Fig. 4: Relationships of GPP to AI in the eight regions (2000–2014).
From: Accelerated dryland expansion regulates future variability in dryland gross primary production
The solid curves denote the fitted relations between gross primary production (GPP) and aridity index (AI) in the eight dryland regions, and the upper and lower dashed curves denote the 95% confidence intervals of the fitted relations. The shaded areas denote one standard deviation. The vertical dashed lines delineate the boundaries between the four dryland subtypes.
