Figure 3. Enhancement of soil water content for elevated CO₂ levels (A) under different management systems; (B) under different vegetation types; and (C) under different soil texture; and (D) using results from different soil water content (SWC) measurement methods (volumetric method, gravimetric method, etc., Extended Table 1).

The number of cases is shown in brackets. Error bars are bootstrapped confidence intervals (CI). All the statistics are not significant at P > 0.05.