Quantitative Evaluation of Site Potential for Spruce and Fir in Newfoundland

Abstract

This paper examines relationships between site index of black spruce and balsam fir and soil and topographic characteristics in two areas of Newfoundland. One hundred three quantitative variables were examined on 300 sample plots by multiple regression and principal component analysis. Equations, accounting for at least 60 percent of observed variation, were derived for predicting site index from soil and topographic characteristics. Soil moisture was most important, with soil nutrient status being of less, and topography of least, importance. Principal component analysis did not exceed multiple regression analysis in predictive ability, but was valuable in aiding biological interpretation of regression. Forest Sci. 22:131-143.