Figure 5: Latitudinal distributions of r and slope for the relationships between GPP_max and climatic factors.

(a,d) GPP_max v.s. summer temperature (mean temperature in June-July-August). (b,e) GPP_max v.s. summer precipitation (mean monthly precipitation in June-July-August). (c,f) GPP_max v.s. summer solar radiation (mean solar radiation in June-July-August).