Soil Drought and Vegetation Response during 2001–2015 in North China Based on GLDAS and MODIS Data

Table 1

The correlation coefficient between SMAI and SPEI in North China.

Correlation coefficient	SPEI-1	SPEI-3	SPEI-6	SPEI-9	SPEI-12
SMAI-1	0.51	0.85	0.74	0.63	0.59
SMAI-2	0.21	0.49	0.68	0.80	0.84
SMAI-3	0.06	0.28	0.52	0.73	0.83
SMAI-4	0.09	0.22	0.44	0.63	0.76

Note: r in bold indicates that it reached a significance level of α = 0.01.