Linear mixed effects model results of eucalypt productivity (total, aboveground and belowground; TB, AGB, and BGB, respectively) and biomass allocation (root to shoot ratio; R∶S) across CO₂, soil N, species pair type (monoculture vs. mixture with the non-native <i>E. nitens</i>) treatmen

In a greenhouse experiment, 28 native Tasmanian eucalypt species within two subgenera (S), Symphyomyrtus and Eucalyptus, were treated with factorial combinations of ambient or elevated CO2 (C; 420 or 700 ppm, respectively) and low or high soil N (N; 3 or 30 kg/ha/mo), and paired with a conspecific or a non-native (E. nitens) individual (M). In these models, whole-pot biomass measurements and ratios of root to shoot biomass were averaged for each native species in each treatment combination, cube root transformed, and blocked by species. P values are shown in bold and are significant at α≤0.05. δTB, total biomass; AGB, aboveground biomass; BGB, belowground biomass; R∶S, root to shoot ratio; M, species pair type (native species monoculture vs. mixture with E. nitens); C, CO2 treatment (420 or 700 ppm); N, nitrogen treatment (3 or 30 kg ha−1 mo−1). Linear mixed effects model results of eucalypt productivity (total, aboveground and belowground; TB, AGB, and BGB, respectively) and biomass allocation (root to shoot ratio; R∶S) across CO2, soil N, species pair type (monoculture vs. mixture with the non-native E. nitens) treatments and native species subgenus (N = 190).