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Appendix E. Comparisons between alternative statistical models for assemblage measurements.

TABLE E1. Comparisons between alternative statistical models for assemblage measurements. BAR = below: aboveground biomass ratio, RII = ratio of root biomass in the 0–15 soil depth layer to that in the 16–30 depth layer, M1 = model including all main effects, M2 = model including all main effects and interactions (full model), and M3 = model including all main effects and significant interactions, as revealed by MANOVA/ANOVA analyses (see Appendix B for full MANOVA/ANOVA results). P values below 0.05 are in bold, and indicate that the addition of interactions (present in models M2 and M3) significantly increases the amount of variation explained by the model. All the analyses were conducted using S-Plus for Windows version 6.0 (Insightful Co, Seattle, Washington, USA). All the models assume a Gaussian distribution of errors.

† Results are shown for log₁₀-transformed data.

‡Log₁₀-transformed total assemblage biomass was used as a covariate in this analysis.