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SOC, TN contents, and SOC/TN of different-sized aggregates at 0-cm to 20-cm soil depth in alfalfa plantations with different planting durations. Different letters indicate significant differences among different planting durations for the same-sized aggregate at the 0.05 level. The values are mean + SE (error bar). CK, abandoned farmland. 5-Y, 8-Y, 10-Y, 15-Y, and 20-Y represent planting variations for 5, 8, 10, 15, and 20 years, respectively.
