Mixed model results of variation in aboveground biomass (AGB), belowground biomass (BGB), total biomass (TB) and root:shoot (R:S) between the factors subgenus, carbon dioxide (CO₂), nitrogen (N) and all interactions, using the random term species(subgenus) to test the subgenus effect (random effect not shown).

<p>Bold underlined values are significant and degrees of freedom are denoted as subscript of each F value.