Treesearch

Prescribed burning programs have evolved with little concern for the visual impact of burning and the potential prescribed burning can have in managing the forest scene. Recent criticisms by the public of the prescribed burning program at Sequoia National Park resulted in an outside review of the National Park fire management programs in Sequoia, Kings Canyon, and Yosemite National Parks. This paper evaluates the visual impacts of burning and of not burning in the giant sequoia-mixed conifer forest type. Alternatives to current techniques are suggested which will reduce the negative visual...

Profound changes have taken place in the western wildlands during the 20th century that will have great impact on land management policy and operations. Wildlands are being developed. Reduction of fire has altered plant species relationships in terms of dominance and density. The number of ignitions will continue to increase. The trends unchanged will result in greater resource damages. Little can be done to stem the tide of encroachment into the wildlands and its attendant increase in human caused fires. Land managers can restore the balance of plant spcies [sic] as well as fuel accumulati...

In the County of Los Angeles, critical conditions at the urban-wildland interface range from concentrated development to dispersed development; elevations from sea levelto 5000 feet with diverse ecosystems characterized by coastal sage scrub, Chamise, sumac, Ceanothus, Toyon, oak woodlands, pine forests, and desert sage; air quality impacts; sediment production; public education; and resource allocation.

Demographic and economic growth are pushing deeper into California's forest and range lands, making effective fire protection and traditional industrial uses of the land more difficult. Urban forces that will increase the difficulties in the future include: increasing urban population pressures, selective migration, low-priced housing, adequate infrastructure, decentralized development, and government inadequacies. Some compensating trends that will tend to restrict growth and minimize problems include a near-term weakening of the rural economy, few major planned developments, growth...

Two meanings of human community compete for public attention: (1) community as a sense of belonging to a particular social group within a society, and (2) community as a global ideal consisting of political expression, religious fulfillment, and/or harmony with the world at large. The latter meaning has become increasingly prevalent as we approach the year2000. This idealistic sense of community is represented in the Clementian theory of ecological succession that formed traditional fire suppression practices. Modern fire management, as practiced by the Forest Service, U.S. Department of...

National legislation has mandated the development and use of an ecological data base to improve resource decision making, while State and Federal agencies have agreed to cooperate in standardizing resource classification and inventory data. In the Pacific Southwest Region, which includes nearly 20 million acres (8.3 million ha) in California, the Forest Service, U.S. Department of Agriculture, has begun a long term project to develop an ecosystem type classification system. It will identify and describe vegetation/soil/ physiographic units called ecological types, which are site-specific...

This directory lists 392 libraries throughout the world. It includes address, phone number, librarian's name, subjects emphasized, services offered, users, name of supporting institution and is arranged by geographical region, and indexed by country and name of librarian.

Among natural resource professionals, California oaks continue to attract considerable attention. This report provides a comprehensive bibliography of the extensive but scattered oak literature. The 768 references are organized into two systems: (a) a topical outline, in which references are displayed under key word headings and subheadings, and author-date entries help to locate items by researcher or date; and (b) a Quercus species index, in which references contain serial numbers for all species and hybrids.

Although the title of our plenary session speaks generally of ""development"", virtually all of our discussion (and that in the other two plenary sessions) dealt with the effect of forest practices. That emphasis is appropriate. Seventy percent of the State's utilizable streamflow comes from commercial forest lands. An additional 25 percent of the State's water comes from--often intermingled--brush, grass, and alpine lands. It is not surprising, therefore, that concerns about cumulative impacts concerns also focus on forested lands, and specifically upon activities relating to the harvestin...

Abstract - The hydraulic characteristics of flow through channels are an important component of fish habitat. Salmonids have evolved in stream systems in which water velocity and flow depth vary spatially within the watershed and temporally on a daily, seasonal, and annual basis. Flow requirements vary during different phases of the freshwater life cycle of salmonids: free passage is necessary during migration of adults; clean and stable gravel beds ensure successful incubation of eggs; and adequate velocity and depth of flow provide space for summer rearing and overwintering. The life...