This revision of the 1987 silvicultural guide (Leak et al. 1987) includes updated and expanded silvicultural information on northern hardwoods as well as additional information on wildlife habitat and the management of mixed-wood and northern hardwood-oak stands. The prescription methodology is simpler and more field-oriented. This guide also includes an appendix of familiar tables and charts useful to practicing field foresters. Northern hardwood forest types can be managed as even-or uneven-aged stands using a variety of silvicultural practices. In planning these practices, there are many factors to consider including access, species composition, desired regeneration, wildlife habitat needs and environmental concerns. The aim of this document is to provide guidelines to assist the manager in choosing the right methods to meet the landowner objectives consistent with stand conditions.

Biomass and nutrient content of natural stands of northern hardwood regeneration were measured 4 years after clearcutting. Pin cherry and shrubs made up a significant proportion of the biomass in both unfertilized and fertilized stands. Yet these stands are well stocked with large numbers of desirable commercial species, especially paper and yellow birch. However, fertilizer greatly stimulated pin cherry to the detriment of the commercial species. Paper birch was the only commercial species to increase in average dry weight on the fertilized area.

Forty-three percent of 348 sugar-maple trees, Acersaccharum Marsh., in 60 plots, in four hardwood stands were injured by the sugar-maple borer, Glycobiusspeciosus (Say). The percentage of injured trees was greater in uneven-aged stands than in even-aged stands. The microorganisms isolated from discolored and decayed wood associated with borer injuries were the same as those isolated from discolored and decayed wood associated with wounds on sugar maple.

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