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

Figure 7

Monthly variations in mean NDVI and SPEI in growing season (April to October) of 2001, 2003, 2007, and 2012 and the 2000–2015 average in Xilingol. The dashed and solid lines denote the 16 years’ mean and monthly NDVI or SPEI, respectively.