3.2 Environmental factors affecting the distribution of T. chinense
After screening, the 11 environmental factors were used to establish the model and their importance were shown in Table S5. Among them, Bio18 (precipitation of warmest quarter) is the most important environmental factor, followed by Bio11 (mean temperature of coldest quarter) and Bio08 (mean temperature of wettest quarter). These three factors are the main environmental factors that affect the distribution of T. chinense . The suitable range of main environmental factors in the current suitable area of T. chinense was shown in Table S6. Specifically, the suitable range of Bio18 is 188.98 mm ~ 763.52 mm. The suitable value distribution of Bio11 was -26.47℃ to 13.22℃. The lowest suitable value for Bio08 was 9.08℃, and the highest value was 26.38℃. In the future climate scenario, the value ranges of Bio18, Bio11, and Bio08 show an increasing trend in the current suitable area. With the increase of carbon emission concentration, the increase rate will increase year by year (Table S6). It is expected that under the climate scenario combination of 2090s-SSP5-8.5, Bio11 and Bio08 will rise to the highest level, with an increase of 6.32℃ and 6.24℃ compared with the current climate scenario. The highest value of Bio18 appears in the 2090s-SSP1-2.6 climate scenario combination, increasing by approximately 36.10 mm (Figure 3).