- Haag, David Charles
University of Maine Graduate School
The relationship of four site indices and nine growth parameters of even aged spruce fir stands in eastern Maine to site and stand variables was determined from data collected on 50 sample plots. Regression of site indices and growth parameters on only site variables and on both site and stand variables were formulated. Site variables included percent slope, aspect, hydrogen ion concentration and thickness of the 01, 02, A, B, and C soil horizons, depth to a pan, depth to drainage mottles, depth of rooting, percent organic matter content in the A, B, and C soil horizons, variance in thickness within and between samples of the 01 and 02 horizons, and transformations and interactions of the above variables. Stand variables included age at breast height of overstory trees, basal area of the total stand, average height of the overstory trees, bole-wood volume, including bark, of the overstory stratum and of the total stand, and stand density.