Figure 3. Seasonal dynamics of soil net N mineralization rate (NMR) at 15 cm depth under warming (1.8°C) and N addition (10 g m−2 yr−1) treatments in temperate grassland of northeastern China.
Values show the monthly means of soil NMR from May to October in three years. Vertical bars indicate standard errors of means (n = 6). Difference lowercase letters indicate statistically significant differences (P<0.05). *, ** represent significant at P<0.05 and P<0.01. See Figure 1 for abbreviations.