Figure 5
From: Spatial variations and controls of carbon use efficiency in China’s terrestrial ecosystems
Relationships between CUE and soil factors across the whole region (a–c) and in individual ecosystem types (forest: d–f; grassland: g–i; cropland: j–l). SOC, soil organic content. The circles and error bars represent the mean ± standard deviation at intervals of 2.5% Clay, 0.25% SOC and 0.2 pH, respectively. *, **, and *** indicate that the regression equation was significant at the 0.05, 0.01 and 0.001 levels, respectively. The dotted line indicates that the regression equation was not significant at the 0.05 level.
