Treesearch

This paper develops regional recreation supply and demand projections, by combining coefficients from the national 1989 RPA Assessment models with regional regressor values. Regional recreation opportunity estimates also are developed, based on regional travel behavior. Results show important regional variations in projections of recreation opportunities, trip supply, and trip demand.

A taxonomic treatment of aquatic and wetland vascular plants has been developed as a tool for identifying over 500 plant species inhabiting wetlands of the northern Great Plains region. The treatment provides dichotomous keys and botanical descriptions to facilitate identification of all included taxa. Illustrations are also provided for selected species. Geographical ranges and habitat preferences are described for each species, and a map is provided for each plant showing its documented occurrences by counties within the region. Additional information provided with species descriptions...

Elements in bull trout biology, population dynamics, habitat, and biotic interactions important to conservation of the species are identified. Bull trout appear to have more specific habitat requirements than other salmonids, but no critical thresholds of acceptable habitat condition were found. Size, temporal variation, and spatial distribution are likely to influence the stability of local and regional populations. Disruption of key habitat characteristics threatens the persistence of local populations, and isolated populations are not likely to persist indefinitely. Conservation of bull...

In previous work a solution was developed for the kinematic wave overland flow equation with rainfall excess given by Philip's infiltration equation. Subsequent application of this solution to field data from small plots revealed the need for an improved model. The principal requirement is the incorporation of depression storage into the rising limb calculation. A second requirement is a more precise approximation of the water surface profile at the end of rainfall. This improves the falling limb calculations. This paper shows the solutions obtained by incorporating these improvements and...

Presents highlights of Nevada forest resources as of 1989. Describes the extent, condition, and location of the State's timberland and woodland, includes statistical tables: area by land classes, ownership, wood volumes, growth, mortality, and products. Maps show location by timberland, woodland, and owner group.

Includes 41 papers and accounts of field trips from a symposium focused on riparian shrub communities and their habitats. Papers discuss values, classification methods, conditions, and rehabilitation techniques for riparian areas, with one section devoted to similar topics for upland shrubs.

A simple regional habitat model founded on the relation between vertical habitat complexity and species richness has been used to describe wildlife habitat in response to macroscale patterns in land use and land cover. While the model has a basis in ecological theory, it has not been subjected to rigorous testing. We evaluated the model’s fundamental assumption on landscapes in the eastern forested region of the United States and found the model to be supported when we used a measure of avian community integrity during the breeding season. The model was improved by incorporating measures...

Wildlife management and policy decisions are increasingly being made at the regional, national and international level. Much of the motivation for extending the geographic context of resource planning comes from U.S. federal laws that require resource managing agencies to examine the potential impacts from land resource use on wildlife resources. Several regional approaches have demonstrated the feasibility of using extant resource inventories in developing wildlife habitat models. While testing for feasibility is a logical first step in the development of large-scale resource response...

Provides information on fire as an ecological factor in the forest habitat types occurring in eastern Idaho and western Wyoming. Identifies Fire Groups based on fire's role in forest succession. Describes forest fuels and suggests considerations for fire management.

This paper reviews the science and management of old-growth forests and summarizes discussions among 30 participants at a workshop in Portal, Arizona, March 9-13, 1992. Concepts of old-growth forests - the perceptions, values, definitions, characteristic features, ecological functions, and landscape importance - vary widely. Because concepts are complex, scientists, resource managers, and the public will continue to bring old growth into clearer focus as knowledge is gained. Regardless of the concepts chosen for viewing old growth, on an ecological basis old-growth forests represent a...