Treesearch

This proceedings of Aspen Symposium `89 contains 31 papers balanced between the subjects of aspen ecology and silvics, aspen management and silviculture, and aspen products and utilization. It also includes eight brief papers based on poster presentations.

ECOPHYS is an ecophysiological whole-tree growth process model designed to simulate the growth of poplar in the establishment year. This microcomputer-based model may be used to test the influence of genetically determined physiological or morphological attributes on plant growth. This manual describes the installation, file structures, and operational procedures for using the model.

Reports on the survival and growth of a 46-year-old tamarack plantation on an upland site.

A network of hybrid poplar short-rotation plantations was established across the north-central region of the U.S. during 1986-1988. This paper documents the greater than expected early yields from these plantations and dicusses potential yields and uncertainties surrounding potential yield estimates.

Computer simulation was used to gang rip No. 1 and No. 2 Common red oak boards before and after removal of crook. While No. 1 Common produced slightly more total yield, the part yields were very similar. No. 1 Common was superior only in yielding 75-inch-long pieces. Either grade is an excellent choice for the furniture and cabinet industries.

This annual report contains 1988 information compiled from a canvass of all pulpmills that use pulpwood produced in the 14 Northeastern states. In 1988, total production reached 9,648,800 cords, an increase of 3 percent since 1987. Pulpwood from roundwood was 6,749,800 cords and pulpwood from manufacturing residues was 2,899,000 cord equivalents. Receipts of pulpwood at mills in the region were 10,133,600 cords.

Forest managers, loggers, land-use planners, and other decision makers need an understanding of estimating the cost of protecting wetlands using cable logging systems to harvest timber products. Results suggest that protection costs can range from $245 to $490 per acre depending on the degree of protection desired.

Applications of timber harvesting system simulation to the economic analysis of forest management and wood utilization practices are presented. These applications include estimating thinning revenue by stand age, estimating impacts of minimum merchantable tree diameter on harvesting revenue, and evaluating wood utilization alternatives relative to pulpwood quotas and harvesting revenue.

Forest managers, loggers, land-use planners, and other decision makers need an understanding of estimating the cost of protecting wetlands using cable logging systems to harvest timber products. Results suggest that protection costs can range from $244.75 to $489.50 per acre depending on the degree of protection desired.

Research results and ongoing research activities in oak plantings and related physiology and genetics studies are described in 30 abstracts.