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 (ra

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