Figure 1: Interannual variations in anomalies of total NPP and average SPEI. | Scientific Reports

Figure 1: Interannual variations in anomalies of total NPP and average SPEI.

From: Drought dominates the interannual variability in global terrestrial net primary production by controlling semi-arid ecosystems

Figure 1

(a) Relationships between annual NPP and annual SPEI in both hemispheres. (b) Correlation coefficients (Pearson coefficient, R) between annual NPP and 12- to 24-month SPEI. (c) Relationship between annual NPP and 19-month SPEI in the Northern Hemisphere. (d) Relationship between annual NPP and 16-month SPEI in the Southern Hemisphere. **Denotes 95% confidence level estimated with a t-test; ***denotes 99% confidence level estimated with a t-test.

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