Fig. 3From: Linking changes of forage production and digestibility with grassland community assembly under nitrogen enrichmentEffects of nitrogen addition and mowing on plant Ca+Mg concentrations averaged across the whole community (a), forbs (b), and grasses (c). N0, no N addition; +N, N addition. Data are presented as means ±1 SEM. ANOVA P values are reported when P < 0.05Back to article page