Treesearch

Contains 38 oral presentation abstracts, 34 poster abstracts, and 18 manuscripts on applications of biotechnology to tree research in the areas of stress resistance, protection, and wood utilization presented at an international conference in Bloomington, Minnesota, October 2-6, 1994.

Presents yields in number of trees, basal area, diameter distribution, and total commercial volumes 38 years after thinning a black spruce sapling stand.

Pulpwood production in the Lake States increased to 8.8 million cords in 1992. Michigan, Minnesota, and Wisconsin pulpwood production is shown by county and species group.

A fast and reliable method for the extraction of cellular polyamines and major inorganic ions (Ca, Mg, Mn, K, and P) from several plant tissues is described. The method involves repeated freezing and thawing of samples instead of homogenization. The efficiency of extraction of both the polyamines and inorganic ions by these two methods was compared for 10 different tissues. In each case, the freeze-thaw procedure resulted in a precise and quantitatively equal, or greater, yield than homogenization. Freeze-thawing not only eliminates the need for various tissue homogenizers (such as...

Hardwood lumber production increased by nearly 1.8 billion board feet between 1986 and 1990 and decreased sharply in 1991. However, not all areas of the country experienced the same growth in hardwood lumber production during the 1980s. While lumber production in inland regions of the eastern United States and the west increased during the 1980s, lumber output in regions adjacent to the Atlantic and Gulf Coasts remained steady or declined. This paper examines changes in hardwood lumber production and the impact of changing domestic and international demands on these changes.

A method for combining Landsat Thematic Mapper (TM), Advanced Very High Resolution Radiometer (AVHRR) imagery, and other biogeographic data to estimate forest cover over large regions is applied and evaluated at two locations. In this method, TM data are used to classify a small area (calibration center) into forest/nonforest; the resulting forest cover map is then used in combination with AVHRR spectral data from the same area to develop an empirical relationship between percent forest cover and AVHRR pixel spectral signature; the resultant regression relationship between AVHRR band...

Describes one approach to ecologically based classification of upland forest community types of the White and Green Mountain physiographic regions. The classification approach is based on an intensive statistical analysis of the relationship between the communities and soil-site factors. Discriminant functions useful in distinguishing between types based on soil-site factors most strongly correlated with their distribution over the landscape are presented.

Eastern hardwood forests are now managed to meet a wide range of objectives, resulting in the need for silvicultural alternatives that provide timber, wildlife, aesthetics, recreation, and other benefits. However, forest management practices must continue to be efficient in terms of profiting from current harvests, protecting the environment, and sustaining production of desired benefits in the future. This paper evaluates four major silvicultural practices used to manage eastern hardwoods: single-tree selection, group selection, two-age management, and even-age management. The analysis...

Originally diminished by development, forests are coming back: forest biomass is accumulating. Forests are repositories for many threatened species. Even with increased standing timber, however, biodiversity is threatened by increased forest fragmentation and by exotic species.