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We examine the relationship between disturbance regime and plot size for woody biomass estimation in a midwestern old-growth deciduousforestfrom 1926 to 1992. Analysis was done on the core 19.6 ac of a 50. I ac forest in which every tree 4 in. dbh and greater has been tagged and mapped since 1926. Five windows of time are compared-1926, 1976, 1981, 1986 and 1992. The most ejficient plot sizes requiring measurement of the least total area rangefrom 0.02 to 1.6 ac. A small plot size was recommended after grazing disturbance, anda large size was recommended when mortality was high andacceptable errorwas low. North. J. Appl.For. 15(4):165-168.

Plot Size Recommendations for Biomass Estimation in a Midwestern Old-Growth Forest