Treesearch

Updated tree value conversion standards (TVCS) are presented for 12 important hardwood species of the oak-hickory forest. These updated standards-developed for each species by butt-log grade, merchantable height, and diameter at breast height-reflect the changes in lumber prices and in conversion costs which have occurred since 1976 when the original TVCS were published.

Discusses the procedures used to develop a new set of hardwood-log export estimates and presents a detailed set of new hardwood-log export estimates for European and Asian markets.

Gang-ripping technology that uses a movable (floating) outer blade to eliminate unusable edgings is described, including new tenn1nology for identifying preferred and minimally acceptable strip widths. Because of the large amount of salvage required to achieve total yields, floating blade gang ripping is not recommended for boards with crook. With crook removed by crosscutting to shorter, straight pieces, fixed arbor and floating blade procedures gave similar yield results. The yields from several hundred straight boards were also similar to those for the boards with crook removed. No.1...

Gypsy moth defoliation is a serious threat to eastern hardwood forests. Felling and skidding costs for harvesting timber in silvicultural thinnings designed to reduce the impacts of the moth were evaluated. Cost of felling the nonmerchantable component of the thinnings to achieve treatment objectives are reported, along with a discussion of the economic feasibility of treatment application.

Group selection harvest studies in Eastern hardwoods have shown that economic success of such harvests rests heavily on product market values, tree quality, and logging costs (Boucher and Hall 1989; Bell 1989). Other studies have attempted to define group selection harvests and where they can be used (Roach 1974). Additional studies have documented the reproduction of hardwoods 10 years after cutting as affected by site and opening size (Minckler and Woerheide 1965). In this study, the group selection units are defined as small groups, .81 ha (2 acres) or less in area, on which most of the...

Management of our complex forest ecosystems in the economic and political climate of the 1990's is a challenge for planners, managers, and loggers. A multifunctional approach - using the research results of other disciplines and considering all forest uses and values - can improve the effectiveness of forest operations research. Since harvesting cost and revenue are closely related to changing stand attributes, harvest models must be linked with dynamic growth and yield models to accurately assess the impact of site and stand attributes on logging cost and stand management. Future harvestin...

The model is composed of four major subsystems that are driven by weather. The stand subsystem incorporates the effects of damage by the gypsy moth into annual tree diameter and height growth as well as tree mortality.

It is unclear if and precisely at what level the nuclear polyhedrosis virus (NPV) of the gypsy moth persists in its' insect host.

Instrumentation was arrayed on a 120 foot tower to detail the local atmospheric conditions during the Blackmo 88 spray experiment. Measurements were continuous for 30 minute periods encompassing each spray pass.

The use of a "User friendly" version of "GMMICRO" model to quantify the local environment and resulting core temperature of GM larvae under different conditions of canopy defoliation, different forest sites, and different weather conditions was demonstrated.