Table 2 P values from ANOVA on the effects of CO₂ concentration, belowground competition (BGC), nutrient supply (N) and species (S) on photosynthesis (P_n), photosynthetic water use efficiency (WUE), maximum rate of Rubisco carboxylation (V_cmax), and maximum rate of photosynthetic electron transport (J_max) in black spruce and white spruce seedlings. The seedlings were exposed to two CO₂ concentrations (380 and 720 µmol mol⁻¹) with and belowground competition at two nutrient levels. Probabilities ≤ 0.05 were underlined and bold-faced

From: High nutrient supply and interspecific belowground competition enhance the relative performance of Picea mariana (Mill). B.S.P seedlings over Picea glauca [Moench] Voss. under elevated CO₂