Treesearch

The eastern hemlock type is declining in area faster than any other. Growing-stock volume, for example, declined 71 percent in only 20 years in Michigan, and has declined similarly in Wisconsin. Many land management agencies have stopped cutting hemlock until satisfactory regeneration can be assured.

The future of the yellow birch supply in the Lake States is uncertain. Growing-stock volume has declined more than one third since 1963, prompting the search for better ways to handle the difficult job of regenerating the species.

Single-tree selection "works" in sugar maple stands in the Lake States. This system of all-age management has been used for 31 years on the Argonne Experimental Forest. In 1953, researchers found that cutting according to basal area guides is both a convenient and effective way to regulate a stand. Later experience showed that achieving good stand structure could be speeded by using a separate basal area guide for each of three sawtimber size classes, instead of lumping them into one sawtimber class.

Balancing the C budget in the tropics has been hindered by the assumption that those forests not undergoing deforestation are in C steady state with respect to their C pools and thus with the atmosphere. The long history of human activity in tropical forests suggests otherwise. In this paper we discuss the forest compartments into which C can be stored, what the likely rates of storage are and for how long, and over which areas of the tropical landscape these processes occur. Results of our analysis suggest that tropical forests have the potential to sequester up to 2.5 Pg C yr-1 from the...

Increased aluminum (Al) solubility in soil waters due to acid precipitation has aroused considerable interest in the problem of Al toxicity in plants. In the present study, an in vitro suspension culture system of Catharanthus roseus (L.) G. Don was used to analyze the effects of aluminum on several biochemical processes in these cells. The aliphatic polyamines, spermine and spermidine, and their precursor, putrescine, have been implicated in a number of stress responses of plants. Addition of 0.2, 0.5 or 1.0 mM AlCl3, to cells cultured for 3 days caused a small but significant increase in...

Provides current and historical information on primary and secondary hardwood product production, prices, international trade, and employment.

Provides current and historical information on primary and secondary hardwood product production, prices, international trade, and employment.

Provides current and historical information on primary and secondary hardwood product production, prices, international trade, and employment.

A statistical report based on a survey of primary wood manufacturers using wood from Kentucky. Contains statistics on production and consumption of industrial forest products by species, geographic units, and state; and production and disposition of manufacturing residues. Includes graphics and statistical tables showing current and historical data.

This periodic report contains 1989 information compiled from a canvass of all primary manufacturers that use roundwood harvested in Ohio. In 1989, 89 million cubic feet of roundwood was harvested in Ohio. Included in this figure is 382 million board feet of sawlogs and 361,500 cords of wood used for pulpwood.