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. 2011 Jan 10;108(4):1240–1245. doi: 10.1073/pnas.1014425108

Fig. 3.

Fig. 3.

Spatial distribution of spring (April and May) NDVI change and temperature change during different periods in North America according to TP of spring NDVI. (A) The year corresponding to the turning point (TP) of spring NDVI trend estimated by the piecewise linear regression approach (B) spring NDVI trend before the TP of spring NDVI trend, (C) spring NDVI trend after the TP of spring NDVI trend, (D) spring temperature trend before the TP of spring NDVI trend, and (E) spring temperature trend after the TP of spring NDVI trend. The insets show the frequency distributions of corresponding trends. White grids in A show area with insignificant (P > 0.10) TP.