Efficiency of sampling tree regeneration with two plot sizes in northern Arizona

Abstract

Two circular plot sizes, 1/300 and 1/100 ac, were compared to determine which plot size was the most efficient for use in ponderosa pine forests on the Coconino National Forest, Arizona. Eighteen harvested stands were selected for sampling, and regeneration plots were installed in each stand. The two plot sizes were overlaid on each plot center and data were recorded separately for each plot size. For each stand the expected total sampling time was calculated and used to determine which plot size required the least sampling effort while providing the same precision of estimated seedling densities. We found that the 1/300-ac plot size was the most efficient plot size for sampling tree regeneration. Copyright © 2012 by the Society of American Foresters.