Age and Structure of a Northern Hardwood Selection Forest, 1929-1976
Abstract:Since 1938, several selection cuttings have changed a northern hardwood stand from one composed principally of sawtimber to one with a reasonably well-balanced distribution of size classes. Continual ingrowth into the small size classes promises a periodic yield. Sugar maple (Acer saccharum Marsh.) tree diameters now reflect age quite accurately; in the original tract 300-year-old trees ranged from 12 to 32 inches in d.b.h.
The average age of 20- to 24-inch trees has been reduced nearly 100 years and that of 4-inch trees from 100 years to 48. Average age-height relations are surprisingly close to the probable site index, an indication that trees are suppressed for a much shorter time than formerly. Cull percents have dropped since 1938 and the average tree quality has improved. Species composition has changed little.
Document Type: Journal Article
Affiliations: Principal Plant Physiologist at the Northern Hardwoods Laboratory, North Central Forest Experiment Station, USDA Forest Service, Marquette, Michigan
Publication date: January 1, 1977
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