Figure 3
From: Extreme climatic events down-regulate the grassland biomass response to elevated carbon dioxide
ES changes under different environmental conditions. The ES changes (compared to the previous year) were classified into two groups according to the occurrence of ECEs. (a), (c) show the results for the total biomass, for H1 and H2 respectively; while (b), (d) show the results for the grass biomass. The dashed line in each sub-figure is the zero line. The two groups in each figure are well separated. By applying student′s t-test (two sided), the differences are statistically significant with p = 0.01,0.007,0.04, and 0.002 for the sub-figures from (a–d), respectively.
