Treesearch

This site, selected to be representative of high-mountain wilderness ecosystems, is being used to study the effects of air pollution and atmospheric deposition In alpine and subalpine, terrestrial and aquatic biotic communities. The research program includes (a) short-term experiments designed to quantify the response of system components hypothesized to be most sensitive to changes In ozone, 8, and N air pollution and deposition; (b) development of operationally oriented models capable of predicting system, species, and biogeochemical responses; and (c) long-term biogeochemically-oriented...

This report develops a standard way of measuring and evaluating riparian conditions. These methods will be helpful to those persons documenting, monitoring, predicting, or evaluating riparian, stream, or range conditions, and how this relates to their biotic resources, especially those conditions needed to relate to impacts from land uses.

Forest vegetation classified by habitat types and community types in Colorado are tabulated. Fifteen series and 161 habitat and community types are identified. However, the habitat and community types have been grouped into fewer categories, having similar characteristics or synonymous names. Included are the name, location, relative site, successional status, tree and principal undergrowth associates, and the authority.

Presents highlights of the forest resources of Idaho as of 1981. Describes the forest resources, their extent, condition, and location, and discusses levels of some nontimber use of forest lands. Includes statistical tables: area by land classes, ownership, growing-stock and sawtimber volumes, growth, mortality, roundwood products output, utilization, and residues.

Presents land area, timberland area, woodland area, timber inventory, and growth and mortality data for 12 counties in western Colorado. Information and statistical tables are based on Forest Survey data collected from 1981 through 1984 and cover State and private forest resources.

Presents highlights of the forest resources of Colorado as of 1983. Describes the forest resources, their extent, condition, and location. Includes statistical tables: area by land classes, ownership, growing-stock and sawtimber volumes, growth, mortality, roundwood products output, and utilization.

Fourth in a series of proceedings of symposia on wildland shrubs, this publication brings together current knowledge of interactions between plants and herbivores. Topics addressed by the 31 papers include plant chemistry, palatability, nutrition and physiology, herbivore foraging behavior, and plant response to browsing.

Includes more than 90 papers bringing together research accomplishments of the last 10 years including ongoing research on the ecology and management of pinyon-juniper ecosystems. Scientist and management points of view are presented.

Data on foraging behavior are often used for examining use of habitat and describing community structure among co-occurring species of birds using the same resource base (e.g., Johnson 1966, Eckhardt 1979, Rusterholz 1981). Differences in tree species, foliage morphology, and bark structure may influence the types of prey taken and the species of bird using the substrate (e.g., Jackson 1979, Holmes and Robinson 1981, Robinson and Holmes 1984). Elucidation of foraging behaviors and tree species preferences is important if we are to determine the role of birds in forest ecosystems, and make...

A vegetation classification based on concepts and methods developed by Daubenmire was used to identify 12 forest habitat types and one shrub habitat type in the Black Hills. Included were two habitat types in the Quercus macrocarpa series, seven in the Pinus ponderosa series, one in the Populus tremuloides series, two in the Picea glaucci series, and one in the Cercocarpus montanus series. A key to identify the habitat types and the management implications associated with each are provided.