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’.