Figure 3

Total PLFA (a), bacterial PLFA (b), fungal PLFA (c), G⁺ PLFA (d), G⁻ PLFA (e), fungal/bacterial PLFA (f), and G⁺/G⁻ PLFA (g) in the rhizosphere and bulk soil in the treatments. Different lowercase letters indicate significant differences between treatments in the rhizosphere, and different uppercase letters indicate significant differences between treatments in the bulk soil. AN0, ambient CO₂ and no N added; AN1 ambient CO₂ and N supply at a rate of 2.5 g N m⁻² y⁻¹; AN2, ambient CO₂ and N supply at a rate of 5 g N m⁻² y⁻¹; EN0, elevated CO₂ and no N added; EN1, elevated CO₂ and N supply at a rate of 2.5 g N m⁻² y⁻¹; EN2, elevated CO₂ and N supply at a rate of 5 g N m⁻² y⁻¹.