Treesearch

These eight papers were presented at Working Party S6.01-3, XVIth World Congress of the International Union of Forestry Research Organizations, Oslo, Norway, June 22, 1976. Topics covered include (a) improving studies on demand for outdoor recreation, (b) forecasting changes in number of visitors after a change in recreational quality at an area, (c) comparing the use of site surveys with home interviews for recreation planning, (d) measuring the relative value of selected outdoor recreation activity areas, (e) model ing changes in use or area conditions to determine effects on use...

Abstract - A crucial factor in the stability of steep forested slopes is the role of plant roots in maintaining the shear strength of soil mantles. Roots add strength to the soil by vertically anchoring through the soil mass into failures in the bedrock and by laterally tying the slope together across zones of weakness or instability. Once the covering vegetation is removed, these roots deteriorate and much of the soil strength is lost. Measurements of change in strength of roots remaining in the soil after logging at Staney Creek on Prince of Wales Island, south-east Alaska, indicate that...

Lists 177 references, including most of the available citations on tanoak (Lithocarpus densiflorus [Hook. & Am.] Rehd.), with major emphasis on dendrology, synecology, diseases, chemical control, seasoning, and uses of the wood.

This exploratory study indicated that considerable variation in the moisture content of litter can occur within short horizontal distances. The variations ere found to be caused primarily by differences in the amount of solar radiation received by the litter and in the degree of cooling by radiation at night. Because actual fuel moisture lags behind equilibrium moisture, the history of the previous exposure of an area to solar radiation is more important in determining the litter moisture at any given time than the conditions at that time. The variations were affected by timber stand...

To investigate local adaptation to soil fertility, seeds were collected from trees in natural stands selected on one fertile and one nearby ultramafic soil in four geographic areas in the northern Sierra Nevada. Germinants from all seed parents in an area were planted in soils dug from the A horizon of both parent stands. Seedling growth on the fertile and ultramafic soils suggested no specific adaptation ofparent stands to native soil. For every stand, the growth of seedlings from individual trees varied widely on both soils. Differences among families were highly significant, and...

Observations of fire-related behavior of wildland visitors were made in three types of areas-wilderness, established campground, and built-up commercial and residential areas-within the San Bernardino National Forest, California. Interviews were conducted with all persons so observed. Types of fire-related behavior differed markedly from one area to another, as did the proportions of observed proper and hnproper use of fire. Persons who misused fire could not be distinguished from those who did not, when interview data were analyzed in relation to selected social and demographic characteris...

Vegetation that is low-growing and either low in volume, slow burning, or both, is needed for reduction of fire hazard on fuelbreaks and other brush cleared areas in California. Of over 50 shrub species and many grass species that were test planted, about 20 shrubs and an equal number of grasses were chosen for plot and field trials. Creeping sage, a few saltbushes, and a few grasses-mostly perennials-are adapted within the wide range of chaparral site conditions, and were successfully established by direct seedings as well as by other cultural methods on these sites. Shrub test results...