2.2 Environmental variables
The World Climate Database (http://www.worldclim.org/) was used to
download current (1970-2000) and future climate data (2050: 2041-2060,
2070: 2061-2080), including 19 bioclimatic variables with a resolution
of 2.5’. Future climate data (2050: 2041-2060, 2070: 2061-2080) were
carried out by the BCC-CSM2-MR climate system model, which the National
Climate Center developed (Zhou et al., 2021). New future pathways based
on socioeconomic assumptions are called shared socioeconomic pathways
(SSPs), which describe the various levels of socioeconomic development
used in the study (Riahi et al., 2017). The SSPs include the
high-forcing scenario (SSP5-8.5), medium-forcing scenario (SSP2-4.5),
and low-forcing scenario (SSP1-2.6). High and low emission scenarios
were represented by SSP5-8.5 and SSP1-2.6 in the study, respectively.
Topographic parameters (altitude, slope, and aspect) were downloaded
from World Climate data (http://www.worldclim.org/) with a
resolution of 2.5’.