图2. 不同处理下土壤有机碳(SOC)含量的差异 误差棒代表平均值的标准误差。不同小写字母表示不同处理在P<0.05水平上的差异显著
Fig. 2. Difference of SOC content under different treatments Error bars represent standard errors of the mean values. Different lowercase letters indicate significant difference between different treatments at P<0.05