Treesearch

More than 12,300 moths and 2,500 carabid beetles were trapped during 3 years (1993 through 1995) in two different ecological land type phases (ELTP's) in the Huron-Manistee National Forest in Michigan. One ELTP (no. 20) was dominated by oaks, and the other (no. 45) was dominated by sugar maple; each had distinctive kinds of insects, in spite of the fact that many species were shared. Collection dates, trapping method, and the total abundances of each of the 489 moth species, and each of the 59 carabid species are reported.

This publication contains 52 research papers about the population ecology and management of forest insect defoliators. These papers were presented at a joint meeting of working parties S7.03.06, "Integrated Management of Forest Defoliating Insects", and S7.03.07, "Population dynamics of forest insects", of the International Union of Forestry Research Organizations (IUFRO). The meeting was held August 18-23, 1996, in BanskA Stiavnica, Slovak Republic.

We analyzed a statewide species database together with a county-level geographic information system to build a model based on well-surveyed areas to estimate species richness in less surveyed counties. The model involved GIS (Arc/Info) and statistics (S-PLUS), including spatial statistics (S+SpatialStats).

Since the mid 1980s, increased public scrutiny of timber sales in national forests and changes in Forest Service policy have resulted in delayed or reduced sales of hardwood sawtimber. As a result, the hardwood industry has become increasingly concerned about future supplies of timber from national forests. On the surface, these concerns seem difficult to understand since national forests contain only 7 percent of the nation's hardwood sawtimber. To determine the validity of these concerns, the relative quality of sawtimber on national forest lands was compared with that on adjacent lands...

Every sawmiller who has been in business more than 5 years realizes that hardwood stumpage prices tend to increase faster than lumber prices, decreasing the margin between these two prices. Although increases in stumpage versus lumber prices are readily apparent, the reason for the decrease in the margin is not. Recent research findings indicate that the stumpage/lumber market margin is decreasing as sawmills become more efficient. During a given year, progressive sawmills adopt new production technologies and marketing procedures in an effort to increase profits. Other mills implement...

New manufacturing technologies or concepts often are adopted to improve a firm's competitive advantage over other firms in the same industry. The benefits that a firm expects to receive as a result of that adoption are presumed to outweigh the risk factors that accompany the adoption of a new manufacturing technology. Much research has been conducted to characterize firms that adopt new technologies early inthe technology's life cycle and to identify the expected benefits that most significantly affect a firm's decision to adopt a new technology or concept. However, very little research...

The inclusion of character marks in furniture parts increases part yield at least as much as previously estimated by industrial practitioners and scientists specializing in yield efficiency. However, character-marked furniture is uncommon in the more popular North American furniture species and designs. Opportunities for extending the hardwood resource associated with using more of wood's natural character in secondary wood products can be more easily implemented today than a decade ago, given the advent of computer-supported sawing systems. In this study, the yield increases associated...