- Johnson, James E.
University of Maine Graduate School
A study was made to determine the effect of age, site index, and stand density on the cubic-foot yield per acre and average tree size of even aged sample plots, representing a wide variety of age classes, site qualities, and densities, were located in suitable natural stands. Measurements on each plot included percent slope, aspect, elevation, drainage, indicator plant spectrum, abundance and frequency of tree regeneration, point sample for basal area, mortality, and tree tally by species, crown position, and diameter breast height. Measurements on each overstory tree included total height, length of the live crown, crown diameter, number of cones, five-year height growth, diameter, and bark thickness at four foot intervals along the bole, and five and ten year periodic diameter growth at breast height.