Treesearch

This work was undertaken under a joint fire science project "Assessing the need, costs, and potential benefits of prescribed fire and mechanical treatments to reduce fire hazard." This paper compares the future mix of timber products under two treatment scenarios for the state of Montana. We developed and demonstrated an analytical method that uses readily available tools to evaluate pre- and posttreatment stand conditions; size, species, and volume of merchantable wood removed during thinnings; size and volume of submerchantable wood cut during treatments; and financial returns of...

This report describes the origin, design, establishment and measurement procedures and first results of a large long-term cooperative study comparing a number of widely different silvicultural regimes applied to young-growth Douglas-fir (Pseudotsuga menziesii) stands managed for multiple objectives. Regimes consist of (1) conventional clearcutting followed by intermediate thinning; (2) retention of reserve trees to create a two-aged stand; (3) small patch cuts dispersed within a thinned matrix, repeated at approximately 15-year intervals to create a mosaic of age classes; (4) group...

Grade-specific price projections were once again developed for Douglas-fir, coast hem-fir, inland hem-fir, and ponderosa pine lumber. These grade-specific price projections can be used to demonstrate the returns to land management of practices that lead to high-quality logs that produce a larger proportion of high grades of lumber. The price ratios among low, medium, and high grade groupings have been consistent, and interest in these "high-quality" forestry regimes has been persistent.

This report traces the flow of California’s 2000 timber harvest through the wood-using industries; provides a description of the structure, operations, and condition of California’s primary forest products industry; and briefly summarizes timber inventory and growth. Historical wood products industry changes are discussed, as well as trends in harvest, production, and sales. Employment and worker earnings in the state’s forest products industry also are examined, and an industry leaders’ assessment of past and future operating conditions is provided.

We examined the transport of invertebrates and coarse organic detritus from headwater streams draining timber harvest units in a selective timber harvesting study, alternatives to clearcutting (ATC) in southeastern Alaska. Transport in 17 small streams (mean measured discharge range: 1.2 to 14.6 L/s) was sampled with 250- µ m-mesh drift nets in spring, summer, and fall near Hanus Bay at an ATC installation on Catherine and Baranof Islands. Samples were taken before (1996) and after (1999, 2000) nine timber harvesting treatments were applied. Invertebrate and organic detritus drift densities...

Knowledge of the habitat and host associations of Craterellus tubaeformis (winter chanterelle) is the key to understanding the ecological characteristics needed for its conservation. In this study, a survey of forest types in northwestern Oregon for mycorrhizal associates is performed and the hypotheses that stand age and the volume of well-decayed, coarse, woody debris (CWD) are significant to the standing crop biomass and the probability of C. tubaeformis occurrence are tested. Host associations were identified with polymerase chain reaction (PCR) amplification and restriction fragment-le...

We used a spatially nested hierarchy of field and remote-sensing observations and a process model, Biome-BGC, to produce a carbon budget for the forested region of Oregon, and to determine the relative influence of differences in climate and disturbance among the ecoregions on carbon stocks and fluxes. The simulations suggest that annual net uptake (net ecosystem production (NEP)) for the whole forested region (8.2 million hectares) was 13.8 Tg C (168 g C m-2yr-1), with the highest mean uptake in the Coast Range ecoregion (226 g C m-2 yr-1), and the lowest mean NEP in the East Cascades...

This report examines the growth and development of the tourism industry in Haines, Alaska, and its effects on community life and land use. It also describes the development of cruise-based tourism and its relation to shifts in local social and economic structures and patterns of land use, especially local recreation use trends. A multisited ethnographic approach was used featuring participant observation and in-depth interviews with local residents, cruise line industry personnel, and visitors to southeast Alaska. Results show that tourism brings both positive and negative changes to...

Accurate estimation of the characteristics of log resources, or coarse woody debris (CWD), is critical to effective management of wildlife and other forest resources. Despite the importance of logs as wildlife habitat, methods for sampling logs have traditionally focused on silvicultural and fire applications. These applications have emphasized estimates of log volume and weight, but wildlife applications require estimates of percent cover, density, size, and length. Given the diverse number of log variables of interest to wildlife managers, understanding the strengths and weaknesses of...

The impact of nocturnal water loss and recharge of stem water storage on predawn disequilibrium between leaf (ΨL) and soil (Ψ S) water potentials was studied in three dominant tropical savanna woody species in central Brazil (Cerrado). Sap flow continued throughout the night during the dry season and contributed from 13 to 28% of total daily transpiration. During the dry season, ΨL was substantially less negative in covered transpiring leaves, throughout the day and night than in exposed leaves. Before dawn differences in ΨL between covered and exposed leaves were about 0.4 MPa. When...