study of mean wind speeds and directions has been completed in the Snowy Range of Southern Wyoming, U.S.A. It was conducted in a subalpine ecosystem at an altitude of 3 200 m to 3 400 m above sea level during the summers of 1988 and 1989. Indexes of deformation and axes of asymmetry due to wind shaping of Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa) are related to wind speeds and directions on a 100 m x 100 m grid spacing over the 300 ha research site. Isotach and airflow patterns are drawn to represent climatological near-ground-level winds.

Studies were conducted on 27 species of alpine plants to test the hypothesis that structural characteristics of leaves have a predictable influence on the amount of moisture retained by a plant crown following a simulated rain event. The retention of precipitation in crowns has been previously demonstrated as one factor potentially contributing to the direct effects of acid rain on alpine plants. The results of this study demonstrate that a significant share of the amount of water retained could be explained by general structural features of leaves and flowers common to all the diverse...

Proper management of the valuable data from remeasured (or permanent) forest growth plots with data base management systems (DBMS) can greatly add to their utility. Twelve desired features for such a system (activities that facilitate the storage, accuracy, and use of the data for analysis) are described and used to evaluate the 36 systems found by a survey conducted in 1988. Most of the systems hag some positive characteristics, but none fully implemented all of the desired features. Additional DBMS features, which respondents of the survey noted would be desirable, are also summarized.

In the fall of 1990, a major program for the conservation of migratory landbirds that breed in North America and winter in Latin America and the Caribbean Basin was initiated. Numerous federal, state. and private organizations in the United States endorsed the initiative by signing an official agreement to cooperatively conserve populations of neotropical migratory birds. These include the U.S. Fish and Wildlife Service, the U.S. Forest Service, Bureau of Land Management, National Park Service, Agency for International Development, Department of Defense, National Audubon Society, The...

Mas de 250 especies de aves terrestres migran a Norte America durante la epoca reproductiva para aprovechar los sistemas templados. No obstante, las aves migratorias neotropicales pasan la mayor parte de su ciclo de vida en los habitat tropicales y subtropicales de paises latinoamericanos y caribefios donde viven en una asociacion cercana con las aves residentes. Para su supervivencia, muchas especies migratorias dependen de los ecosistemas tropicales. Aunque existe informacion sobre la biologia reproductiva de las aves migratorias, hay poca informacion disponible sobre la distribucion,...