Meteorological Drought, Hydrological Drought, and NDVI in the Heihe River Basin, Northwest China: Evolution and Propagation

Figure 12

Heat map showing growing season Pearson’s correlation coefficients between VCI and different timescale of SPI, VCI, and different timescale of SDI for the period of 1999–2012 in the UHRB (Ylx). (a) (PC ≥ 0.53, p < 0.05), (b) (PC ≥ 0.55 or ≤ −0.69, p < 0.01) and MHRB (Zyx), (c) (PC ≥ 0.55, p < 0.05), and (d) (PC ≥ 0.54, p < 0.05).

(a)

(b)

(c)

(d)