Fig. 1. Map of elevation and land cover types in the YRB

Fig. 2. The flowchart of this study

Fig. 3. Temporal characteristics of SPEI at different time scales in the YRB from 2001 to 2020

Fig. 4. Inter-annual variation of annual， spring， summer and autumn SPEI in the YRB from 2001 to 2020

Fig. 5. Spatial characteristics of annual，spring，summer and autumn SPEI trends of significance in the YRB from 2001 to 2020

Fig. 6. The spatial distribution of maximum correlation coefficient for SPEI-NDVI and SPEI-SIF

Fig. 7. Drought impact the degree of different vegetation types in the YRB

Fig. 8. Spatial distributions of VRT_N and VRT_S in the YRB

Fig. 9. SPEI-NDVI of WTC and PWC after removing the impacts of PDO，ENSO， and sunspots

Fig. 10. SPEI-SIF of WTC and PWC after removing the impacts of PDO，ENSO， and sunspots