Analysis of Drought Characteristics in Xilingol Grassland of Northern China Based on SPEI and Its Impact on Vegetation

Table 2

Pearson correlation coefficients between SPEI and NDVI at different time scales.

	SPEI-1	SPEI-3	SPEI-6	SPEI-12
Xilingol	0.72	0.76	0.83	0.64
Meadow steppe	0.48	0.53	0.64	0.53
Typical steppe	0.69	0.73	0.79	0.61
Steppe desert	0.62	0.65	0.79	0.71
Desert steppe	0.66	0.69	0.65	0.44