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The Influence of Pretreatment Forest Soil Variability on Interpretation of Posttreatment Results¹

ABSTRACT

Analysis of covariance procedures were used to evaluate differences in forest soil chemical properties among four site preparation techniques. Comparisons were made between analyses of variance adjusted with pretreatment soil chemical data used as covariates and unadjusted analysis of variance results. These comparisons indicated that failure to adjust for pretreatment spatial variation in soil chemical properties would lead to misinterpretation of the study results. This misinterpretation involved different rankings (for unadjusted vs. adjusted) of the site preparation treatment effects on soil N, P, K, Ca, and Mg concentrations.

¹ This paper originates from the School of Forestry, Louisiana Tech Univ., Ruston, LA 71272.

² Authors are, respectively, Research Associate, School of Forestry, Louisiana Tech Univ., Associate Professor, School of Forestry, Auburn Univ., and Professors, School of Forestry, Louisiana Tech Univ., Ruston, LA 71272.

Received for publication January 13, 1986.