Figure 2

Variation in TN (A), TP (B), SOC (C), and C/N (D) in mounds of different ages. TN, TP, SOC, and C/N represent soil total nitrogen, soil total phosphorus, soil organic carbon, and ratio of soil total nitrogen to organic carbon, respectively. Uppercase (grazing) and lowercase (non-grazing) letters represent significant differences by mound age at P < 0.05; * represents a significant difference between grazing and non-grazing sites at P < 0.05 for the same mound age. Bars and errors represent the mean and standard error.