- Johnson, Alfred M
University of Maine-Orono
A study was conducted in machine-planted white pine (Pinus strobus L.,) plantations in central and southwestern Maine. The objectives of the study were (1) to determine the degree of stocking attained and (2) to establish any significant correlations which may exist between selected site factors and stocking as well as initial height growth. Measurements were taken in seventy one-acre sample areas established within sixty-two pure white pine plantations. The plantations ranged in age from two to eight years. The field data were collected between June 15 and August 15, 1959.
Average height and stocking percentage were correlated by multiple regression analysis with age, slope, aspect, and drainage class. Variables of the Ap horizon tested were thickness, percent silt plus clay, percent material over 2mm., and pH. Variables of the B horizon tested were percent silt plus clay, percent material over 2mm., pH, depth to the finest textured layer measured, and percent silt plus clay in the finest textured layer measured. Color of the top portion of the B horizon was expressed in terms of hue, value, and chroma respectively as designated by Munsell Soil Color Charts.