ANOVA results of the most parsimonious linear fixed effects model.

Grass biomass is the dependent variable while fixed effects are distance from the base of the tree, tree height, and rainfall. The model includes random effects of individual trees, nested in tree species identity, nested within strings nested in geology (see statistical analysis). Significant p-values are bolded. The three-way interaction between Rainfall∶Distance∶Height as well as the two-way interaction between Distance∶Height were included in the maximal model but were simplified as non significant. According to our results, tree height is not a significant contributor per se, but the interaction between Rainfall∶Site is marginally significant. Thus, height is a potentially significant contributor depending on rainfall. Given the fact that Table 2 shows 2 two-way interactions as significant, (Rainfall∶Distance and Rainfall∶Height) we need two figures to assess this. Figure 1 shows the relationship between Rainfall∶Distance and Figure 2 between Rainfall∶Height.