Table 5 Relevant parameters and sources of the auxiliary data.

Soil type (ST)

1 km

https://www.resdc.cn/

DEM

90 m

http://www.gscloud.cn/#page1/2

Slope (S)

90 m

http://www.gscloud.cn/#page1/2

Slope aspect (SP)

90 m

http://www.gscloud.cn/#page1/2

Drought index (DI)

Yearly

0.05

http://climexp.knmi.nl/selectfield_obs2.cgi?id=someone@somewhere

Lithology (L)

Shp

http://www.karstdata.cn/

Population (POP)

1 km

https://www.worldpop.org/geodata/listing?id=64

Precipitation (P)

Monthly

1 km

http://data.cma.cn/