Treesearch

Mangroves are a vitally important natural resource on the high islands of Micronesia. This importance is especially valid in the Federated States of Micronisa (FSM) and the Republic of Palau, where mangroves cover 10-15% of the total land area and are used heavily by islanders as sources of wood, crabs, fish, thatching material, and other products.

Recreation in urban proximate wildland and wilderness areas and resulting management concerns and challenges have proven a fertile ground for social science research. As the demand for recreation opportunities adjacent to large urban centers has increased, so has the variety of recreational interests, patterns, and preferences, a reflection of the diverse recreatlonists visiting such areas.

Anticipated responses to a proposed recreation fee program were examined through the use of focus groups and self-administered questionnaires. Varied communities of interest (based on ethnicity and recreation activity groups) and communities of place (based on residency within a National Forest boundary and greater geographic proximity) were targeted for the study. Conditional acceptance, and in some cases outright disapprov-dl, were expressed during the group discussions. Social trust was revealed as the most significant predictor of anticipated impacts of new fees, general attitudes...

The effects of competing herbaceous vegetation on the growth of ponderosa pine seedlings with and without herbicide Pronone were characterized in this 1987-1990 study. Study areas were established in 36 plantations across western Montana on Champion International Corporation's timberland (currently owned by Plum Creek Timber Company). The study sites were divided into three precipitation classes; low, medium, and high. Mean percent stem volume growth was calculated for 3 years by precipitation class. Split-plot analyses of variance for precipitation class, treatment, and interaction were...

Beginning in the 1850s, logging, land clearing, and burning were used to convert high elevation Hawaiian forests to cattle pasture. Recently, declining pro®ts from ranching, the need to expand habitat for endangered species, and diminishing supplies of native saw-timber have prompted interest in restoring native forests. The Forest Service, in cooperation with the Fish and Wildlife Service, is studying climatic, edaphic, and biotic limitations in the reforestation of grassland and savanna in the Hakalau Forest National Wildlife Refuge, island of Hawaii. Frost damage has been implicated in...

The chemical composition and size of individual particles derived from combustion products of several species found in Southern California were obtained using aerosol time-of-flight mass spectrometry. The major inorganic species observed in >90% of all biomass burning particles is potassium, indicated by the atomic ion, as well as clusters containing chloride, nitrate, and sulfate ions in the mass spectra. By obtaining positive and negative ion mass spectra it is possible to identify distinct chemical marker combinations in particles resulting from the burning of plant species, which in...

Genetic diversity rarely makes headline news. Whereas species extinctions, loss of old-growth forests, and catastrophic forest fires are readily grasped public issues, genetic diversity is often perceived as arcane and academic. Yet genes are the fundamental unit of biodiversity, the raw material for evolution, and the ultimate source of all variation among plants and animals on earth (Dobzhansky 1970, Soul6 and Wilcox 1980). Why then have they escaped central attention in conservation? Although genes are pervasive, controlling individual fates and determining offspring destinies, they are...

On an average site in northern coastal California, a tanoak-mixed shrub community was given several treatments (manual release one, two, and three times; a combination chainsaw and cut surface chemical treatment; two foliar chemicals; and a tank mix of the two chemicals) to study its development over an 11-year period in both a broadcast-burned (untreated control) and released (treated) condition. The chemicals were 2,4-D, Garlon 3A, and Garlon 4, each applied two times. In addition to Douglas-fir, data are presented individually for the four most abundant and well distributed species...

The Southern California Mountains and Foothills Assessment: Habitat and Species Conservation Issues provides detailed information about current conditions and trends for ecological systems and species in the region. This information can be used by land managers to develop broad land management goals and priorities and provides the context for decisions specific to smaller geographic areas. The assessment area covers 6.1 million acres, of which 56 percent are national forest system lands. Over eighteen million people live in the coastal basin bordering the assessment area. As compared to...

Se realizó una valoración de contingencia a través de una encuesta en persona de los jefes de familia puertorriqueños, de abril a agosto de 1995, para estimar su consentimiento-parapagar por la preservación de niveles de agua en el Río Mameyes, y evitar la construcción de la represa propuesta para el Río Fajardo. El consentimiento-para-pagar anual por cada río fue de $21. Esto representa unos $110 millones para los Ríos Mameyes y Fajardo por cada millón de familias puertorriqueñas en un período de cinco años. Si se extraen 10 millones de galones de agua diaria del Río Mameyes, los recreacio...